JPH07201490A - X-ray diagnostic device - Google Patents
X-ray diagnostic deviceInfo
- Publication number
- JPH07201490A JPH07201490A JP5353473A JP35347393A JPH07201490A JP H07201490 A JPH07201490 A JP H07201490A JP 5353473 A JP5353473 A JP 5353473A JP 35347393 A JP35347393 A JP 35347393A JP H07201490 A JPH07201490 A JP H07201490A
- Authority
- JP
- Japan
- Prior art keywords
- ray
- electric signal
- exposure amount
- signal
- ray exposure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 185
- 238000006243 chemical reaction Methods 0.000 claims description 41
- 230000003287 optical effect Effects 0.000 claims description 27
- 230000005611 electricity Effects 0.000 claims 2
- 230000015654 memory Effects 0.000 description 25
- 238000010586 diagram Methods 0.000 description 11
- 230000000295 complement effect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- X-Ray Techniques (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、Ｘ線露光量を適性に制
御できるＸ線診断装置に係わり、特に、Ｘ線を光信号に
変換後、その光信号を電気信号に変換する光−電気変換
手段の一部の画素の電気信号値に基づき、Ｘ線露光量を
適性に制御するＸ線診断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus capable of appropriately controlling an X-ray exposure amount, and more particularly to an opto-electrical apparatus for converting an X-ray into an optical signal and then converting the optical signal into an electric signal. The present invention relates to an X-ray diagnostic apparatus that appropriately controls an X-ray exposure amount based on electric signal values of some pixels of a conversion unit.
【０００２】[0002]
【従来の技術】従来より、Ｘ線診断装置は、例えば図１
０に示すＸ線診断装置１０１のようにＸ線を発生するＸ
線管１０３と、このＸ線管１０３から発生し、被検体を
通過したＸ線を収集するフィルム／スクリーン１０５
と、このフィルム／スクリーン１０５の前面に設けら
れ、Ｘ線露光量を検出する採光器１０７と、この採光器
１０７の検出結果に基づいて前記Ｘ線管１０３のＸ線露
光量を制御するＸ線制御器１０９とを備えるものが知ら
れている。2. Description of the Related Art Conventionally, an X-ray diagnostic apparatus is shown in FIG.
X that generates X-rays like the X-ray diagnostic apparatus 101 shown in FIG.
X-ray tube 103 and film / screen 105 for collecting X-rays generated from the X-ray tube 103 and passing through the subject
And a light collector 107 provided on the front surface of the film / screen 105 for detecting the X-ray exposure amount, and an X-ray for controlling the X-ray exposure amount of the X-ray tube 103 based on the detection result of the light collector 107. A device including a controller 109 is known.
【０００３】また、図１１に示すＸ線診断装置１２１よ
うにＸ線管１０３と、このＸ線管１０３から発生し、被
検体を通過したＸ線を収集してＸ線を可視光に変換する
イメージインテンシファイア１１１と、イメージインテ
ンシファイア１１１によって変換された可視光を集光す
るレンズ１１３と、イメージインテンシファイア１１１
によって変換された可視光を電気信号に変換してＸ線画
像を表示する画像出力部（図示せず）に出力する撮像カ
メラ１１５と、イメージインテンシファイア１１１と撮
像カメラ１１５の間に設けられ前記イメージインテンシ
ファイア１１１によって変換された可視光をミラー１１
７によって分光して可視光の量を検出する光検出器１１
９と、この光検出器１１９の検出結果に基づいて前記Ｘ
線管のＸ線露光量を制御するＸ線制御器１０９とを備え
るものも知られている。Further, an X-ray tube 103 and an X-ray generated from the X-ray tube 103 and passing through a subject are collected to convert the X-rays into visible light as in an X-ray diagnostic apparatus 121 shown in FIG. An image intensifier 111, a lens 113 that collects visible light converted by the image intensifier 111, and an image intensifier 111.
The image pickup camera 115 that converts the visible light converted by the above into an electric signal and outputs the electric signal to an image output unit (not shown) that displays an X-ray image, and is provided between the image intensifier 111 and the image pickup camera 115. Visible light converted by the image intensifier 111 is mirror 11
A photodetector 11 that detects the amount of visible light by being dispersed by 7
9 and the above X based on the detection result of this photodetector 119.
It is also known to include an X-ray controller 109 that controls the X-ray exposure amount of the X-ray tube.
【０００４】これらの例では、採光器１０７や光検出器
１１９を用いてＸ線露光量を検出し、その結果に基づい
てＸ線露光量を制御している。In these examples, the X-ray exposure amount is detected by using the light collector 107 and the photodetector 119, and the X-ray exposure amount is controlled based on the result.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
採光器１０７によるＸ線露光量の検出方法では、採光器
１０７がＸ線を一部吸収するため、Ｘ線の利用率が低下
するという問題がある。また、採光器１０７の陰が画像
に写し込まれるという問題も生じる。However, in the conventional method of detecting the X-ray exposure amount by the daylight collector 107, the daylight collector 107 partially absorbs the X-rays, so that there is a problem that the utilization rate of the X-rays decreases. is there. There is also a problem that the shade of the daylight collector 107 is imprinted on the image.
【０００６】一方従来の光検出器１１９によるＸ線露光
量の検出方法では、図１２に示すようにイメージインテ
ンシファイア１１１と撮像カメラ１１５が無く、Ｘ線を
可視光に変換するＸ線−光信号変換手段１２３と、可視
光を電気信号に変換し、Ｘ線画像を表示する画像出力部
（図示せず）にその電気信号を出力する光−電気信号変
換手段１２５が密着しているようなＸ線診断装置１２７
では、光検出器１１９を設けることができないという問
題がある。On the other hand, in the conventional method of detecting the amount of X-ray exposure by the photodetector 119, there is no image intensifier 111 and imaging camera 115 as shown in FIG. 12, and X-ray-light for converting X-rays into visible light is used. The signal conversion unit 123 and the optical-electrical signal conversion unit 125 that converts visible light into an electric signal and outputs the electric signal to an image output unit (not shown) that displays an X-ray image are in close contact with each other. X-ray diagnostic apparatus 127
Then, there is a problem that the photodetector 119 cannot be provided.
【０００７】本発明は上記事情に鑑みて成されたもので
あり、その目的は、Ｘ線を可視光に変換するＸ線−光信
号変換手段と、可視光を電気信号に変換する光−電気信
号変換手段が密着しているような場合であってもＸ線露
光量を適性に制御することが可能なＸ線診断装置を提供
することにある。The present invention has been made in view of the above circumstances, and an object thereof is an X-ray-optical signal converting means for converting X-rays into visible light and an opto-electrical device for converting visible light into an electric signal. An object of the present invention is to provide an X-ray diagnostic apparatus capable of appropriately controlling the X-ray exposure amount even when the signal conversion unit is in close contact.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
めに本発明は、Ｘ線を光信号に変換するＸ線−光信号変
換手段と、このＸ線−光信号変換手段により変換された
光信号を複数の画素により撮像して電気信号に変換する
光−電気変換手段とを備えるＸ線診断装置において、前
記光−電気信号変換手段の一部の画素の電気信号値によ
ってＸ線露光量の制御を行うＸ線露光量制御手段を具備
することを特徴としている。In order to achieve the above object, the present invention has an X-ray-optical signal converting means for converting an X-ray into an optical signal, and the X-ray-optical signal converting means. In an X-ray diagnostic apparatus including an optical-electrical conversion unit that captures an optical signal with a plurality of pixels and converts the optical signal into an electric signal, an X-ray exposure amount according to an electric signal value of some pixels of the optical-electrical signal conversion unit It is characterized by comprising an X-ray exposure amount control means for controlling the above.
【０００９】また、Ｘ線を光信号に変換するＸ線−光信
号変換手段と、前記Ｘ線−光信号変換手段によって変換
された光信号を複数の画素によって受光し、受光量に応
じて電気信号を蓄積するとともに、蓄積された電気信号
を読出したとき、電気信号の蓄積を初期値に戻す光−電
気信号変換手段と、前記光−電気信号変換手段の所定画
素をＸ線の露光量を検出するＸ線露光量検出画素とし、
このＸ線露光量検出画素により変換された電気信号を所
定時間間隔で読出し、それを蓄積していく電気信号蓄積
手段と、前記電気信号蓄積手段によって蓄積された電気
信号が予め設定されている所定値より大きくなった場
合、Ｘ線の曝射を停止させる判定手段と、前記電気信号
蓄積手段によりＸ線露光量検出画素の電気信号が読出さ
れたとき、その電気信号をＸ線露光量検出画素毎に加算
して蓄積する電気信号記憶手段と、前記光−電気信号変
換手段から電気信号を読出すことによってＸ線画像を得
るとき、Ｘ線露光量検出画素の電気信号は、前記電気信
号記憶手段から読出し、Ｘ線露光量検出画素以外の画素
の電気信号は、光−電気信号変換手段から読出す切り換
え手段とを具備することを特徴としている。Further, an X-ray-optical signal converting means for converting an X-ray into an optical signal, and an optical signal converted by the X-ray-optical signal converting means are received by a plurality of pixels, and the electric signal is converted into an electric signal according to the amount of received light. The optical-electrical signal converting means for storing the signal and returning the accumulated electric signal to an initial value when the accumulated electric signal is read out, and a predetermined pixel of the optical-electrical signal converting means are exposed to an X-ray exposure amount. X-ray exposure amount detection pixel to be detected,
The electric signal converted by the X-ray exposure amount detection pixel is read at a predetermined time interval, and the electric signal accumulating means for accumulating the electric signal is accumulated, and the electric signal accumulated by the electric signal accumulating means is set in advance. When the electric signal of the X-ray exposure amount detection pixel is read out by the determination means for stopping the X-ray exposure when the value becomes larger than the value and the electric signal storage means, the electric signal is read as the X-ray exposure amount detection pixel. When an X-ray image is obtained by reading the electric signal from the optical-electrical signal converting means and the electric signal storing means for adding and accumulating each of the electric signals, the electric signal of the X-ray exposure amount detecting pixel is stored in the electric signal storing means. It is characterized in that it comprises switching means for reading out from the means and reading out the electric signals of the pixels other than the X-ray exposure amount detecting pixels from the optical-electrical signal converting means.
【００１０】さらに、Ｘ線を光信号に変換するＸ線−光
信号変換手段と、前記Ｘ線−光信号変換手段によって変
換された光信号を複数の画素によって受光し、受光量に
応じて電気信号を蓄積するとともに、蓄積された電気信
号を読出したとき、電気信号の蓄積を初期値に戻す光−
電気信号変換手段と、前記光−電気信号変換手段の互い
に異なる所定数の画素をＸ線の露光量を検出するＸ線露
光量検出画素群とし、予め互いに異なる前記Ｘ線露光量
検出画素群を複数持ち、前記Ｘ線露光量検出画素群の電
気信号を所定時間間隔で順番に読出し、その読出した値
が予め設定されている所定値より大きくなった場合、Ｘ
線の曝射を停止させる判定手段と、前記Ｘ線露光量検出
画素群に蓄積されるべき電気信号を、それまでＸ線露光
量検出画素群が蓄積した電気信号と、Ｘ線露光量検出画
素群となっている画素に隣接する画素の電気信号に基づ
いて換算した電気信号とから演算する電気信号演算手段
と、前記光−電気信号変換手段から電気信号を読出すこ
とによってＸ線画像を得るとき、Ｘ線露光量検出画素の
電気信号は前記電気信号演算手段に演算させたものを読
出し、Ｘ線露光量検出画素以外の画素の電気信号は光−
電気信号変換手段に蓄積されたものを読出す切り換え手
段とを具備することを特徴としている。Further, the X-ray-optical signal converting means for converting the X-ray into an optical signal, and the optical signal converted by the X-ray-optical signal converting means are received by a plurality of pixels, and the electric signals are electrically supplied according to the amount of received light. An optical signal that stores the signal and returns the stored electrical signal to the initial value when the stored electrical signal is read out.
A predetermined number of different pixels of the electric signal conversion means and the optical-electrical signal conversion means are set as X-ray exposure amount detection pixel groups for detecting the exposure amount of X-rays, and the different X-ray exposure amount detection pixel groups are set in advance. If a plurality of pixels are provided and the electric signals of the X-ray exposure amount detection pixel group are sequentially read at predetermined time intervals, and the read values become larger than a preset predetermined value, X
Determining means for stopping the exposure of the X-rays, an electric signal to be accumulated in the X-ray exposure amount detecting pixel group, an electric signal accumulated in the X-ray exposure amount detecting pixel group until then, and an X-ray exposure amount detecting pixel An X-ray image is obtained by reading an electric signal from an electric signal calculating unit that calculates from an electric signal converted based on an electric signal of a pixel adjacent to the group of pixels and the optical-electrical signal converting unit. At this time, the electric signal of the X-ray exposure amount detection pixel is read out by calculating the electric signal calculation means, and the electric signals of the pixels other than the X-ray exposure amount detection pixel are the optical signals.
And a switching means for reading the data stored in the electric signal converting means.
【００１１】[0011]
【作用】上記構成によれば、Ｘ線露光量制御手段は、Ｘ
線を光信号に変換するＸ線−光信号変換手段と、このＸ
線−光信号変換手段により変換された光信号を複数の画
素により撮像して電気信号に変換する光−電気変換手段
とを備えるＸ線診断装置において、前記光−電気信号変
換手段の一部の画素の電気信号値によってＸ線露光量の
制御を行う。According to the above construction, the X-ray exposure amount control means is
X-ray-optical signal conversion means for converting a line into an optical signal, and this X
An X-ray diagnostic apparatus, comprising: an optical-electrical conversion unit that captures an optical signal converted by the line-optical signal conversion unit by a plurality of pixels and converts it into an electrical signal. The X-ray exposure amount is controlled by the electric signal value of the pixel.
【００１２】また、Ｘ線−光信号変換手段は、Ｘ線を光
信号に変換し、光−電気信号変換手段は、前記Ｘ線−光
信号変換手段によって変換された光信号を複数の画素に
よって受光し、受光量に応じて電気信号を蓄積するとと
もに、蓄積された電気信号を読出したとき、電気信号の
蓄積を初期値に戻し、電気信号蓄積手段は、前記光−電
気信号変換手段の所定画素をＸ線の露光量を検出するＸ
線露光量検出画素とし、このＸ線露光量検出画素により
変換された電気信号を所定時間間隔で読出し、それを蓄
積していく。その後、判定手段は、前記電気信号蓄積手
段によって蓄積された電気信号が予め設定されている所
定値より大きくなった場合、Ｘ線の曝射を停止させる。
そのため、特別に光検出器を設けることなくＸ線露光量
を適性に制御することが可能となる。そして、電気信号
記憶手段は、前記電気信号蓄積手段によりＸ線露光量検
出画素の電気信号が読出されたとき、その電気信号をＸ
線露光量検出画素毎に加算して蓄積し、切り換え手段
は、前記光−電気信号変換手段から電気信号を読出すこ
とによってＸ線画像を得るとき、Ｘ線露光量検出画素の
電気信号は、前記電気信号記憶手段から読出し、Ｘ線露
光量検出画素以外の画素の電気信号は、光−電気信号変
換手段から読出す。そのため、光−電気信号変換手段の
一部の画素をＸ線露光量検出画素として用いても、正確
なＸ線画像を得ることができる。Further, the X-ray-optical signal converting means converts the X-ray into an optical signal, and the optical-electrical signal converting means converts the optical signal converted by the X-ray-optical signal converting means into a plurality of pixels. When light is received and an electric signal is accumulated according to the amount of received light, and when the accumulated electric signal is read out, the accumulation of the electric signal is returned to an initial value, and the electric signal accumulating means is a predetermined one of the optical-electrical signal converting means. X for detecting the amount of exposure of pixels to X-rays
The X-ray exposure amount detection pixel is used as a line exposure amount detection pixel, and the electric signal converted by the X-ray exposure amount detection pixel is read at predetermined time intervals and accumulated. Then, when the electric signal accumulated by the electric signal accumulating means becomes larger than a preset predetermined value, the judging means stops the X-ray exposure.
Therefore, the X-ray exposure amount can be appropriately controlled without providing a special photodetector. When the electric signal of the X-ray exposure amount detection pixel is read by the electric signal storage means, the electric signal storage means stores the electric signal as X.
When the X-ray image is obtained by adding and accumulating the line exposure amount detection pixels for each pixel and reading the electric signal from the optical-electrical signal conversion unit, the electric signal of the X-ray exposure amount detection pixel is The electric signals of the pixels other than the X-ray exposure amount detection pixels are read from the electric signal storage means and are read from the optical-electric signal conversion means. Therefore, an accurate X-ray image can be obtained even if some pixels of the optical-electrical signal converting means are used as X-ray exposure amount detection pixels.
【００１３】さらに、判定手段は、前記光−電気信号変
換手段の互いに異なる所定数画素をＸ線の露光量を検出
するＸ線露光量検出画素群とし、予め互いに異なる前記
Ｘ線露光量検出画素群を複数持ち、前記Ｘ線露光量検出
画素群の電気信号を所定時間間隔で順番に読出し、その
読出した値が予め設定されている所定値より大きくなっ
た場合、Ｘ線の曝射を停止させる。そのため、特別に光
検出器を設けることなくＸ線露光量を適性に制御するこ
とが可能となる。その後、電気信号演算手段は、前記Ｘ
線露光量検出画素群に蓄積されるべき電気信号を、それ
までＸ線露光量検出画素群が蓄積した電気信号と、Ｘ線
露光量検出画素群となっている画素に隣接する画素の電
気信号に基づいて換算した電気信号とから演算し、切り
換え手段は、前記光−電気信号変換手段から電気信号を
読出すことによってＸ線画像を得るとき、Ｘ線露光量検
出画素の電気信号は前記電気信号演算手段に演算させた
ものを読出し、Ｘ線露光量検出画素以外の画素の電気信
号は光−電気信号変換手段に蓄積されたものを読出す。
そのため、光−電気信号変換手段の一部の画素をＸ線露
光量検出画素として用いても、電気信号を記憶する記憶
手段を設けることなくＸ線画像を得ることができる。Further, the determining means sets a predetermined number of different pixels of the optical-electrical signal converting means as an X-ray exposure amount detection pixel group for detecting an exposure amount of X-rays, and the X-ray exposure amount detection pixels different from each other in advance. Having a plurality of groups, the electric signals of the X-ray exposure amount detection pixel group are sequentially read at predetermined time intervals, and when the read value becomes larger than a preset predetermined value, X-ray exposure is stopped. Let Therefore, the X-ray exposure amount can be appropriately controlled without providing a special photodetector. After that, the electric signal calculation means sets the X
The electric signals to be accumulated in the line exposure amount detection pixel group are the electric signals accumulated in the X-ray exposure amount detection pixel group until then, and the electric signals of the pixels adjacent to the pixels forming the X-ray exposure amount detection pixel group. When the switching means obtains an X-ray image by reading the electric signal from the optical-electrical signal converting means, the electric signal of the X-ray exposure amount detection pixel is calculated based on the electric signal converted from the electric signal. The signals calculated by the signal calculation means are read out, and the electric signals of the pixels other than the X-ray exposure amount detection pixels are read out from those accumulated in the optical-electrical signal conversion means.
Therefore, even if some pixels of the light-electrical signal converting means are used as the X-ray exposure amount detecting pixels, an X-ray image can be obtained without providing a storage means for storing the electric signal.
【００１４】[0014]
【実施例】図１は、本発明に係るＸ線診断装置の第１実
施例を示す機能ブロック図である。1 is a functional block diagram showing a first embodiment of an X-ray diagnostic apparatus according to the present invention.
【００１５】図１に示すように、第１実施例のＸ線診断
装置１は、Ｘ線管３と、Ｘ線−光信号変換部５と、光−
電気信号変換部７と、信号制御部９と、フォトタイマ部
１１と、Ｘ線制御部１３と、補完・推定処理部１５とを
備えている。As shown in FIG. 1, the X-ray diagnostic apparatus 1 according to the first embodiment has an X-ray tube 3, an X-ray-optical signal conversion section 5, and an optical-beam.
An electric signal converter 7, a signal controller 9, a photo timer 11, an X-ray controller 13, and a complementation / estimation processor 15 are provided.
【００１６】Ｘ線−光信号変換部５は、Ｘ線を発生する
Ｘ線管３から発生して被検体を通過したＸ線を光信号に
変換する例えばシンチレータから成る。The X-ray-optical signal converter 5 is composed of, for example, a scintillator which converts the X-rays generated from the X-ray tube 3 which generates X-rays and passed through the subject into optical signals.
【００１７】光−電気信号変換部７は、Ｘ線−光信号変
換部５により変換された光信号を複数の画素により撮像
し、受光量に対応して電気信号を前記各画素に蓄積す
る。The optical-electrical signal converter 7 images the optical signal converted by the X-ray-optical signal converter 5 by a plurality of pixels, and accumulates an electrical signal in each pixel corresponding to the amount of received light.
【００１８】信号制御部９は、図２に示すように光−電
気信号変換部７の撮像エリアの所定領域中の画素１から
画素５までの５画素をＸ線露光量の検出を行うＸ線露光
量検出画素とし、予めこのＸ線露光量検出画素のアドレ
スを持ち、フォトタイマ部１１の電気信号読出し部１７
に対し、前記Ｘ線露光量検出画素のアドレス指定を行
う。As shown in FIG. 2, the signal control section 9 detects the X-ray exposure amount of five pixels from pixel 1 to pixel 5 in a predetermined area of the image pickup area of the optical-electrical signal conversion section 7. The exposure amount detection pixel has an address of the X-ray exposure amount detection pixel in advance, and the electric signal reading unit 17 of the photo timer unit 11
On the other hand, the X-ray exposure amount detection pixels are addressed.
【００１９】また、信号制御部９は、光−電気信号変換
部７から電気信号を読出すことによってＸ線画像を得る
とき、補完・推定処理部１５に対し、光−電気信号変換
部７から電気信号を読出すか、後述の画像メモリ２７か
ら電気信号を読出すかを指定する。Further, the signal control section 9 reads the electric signal from the optical-electrical signal converting section 7 to obtain an X-ray image, and then, the signal controlling section 9 instructs the complementing / estimating processing section 15 from the optical-electrical signal converting section 7. It is designated whether to read the electric signal or the electric signal from the image memory 27 described later.
【００２０】さらに、信号制御部９は、キーボードから
成る入力部（図示せず）を持ち、オペレータの命令によ
り後述の判定部２５に対し、Ｘ線曝射を停止させるとき
の所定値を設定する。Further, the signal control unit 9 has an input unit (not shown) composed of a keyboard, and sets a predetermined value for stopping the X-ray exposure to a determination unit 25, which will be described later, by an operator's command. .
【００２１】フォトタイマ部１１は図３に示すように、
所定時間間隔をカウントし、光−電気信号変換部７から
前記所定時間間隔でＸ線露光量検出画素の電気信号を信
号制御部９のアドレス指定に従って読出す電気信号読出
し部１７と、予め記憶されている複数の重み係数の中か
ら、信号制御部９からの重み係数選択指令に従って対応
する重み係数を選択し、それを所定時間間隔で読出され
たＸ線露光量検出画素の電気信号に掛けることにより重
みを付けを行う重み付け部１９と、電気信号を蓄積する
メモリ２１に前回蓄積された電気信号と新しく重み付け
された電気信号を加算して蓄積する電気信号蓄積部２３
と、予め設定してある所定値とメモリ２１に蓄積された
電気信号を比較し、メモリ２１に蓄積された電気信号の
方が大きくなったとき、Ｘ線曝射を停止させるＸ線曝射
停止信号をＸ線制御部１３に対して出力する判定部２５
とから成る。As shown in FIG. 3, the photo timer unit 11 has
An electric signal reading unit 17 that counts a predetermined time interval and reads the electric signal of the X-ray exposure amount detection pixel from the light-electric signal conversion unit 7 at the predetermined time interval according to the address designation of the signal control unit 9, and is stored in advance. A corresponding weighting factor is selected from a plurality of weighting factors according to the weighting factor selection command from the signal control unit 9 and multiplied by the electrical signal of the X-ray exposure amount detection pixel read at a predetermined time interval. A weighting unit 19 for weighting the electric signal and an electric signal accumulating unit 23 for accumulating and accumulating the electric signal previously accumulated in the memory 21 for accumulating the electric signal and the newly weighted electric signal.
And comparing a predetermined value set in advance with the electric signal accumulated in the memory 21, and when the electric signal accumulated in the memory 21 becomes larger, the X-ray irradiation stop for stopping the X-ray irradiation Determination unit 25 that outputs a signal to the X-ray control unit 13
It consists of and.
【００２２】なお、重み付け部１９による重み付けは、
Ｘ線露光量が一定箇所だけ多くなるような斑が生じる場
合に前記一定箇所以外の場所に対応するＸ線路光量検出
画素の電気信号に係数の多いものを掛けたり、撮像エリ
アの端部近辺のＸ線路光量検出画素の電気信号に係数の
多いものを掛けたり、また、これらの逆を行い、Ｘ線露
光量が適性に制御できるようにするためのものである。
従って、重み付けを行わなくてもＸ線露光量が適性に制
御できる場合は、重み付けを行わずにＸ線露光量検出画
素の電気信号をそのままメモリ２１に蓄積するようにし
ても良い。The weighting by the weighting unit 19 is
When the X-ray exposure amount increases only at a certain portion, a spot having a large coefficient is applied to the electric signal of the X-ray light amount detection pixel corresponding to a place other than the certain portion, or the electric signal of the pixel near the end of the imaging area is multiplied. This is for multiplying the electric signal of the X-ray light amount detection pixel with a large coefficient and vice versa so that the X-ray exposure amount can be appropriately controlled.
Therefore, if the X-ray exposure amount can be appropriately controlled without weighting, the electric signal of the X-ray exposure amount detection pixel may be stored in the memory 21 as it is without weighting.
【００２３】Ｘ線制御部１３は、フォトタイマ部１１か
らＸ線曝射を停止させるＸ線曝射停止信号が出力された
場合、Ｘ線の曝射を停止させる。When the photo-timer unit 11 outputs an X-ray exposure stop signal for stopping the X-ray exposure, the X-ray control unit 13 stops the X-ray exposure.
【００２４】補完・推定処理部１５は、図４に示すよう
に、Ｘ線露光量検出画素毎に電気信号を蓄積する複数の
画像メモリ２７と、フォトタイマ部１１によりＸ線露光
量検出画素の電気信号が読出されたとき、その電気信号
を対応する画像メモリ２７に蓄積させる電気信号記憶部
２９と、光−電気信号変換部７から電気信号を読出すこ
とによってＸ線画像を得るとき、信号制御部９の指定に
より、Ｘ線露光量検出画素の電気信号は、対応する画像
メモリ２７から読出し、Ｘ線露光量検出画素以外の画素
の電気信号は、光−電気信号変換部７から読出し、それ
らを画面表示する画像出力部（図示せず）に出力する切
り換え部３１とから成る。As shown in FIG. 4, the complementation / estimation processing unit 15 includes a plurality of image memories 27 for accumulating electric signals for each X-ray exposure amount detection pixel, and a photo timer unit 11 for storing X-ray exposure amount detection pixels. When an X-ray image is obtained by reading the electric signal from the electric-signal storage unit 29 that stores the electric signal in the corresponding image memory 27 when the electric signal is read and the optical-electric signal converter 7, The electric signals of the X-ray exposure amount detection pixels are read from the corresponding image memory 27 and the electric signals of pixels other than the X-ray exposure amount detection pixels are read from the optical-electrical signal conversion unit 7 by the designation of the control unit 9. And a switching unit 31 for outputting them to an image output unit (not shown) for displaying them on the screen.
【００２５】次に、第１実施例のＸ線診断装置１の作用
を図５のタイムチャートを用いて説明する。Next, the operation of the X-ray diagnostic apparatus 1 of the first embodiment will be described with reference to the time chart of FIG.
【００２６】予め、図２に示すように光−電気信号変換
部７の撮像エリアの所定領域内の画素１、画素２、画素
３、画素４、画素５をＸ線露光量検出画素として、信号
制御部９に設定しておく。また予め、Ｘ線の曝射を停止
させるときの所定値を信号制御部９から入力し判定部２
５に設定しておく。In advance, as shown in FIG. 2, the signals are set as pixels 1, 2, 3, 3, 4 and 5 within a predetermined area of the image pickup area of the optical-electrical signal converter 7 as X-ray exposure detection pixels. It is set in the control unit 9. Further, a predetermined value for stopping the X-ray exposure is input from the signal control unit 9 in advance, and the determination unit 2
Set to 5.
【００２７】この状態で、Ｘ線管３によるＸ線の曝射が
開始されると、被検体を通過したＸ線がＸ線−光信号変
換部５により光信号に変換される。そして、この変換さ
れた光信号は、光−電気信号変換部７の複数の画素によ
って受光され、その受光量に対応した電気信号が各画素
に蓄積される。When the X-ray irradiation by the X-ray tube 3 is started in this state, the X-rays that have passed through the subject are converted into optical signals by the X-ray-optical signal conversion unit 5. Then, the converted optical signal is received by a plurality of pixels of the optical-electrical signal converter 7, and an electrical signal corresponding to the amount of received light is accumulated in each pixel.
【００２８】そして、図３に示すフォトタイマ部１１の
電気信号読出し部１７は、Ｘ線曝射開始から所定時間経
過した時刻ｔ1 でのＸ線露光量検出画素の電気信号を信
号制御部９のアドレス指定に従ってそれぞれ読出す。Then, the electric signal reading unit 17 of the photo timer unit 11 shown in FIG. 3 outputs the electric signal of the X-ray exposure amount detection pixel at time t 1 when a predetermined time has elapsed from the start of X-ray exposure to the signal control unit 9. Each is read according to the address designation of.
【００２９】各Ｘ線露光量検出画素の電気信号が読出さ
れると、図４に示す補完・推定処理部１５の電気信号記
憶部２９では、その電気信号を対応する画像メモリ２７
にそれぞれ蓄積させる。When the electric signal of each X-ray exposure detection pixel is read, the electric signal storage unit 29 of the complementation / estimation processing unit 15 shown in FIG. 4 stores the electric signal in the corresponding image memory 27.
Accumulate in each.
【００３０】一方、Ｘ線露光量検出画素の電気信号が読
出されると、重み付け部１９では、読出されたＸ線露光
量検出画素の電気信号に予め記憶されている係数を信号
制御部９からの指令に従って掛けることにより重みを付
けを行う。そして、電気信号蓄積部２３は、重み付けさ
れた全電気信号を加算してメモリ２１に蓄積する。On the other hand, when the electric signal of the X-ray exposure amount detection pixel is read, the weighting unit 19 causes the signal control unit 9 to store the coefficient previously stored in the read electric signal of the X-ray exposure amount detection pixel. Weighting is performed by multiplying according to the command of. Then, the electric signal storage unit 23 adds all the weighted electric signals and stores them in the memory 21.
【００３１】電気信号が蓄積されると判定部２５では、
この蓄積された電気信号と、予め設定してある所定値と
を比較する。ここでは、所定値の方が蓄積された電気信
号より大きいので、Ｘ線管３によるＸ線の曝射が継続し
て行われる。When the electric signal is accumulated, the judging section 25
This accumulated electric signal is compared with a preset predetermined value. Here, since the predetermined value is larger than the stored electric signal, X-ray irradiation by the X-ray tube 3 is continuously performed.
【００３２】そして、図３に示すフォトタイマ部１１の
電気信号読出し部１７は、時刻ｔ2でのＸ線露光量検出
画素の電気信号を信号制御部９のアドレス指定に従って
それぞれ読出す。Then, the electric signal reading section 17 of the photo timer section 11 shown in FIG. 3 reads the electric signal of the X-ray exposure amount detection pixel at time t 2 in accordance with the address designation of the signal control section 9.
【００３３】各Ｘ線露光量検出画素の電気信号が読出さ
れると、図４に示す補完・推定処理部１５の電気信号記
憶部２９では、その電気信号を対応する画像メモリ２７
にそれぞれ蓄積させる。When the electric signal of each X-ray exposure amount detection pixel is read, the electric signal storage unit 29 of the complementation / estimation processing unit 15 shown in FIG. 4 stores the electric signal in the corresponding image memory 27.
Accumulate in each.
【００３４】一方、Ｘ線露光量検出画素の電気信号が読
出されると、重み付け部１９では、読出されたＸ線露光
量検出画素の電気信号に予め記憶されている係数を信号
制御部９からの指令に従って掛けることにより重みを付
けを行う。そして、電気信号蓄積部２３は新しく重み付
けされた全電気信号とメモリ２１に蓄積された電気信号
とを加算してメモリ２１に蓄積する。On the other hand, when the electric signal of the X-ray exposure amount detection pixel is read, the weighting unit 19 causes the signal control unit 9 to store the coefficient previously stored in the read electric signal of the X-ray exposure amount detection pixel. Weighting is performed by multiplying according to the command of. Then, the electric signal accumulating unit 23 adds the newly weighted all electric signals and the electric signals accumulated in the memory 21 and accumulates them in the memory 21.
【００３５】電気信号が蓄積されると判定部２５では、
この蓄積された電気信号と、予め設定してある所定値と
を比較する。ここでは、所定値の方が蓄積された電気信
号より大きいので、Ｘ線管３によるＸ線の曝射が継続し
て行われる。When the electric signal is accumulated, the judging section 25
This accumulated electric signal is compared with a preset predetermined value. Here, since the predetermined value is larger than the stored electric signal, X-ray irradiation by the X-ray tube 3 is continuously performed.
【００３６】以後同様に電気信号の蓄積が行わる。そし
て、時刻ｔ6 で判定部２５に設定されている所定値より
蓄積された電気信号が大きくなったとすると、判定部２
５は、Ｘ線制御部１３に対して、Ｘ線曝射停止信号を出
力する。そして、Ｘ線制御部１３ではＸ線管３によるＸ
線の曝射を停止させる。Thereafter, electric signals are similarly stored. Then, at time t 6 , if the accumulated electrical signal becomes larger than the predetermined value set in the determination unit 25, the determination unit 2
Reference numeral 5 outputs an X-ray exposure stop signal to the X-ray controller 13. Then, in the X-ray control unit 13, X by the X-ray tube 3
Stop the line exposure.
【００３７】次に、第１実施例のＸ線診断装置１のＸ線
曝射停止後のＸ線画像を出力するときの作用を説明す
る。Next, the operation of the X-ray diagnostic apparatus 1 of the first embodiment when outputting an X-ray image after the X-ray exposure is stopped will be described.
【００３８】ここで、時刻ｔ6 でＸ線の露光量が所定値
より大きくなりＸ線の曝射が停止したとすると、図４に
示す補完・推定処理部１５の各画像メモリ２７には、時
刻ｔ6 までのＸ線露光量検出画素の電気信号が蓄積され
ている。If the exposure amount of X-rays becomes larger than a predetermined value at the time t 6 and the X-ray exposure is stopped, the image memories 27 of the complementation / estimation processing unit 15 shown in FIG. The electric signals of the X-ray exposure amount detection pixels until time t 6 are accumulated.
【００３９】この状態で、Ｘ線画像を表示する場合、切
り換え部３１は、信号制御部９のアドレス指定により、
Ｘ線露光量検出画素の電気信号は対応する画像メモリ２
７から読出し、Ｘ線露光量検出画素以外の画素の電気信
号は光−電気信号変換部７から読出し、読出した電気信
号を画面上に表示する画像出力部（図示せず）に出力す
る。In this state, when displaying an X-ray image, the switching unit 31 uses the address designation of the signal control unit 9 to
The electric signal of the X-ray exposure detection pixel corresponds to the corresponding image memory 2
7, the electric signals of pixels other than the X-ray exposure amount detection pixels are read from the optical-electrical signal conversion unit 7, and the read electric signals are output to an image output unit (not shown) that is displayed on the screen.
【００４０】これにより、Ｘ線露光量検出画素の電気信
号が補完され、光−電気信号変換部７からそのまま電気
信号を読出して画像出力部に出力したときに生じるＸ線
露光量検出画素部分の画像消失が無くなる。As a result, the electric signal of the X-ray exposure amount detection pixel is complemented, and the electric signal of the X-ray exposure amount detection pixel portion generated when the electric signal is directly read from the optical-electrical signal conversion unit 7 and output to the image output unit. Image disappearance disappears.
【００４１】このように、第１実施例のＸ線診断装置１
は、所定時間間隔毎に予め決められたＸ線露光量検出画
素の電気信号を電気信号読出し部１７により読出し、重
み付け部１９により重み付けし、前回蓄積された電気信
号と新しく得られた電気信号を加算してメモリ２１に蓄
積し、この蓄積された電気信号と判定部２５に予め設定
してある所定値とを比較し、メモリ２１に蓄積された電
気信号の方が大きくなったとき、Ｘ線曝射停止信号をＸ
線制御部１３に対して出力する。そのため、特別に光検
出器を設けることなくＸ線露光量を適性に制御すること
が可能となる。As described above, the X-ray diagnostic apparatus 1 of the first embodiment
Reads the electric signal of the X-ray exposure amount detection pixel determined in advance at every predetermined time interval by the electric signal reading unit 17 and weights it by the weighting unit 19 to calculate the electric signal accumulated last time and the electric signal newly obtained. The accumulated electric signals are added and accumulated in the memory 21, and the accumulated electric signal is compared with a predetermined value preset in the determination unit 25. When the electric signal accumulated in the memory 21 becomes larger, X-ray X for the exposure stop signal
Output to the line control unit 13. Therefore, the X-ray exposure amount can be appropriately controlled without providing a special photodetector.
【００４２】また、フォトタイマ部１１の電気信号読出
し部１７によりＸ線露光量検出画素の電気信号が読出さ
れたとき、電気信号記憶部２９により、その電気信号を
対応する画像メモリ２７に蓄積させ、光−電気信号変換
部７から電気信号を読出すことによってＸ線画像を得る
とき、切り換え部３１により、Ｘ線露光量検出画素の電
気信号は対応する画像メモリ２７から読出し、Ｘ線露光
量検出画素以外の画素の電気信号は光−電気信号変換部
７から読出すようにしている。このため、光−電気信号
変換部７の一部の画素をＸ線露光量検出画素として用い
ても、正確なＸ線画像を得ることができる。When the electric signal reading unit 17 of the photo timer unit 11 reads the electric signal of the X-ray exposure amount detection pixel, the electric signal storage unit 29 stores the electric signal in the corresponding image memory 27. When the X-ray image is obtained by reading the electric signal from the light-electrical signal conversion unit 7, the electric signal of the X-ray exposure amount detection pixel is read from the corresponding image memory 27 by the switching unit 31, and the X-ray exposure amount is read. The electric signals of pixels other than the detection pixels are read out from the optical-electrical signal converter 7. Therefore, an accurate X-ray image can be obtained even if a part of the pixels of the optical-electrical signal converter 7 is used as the X-ray exposure amount detection pixel.
【００４３】なお、第１実施例のＸ線診断装置１は、光
−電気信号変換部７から電気信号を読出すことによって
Ｘ線画像を得るとき、Ｘ線露光量検出画素の電気信号は
対応する画像メモリ２７から読出すようにしているてい
るが、これに限らず、画像メモリ２７を無くし、画像メ
モリ２７への電気信号の蓄積は行わず、Ｘ線露光量検出
画素の電気信号は、そのＸ線露光量検出画素に隣接する
画素の電気信号と同値とするようにしても良い。また、
Ｘ線露光量検出画素の電気信号は、そのＸ線露光量検出
画素に隣接する８近傍、４近傍等の空間フィルターを用
いて求めるようにしても良い。When the X-ray diagnostic apparatus 1 of the first embodiment obtains an X-ray image by reading the electric signal from the optical-electrical signal converter 7, the electric signal of the X-ray exposure amount detection pixel corresponds to it. However, the present invention is not limited to this, the image memory 27 is eliminated, the electrical signal is not stored in the image memory 27, and the electrical signal of the X-ray exposure detection pixel is It may be set to the same value as the electric signal of the pixel adjacent to the X-ray exposure amount detection pixel. Also,
The electric signal of the X-ray exposure amount detection pixel may be obtained by using a spatial filter such as 8 neighborhoods and 4 neighborhoods adjacent to the X-ray exposure dose detection pixel.
【００４４】次に、本発明に係るＸ線診断装置の第２実
施例を図６と図７を参照して説明する。Next, a second embodiment of the X-ray diagnostic apparatus according to the present invention will be described with reference to FIGS. 6 and 7.
【００４５】第２実施例のＸ線診断装置４１は、図１に
示す第１実施例のＸ線診断装置１の信号制御部９を信号
制御部４３に変更し、フォトタイマ部１１をフォトタイ
マ部５１に変更し、補完・推定処理部１５を補完・推定
処理部５７に変更したものである。In the X-ray diagnostic apparatus 41 of the second embodiment, the signal control section 9 of the X-ray diagnostic apparatus 1 of the first embodiment shown in FIG. 1 is changed to a signal control section 43, and the photo timer section 11 is replaced by a photo timer. It is replaced with the unit 51, and the complementation / estimation processing unit 15 is replaced with the complementation / estimation processing unit 57.
【００４６】フォトタイマ部５１は、図６に示すよう
に、図３に示す第１実施例のフォトタイマ部１１のメモ
リ２１を削除し、電気信号読出し部１７の機能を変更し
て電気信号読出し部４５とし、電気信号蓄積部２３を加
算部４７に変更し、判定部２５の機能を変更して判定部
４９としたものである。As shown in FIG. 6, the photo timer unit 51 deletes the memory 21 of the photo timer unit 11 of the first embodiment shown in FIG. 3 and changes the function of the electric signal reading unit 17 to read the electric signal. The electric signal storage unit 23 is changed to the addition unit 47, and the function of the judgment unit 25 is changed to the judgment unit 49.
【００４７】また、補完・推定処理部５７は、図７に示
すように、図４に示す第１実施例の補完・推定処理部１
５の画像メモリ２７と電気信号記憶部２９を削除して電
気信号演算部５３を追加し、切り換え部３１の機能を変
更して切り換え部５５としたものである。なお、図１に
示す第１実施例のＸ線診断装置と同一部材には同一番号
を付して説明は省略する。Further, as shown in FIG. 7, the complementing / estimating processing unit 57 is the complementing / estimating processing unit 1 of the first embodiment shown in FIG.
The image memory 27 and the electric signal storage unit 29 of No. 5 are deleted, an electric signal calculation unit 53 is added, and the function of the switching unit 31 is changed to a switching unit 55. The same members as those of the X-ray diagnostic apparatus according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.
【００４８】信号制御部４３は、図８に示すように、光
−電気信号変換部７中の画素１ａから画素５ａまでの５
つの画素をＸ線露光量検出画素としたＸ線露光量検出画
素群Ａと、同様に画素１ｂから画素５ｂをＸ線露光量検
出画素としたＸ線露光量検出画素群Ｂと、同様に画素１
ｃから画素５ｃをＸ線露光量検出画素としたＸ線露光量
検出画素群Ｃと、同様に画素１ｄから画素５ｄをＸ線露
光量検出画素としたＸ線露光量検出画素群Ｄの各Ｘ線露
光量検出画素のアドレスを各Ｘ線露光量検出画素群に対
応させて予め持ち、フォトタイマ部５１の電気信号読出
し部４５に対し、Ｘ線露光量検出画素群Ａ、Ｘ線露光量
検出画素群Ｂ、Ｘ線露光量検出画素群Ｃ、Ｘ線露光量検
出画素群Ｄの順番で各Ｘ線露光量検出画素のアドレス指
定を行う。As shown in FIG. 8, the signal control section 43 includes 5 pixels from the pixel 1a to the pixel 5a in the optical-electrical signal converting section 7.
An X-ray exposure amount detection pixel group A in which one pixel is an X-ray exposure amount detection pixel, an X-ray exposure amount detection pixel group B in which pixels 1b to 5b are similarly X-ray exposure amount detection pixels, and a pixel in the same manner 1
Each X of the X-ray exposure amount detection pixel group C in which the pixels 5c to 5c are the X-ray exposure amount detection pixels, and the X-ray exposure amount detection pixel group D in which the pixels 1d to 5d are also the X-ray exposure amount detection pixels The X-ray exposure amount detection pixel group A and the X-ray exposure amount detection are provided in advance to the electric signal reading unit 45 of the photo timer unit 51 by having the address of the X-ray exposure amount detection pixel in association with each X-ray exposure amount detection pixel group. Addressing of each X-ray exposure amount detection pixel is performed in the order of the pixel group B, the X-ray exposure amount detection pixel group C, and the X-ray exposure amount detection pixel group D.
【００４９】なお、Ｘ線露光量検出画素群は、ここでは
４つとしたが、Ｘ線露光量検出の時間間隔と、Ｘ線曝射
の最長時間とから計算される実際に起こり得るＸ線露光
量検出回数に十分に足り得る数とする。Although the number of X-ray exposure amount detection pixel groups is four here, the X-ray exposure amount that can actually occur is calculated from the time interval of X-ray exposure amount detection and the maximum time of X-ray exposure. The number should be enough to detect the quantity.
【００５０】また、信号制御部４３は、光−電気信号変
換部７から電気信号を読出すことによってＸ線画像を得
るとき、補完・推定処理部５７に対し、光−電気信号変
換部７から電気信号を読出すか、後述の電気信号演算部
５３から電気信号を読出すかを指定する。Further, when the signal control section 43 obtains an X-ray image by reading the electric signal from the optical-electrical signal converting section 7, the signal controlling section 43 instructs the complementation / estimation processing section 57 from the optical-electrical signal converting section 7. It is designated whether to read the electric signal or to read the electric signal from the electric signal calculation unit 53 described later.
【００５１】さらに、信号制御部４３は、キーボードか
らなる入力部（図示せず）を持ち、オペレータの命令に
より後述の判定部４９に対し、Ｘ線曝射を停止させると
きの所定値を設定する。Further, the signal control unit 43 has an input unit (not shown) composed of a keyboard, and sets a predetermined value for stopping the X-ray exposure to a determination unit 49, which will be described later, according to a command from an operator. .
【００５２】図６に示すフォトタイマ部５１の電気信号
読出し部４５は、所定時間間隔をカウントし、この所定
時間間隔でＸ線露光量検出画素群Ａから順番に、対応す
るＸ線露光量検出画素の電気信号を信号制御部４３のア
ドレス指定に従って光−電気信号読出部から読出す。The electric signal reading unit 45 of the photo timer unit 51 shown in FIG. 6 counts a predetermined time interval, and at the predetermined time interval, the corresponding X-ray exposure amount detection is performed in order from the X-ray exposure amount detection pixel group A. The electrical signal of the pixel is read from the optical-electrical signal reading unit according to the address designation of the signal control unit 43.
【００５３】加算部４７は、電気信号読出し部４５によ
り読出され、重み付け部１９により重み付けされたＸ線
露光量検出画素群の各電気信号をＸ線露光量検出画素群
毎に加算する。The addition section 47 adds the respective electric signals of the X-ray exposure amount detection pixel group read by the electric signal reading section 45 and weighted by the weighting section 19 for each X-ray exposure amount detection pixel group.
【００５４】判定部４９は、電気信号読出し部４５によ
り読出され、重み付け部１９により重み付けされた各Ｘ
線露光量検出画素の電気信号を加算した値が予め設定し
てある所定値より多くなったとき、Ｘ線曝射停止信号を
Ｘ線制御部１３に対して出力する。The determination section 49 is read by the electric signal reading section 45 and weighted by the weighting section 19 for each X.
When the value obtained by adding the electrical signals of the line exposure amount detection pixels becomes larger than a preset predetermined value, an X-ray exposure stop signal is output to the X-ray controller 13.
【００５５】図７に示す補完・推定処理部５７の電気信
号演算部５３は、Ｘ線露光量検出画素の電気信号を光−
電気信号変換部７にそれまで蓄積された電気信号と、Ｘ
線露光量検出画素となっている画素に隣接する画素の電
気信号に基づいて計算された電気信号とから演算する。The electric signal calculation unit 53 of the complementation / estimation processing unit 57 shown in FIG. 7 optically outputs the electric signal of the X-ray exposure amount detection pixel.
The electric signal accumulated until then in the electric signal converter 7 and X
It is calculated from the electric signal calculated based on the electric signal of the pixel adjacent to the pixel which is the line exposure amount detection pixel.
【００５６】切り換え部５５は、光−電気信号変換部７
から電気信号を読出すことによってＸ線画像を得ると
き、Ｘ線露光量検出画素は、電気信号演算部５３に演算
させた電気信号を読出し、Ｘ線露光量検出画素以外の画
素は、光−電気信号変換部７に蓄積された電気信号を読
出す。The switching section 55 includes the optical-electrical signal converting section 7
When an X-ray image is obtained by reading the electric signal from the X-ray exposure amount detection pixel, the X-ray exposure amount detection pixel reads the electric signal calculated by the electric signal calculation unit 53, and the pixels other than the X-ray exposure amount detection pixel are light-exposed. The electric signal stored in the electric signal converter 7 is read.
【００５７】次に、第２実施例の作用を図９のタイムチ
ャートを用いて説明する。Next, the operation of the second embodiment will be described with reference to the time chart of FIG.
【００５８】予め、Ｘ線露光量検出の時間間隔と、Ｘ線
曝射の最長時間とから計算される実際に起こり得るＸ線
露光量検出回数に十分に足り得るＸ線露光量検出画素群
のアドレスを信号制御部４３に設定しておく。ここで
は、４つのＸ線露光量検出画素群を設定しておく。また
予め、Ｘ線の曝射を停止させるときの所定値を信号制御
部９から入力し判定部４９に設定しておく。The number of pixels of the X-ray exposure amount detection pixel group, which is sufficiently sufficient for the number of X-ray exposure amount detection times that can actually occur, calculated in advance from the time interval of X-ray exposure amount detection and the maximum time of X-ray exposure. The address is set in the signal control unit 43 in advance. Here, four X-ray exposure amount detection pixel groups are set. In addition, a predetermined value for stopping the X-ray exposure is input from the signal control unit 9 and set in the determination unit 49 in advance.
【００５９】この状態で、Ｘ線管３によるＸ線の曝射が
開始されると、被検体を通過したＸ線がＸ線−光信号変
換部５により光信号に変換される。そして、この変換さ
れた光信号は、光−電気信号変換部７の複数の画素によ
って受光され、その受光量に対応した電気信号が各画素
に蓄積される。When the X-ray irradiation by the X-ray tube 3 is started in this state, the X-rays that have passed through the subject are converted into optical signals by the X-ray-optical signal conversion unit 5. Then, the converted optical signal is received by a plurality of pixels of the optical-electrical signal converter 7, and an electrical signal corresponding to the amount of received light is accumulated in each pixel.
【００６０】そして、図６に示すフォトタイマ部５１の
電気信号読出し部４５は、Ｘ線曝射開始から所定時間経
過した時刻ｔ1 でのＸ線露光量検出群Ａの各電気信号を
信号制御部４３のアドレス指定に従ってそれぞれ読出
す。The electric signal reading unit 45 of the photo timer unit 51 shown in FIG. 6 signal-controls each electric signal of the X-ray exposure amount detection group A at time t 1 when a predetermined time has elapsed from the start of X-ray exposure. Each is read according to the address designation of the section 43.
【００６１】Ｘ線露光量検出画素群Ａの各電気信号が読
出されると、重み付け部１９では、予め記憶されている
複数の重み係数の中から、信号制御部９からの重み係数
選択指令に従って対応する重み係数を選択し、それを読
出されたＸ線露光量検出画素の電気信号に掛けることに
より重みを付けを行う。そして、加算部４７は、重み付
けされたＸ線露光量検出画素群Ａの各電気信号を加算す
る。When each electric signal of the X-ray exposure amount detection pixel group A is read out, the weighting unit 19 follows a weighting factor selection command from the signal control unit 9 from a plurality of prestored weighting factors. Weighting is performed by selecting a corresponding weighting factor and multiplying it by the read electrical signal of the X-ray exposure amount detection pixel. Then, the addition unit 47 adds the weighted electric signals of the X-ray exposure amount detection pixel group A.
【００６２】Ｘ線露光量検出画素群Ａの各電気信号が加
算されると判定部４９では、この加算された電気信号
と、予め設定してある所定値とを比較する。ここでは、
所定値の方が加算された電気信号より大きいので、Ｘ線
管３によるＸ線の曝射が継続して行われる。When the respective electric signals of the X-ray exposure amount detection pixel group A are added, the judging section 49 compares the added electric signals with a preset predetermined value. here,
Since the predetermined value is larger than the added electric signal, the X-ray irradiation by the X-ray tube 3 is continued.
【００６３】以後同様に、時刻ｔ2 でＸ線露光量検出画
素群Ｂの各電気信号を読出し、重み付けして加算した値
と所定値とが比較され、時刻ｔ3 でＸ線露光量検出画素
群Ｃの各電気信号を読出し、重み付けして加算した値と
所定値とが比較される。ここでは、いずれも所定値の方
が加算された電気信号より大きいので、Ｘ線管３による
Ｘ線の曝射が継続して行われる。Similarly, at time t 2 , each electric signal of the X-ray exposure amount detection pixel group B is read out, and the weighted and added value is compared with a predetermined value. At time t 3 , the X-ray exposure amount detection pixel is detected. Each electric signal of the group C is read out, and a value obtained by weighting and adding is compared with a predetermined value. Here, since the predetermined value is larger than the added electric signal in each case, the X-ray irradiation by the X-ray tube 3 is continuously performed.
【００６４】そして、時刻ｔ4 でＸ線露光量検出画素群
Ｄの各電気信号を読出し、重み付けして加算した値と所
定値とを比較した結果が所定値より大きくなったとする
と、判定部４９は、Ｘ線制御部１３に対してＸ線曝射停
止信号を出力する。そして、Ｘ線制御部１３ではＸ線管
３によるＸ線の曝射を停止させる。Then, at time t 4 , each electric signal of the X-ray exposure amount detection pixel group D is read out, and it is assumed that the result of comparing the weighted and added value with the predetermined value is larger than the predetermined value. Outputs an X-ray exposure stop signal to the X-ray controller 13. Then, the X-ray controller 13 stops the X-ray irradiation by the X-ray tube 3.
【００６５】次に、第２実施例のＸ線診断装置のＸ線曝
射停止後のＸ線画像を出力するときの作用を説明する。Next, the operation of the X-ray diagnostic apparatus according to the second embodiment when outputting an X-ray image after stopping the X-ray exposure will be described.
【００６６】このとき、時刻ｔ4 でＸ線の露光量が所定
値より大きくなりＸ線の曝射が停止したとすると、Ｘ線
露光量検出画素群Ａの各Ｘ線露光量検出画素では、時刻
ｔ1での電気信号の読出しにより蓄積された電気信号が
一端０になるので、時刻ｔ1〜ｔ4 間のみの電気信号ｖ
aiが蓄積されている。そのため、図７に示す補完・推定
処理部５７の電気信号演算部５３では、時刻ｔ0 〜ｔ1
間で蓄積されるべき電気信号を各Ｘ線露光量検出画素に
隣接する各画素の時刻ｔ0 〜ｔ4 間の電気信号の加算値
ｖai p に基づいて推定し、本来Ｘ線露光量検出画素群Ａ
が時刻ｔ4 で蓄積されるべき電気信号ｖai trueを次式に
より演算する。At this time, if the X-ray exposure amount becomes larger than a predetermined value at the time t 4 and the X-ray exposure is stopped, in each X-ray exposure amount detection pixel of the X-ray exposure amount detection pixel group A, Since the electric signal accumulated by the reading of the electric signal at the time t 1 becomes 0 once, the electric signal v only during the time t 1 to t 4
ai is accumulated. Therefore, in the electric signal calculation unit 53 of the complementation / estimation processing unit 57 shown in FIG. 7, the time t 0 to t 1
An electrical signal to be accumulated estimated based on the addition value v ai p of the electrical signal between time t 0 ~t 4 of each pixel adjacent to the X-ray exposure amount detection pixels between originally X-ray exposure amount detection Pixel group A
Calculates the electrical signal v ai true that should be accumulated at time t 4 by the following equation.
【００６７】ｖai true＝ｖai＋（ｔ1 ／ｔ4 ）ｖai p なお、本来Ｘ線露光量検出画素群Ａが時刻ｔ4 で蓄積さ
れるべき電気信号ｖai trueは、Ｘ線露光量検出画素群Ａ
の各Ｘ線露光量検出画素に蓄積されている時刻ｔ1 〜ｔ
4 間の電気信号ｖaiから次式によっても求めることがで
きる。V ai true = v ai + (t 1 / t 4 ) v ai p Note that the electrical signal v ai true that should originally be accumulated by the X-ray exposure amount detection pixel group A at time t 4 is the X-ray exposure. Quantity detection pixel group A
Time t 1 to t accumulated in each X-ray exposure amount detection pixel of
It can also be obtained from the electrical signal v ai between 4 by the following equation.
【００６８】ｖai true＝ｖai（ｔ4 ／（ｔ4 −ｔ1 ）） しかし、Ｘ線露光量検出画素群Ｄの各Ｘ線露光量検出画
素の電気信号は、時刻ｔ4 で電気信号を読出したときに
０となり、電気信号が蓄積されていないので、Ｘ線露光
量検出画素群Ｄの各Ｘ線露光量検出画素に蓄積されてい
る電気信号から演算することはできない。そのためここ
では、Ｘ線露光量検出画素群の各電気信号は、それまで
Ｘ線露光量検出画素群が蓄積した電気信号と、Ｘ線露光
量検出画素群となっている画素に隣接する画素の電気信
号に基づいて換算した電気信号とから計算している。な
お、Ｘ線露光量検出画素群Ｄのみ各Ｘ線露光量検出画素
に隣接する各画素に蓄積された電気信号の加算値に基づ
いて本来Ｘ線露光量検出画素群Ｄに時刻ｔ4 で蓄積され
るべき電気信号を計算するようにしても良い。V ai true = v ai (t 4 / (t 4 −t 1 )) However, the electric signal of each X-ray exposure amount detection pixel of the X-ray exposure amount detection pixel group D is an electric signal at time t 4. Is 0 when read out, and no electric signal is stored, so it cannot be calculated from the electric signal stored in each X-ray exposure amount detection pixel of the X-ray exposure amount detection pixel group D. Therefore, here, the electric signals of the X-ray exposure amount detection pixel group are the electric signals accumulated by the X-ray exposure amount detection pixel group until then, and the pixels adjacent to the pixel which is the X-ray exposure amount detection pixel group. It is calculated from the electric signal converted based on the electric signal. Only the X-ray exposure amount detection pixel group D is originally stored in the X-ray exposure amount detection pixel group D at time t 4 based on the added value of the electric signals accumulated in each pixel adjacent to each X-ray exposure amount detection pixel. You may make it calculate the electric signal which should be performed.
【００６９】Ｘ線露光量検出画素群Ｂの各Ｘ線露光量検
出画素では、時刻ｔ2 での電気信号の読出しにより蓄積
された電気信号が一端０になるので、時刻ｔ2 〜ｔ4 間
のみの電気信号ｖbiが蓄積されている。そのため、図７
に示す補完・推定処理部５７の電気信号演算部５３で
は、時刻ｔ0 〜ｔ2 間で蓄積されるべき電気信号を各Ｘ
線露光量検出画素に隣接する各画素の時刻ｔ0 〜ｔ4 間
の電気信号の加算値ｖbi p に基づいて推定し、本来Ｘ線
露光量検出画素群Ｂが時刻ｔ4 で蓄積されるべき電気信
号を次式により演算する。[0069] In each X-ray exposure amount detection pixel of the X-ray exposure amount detection pixel group B, the electrical signals accumulated by reading the electric signal at time t 2 is at one end 0, between the time t 2 ~t 4 Only the electrical signal v bi is stored. Therefore,
In the electric signal calculation unit 53 of the complementary-estimation processing unit 57 shown in the time t 0 ~t electrical signals to be stored between 2 each X
The X-ray exposure amount detection pixel group B is originally estimated at the time t 4 and estimated based on the added value v bi p of the electric signals between the times t 0 to t 4 of each pixel adjacent to the line exposure amount detection pixel. The power signal is calculated by the following equation.
【００７０】ｖbi true＝ｖbi＋（ｔ2 ／ｔ4 ）ｖbi p Ｘ線露光量検出画素群Ｃの各Ｘ線露光量検出画素では、
時刻ｔ3 での電気信号の読出しにより蓄積された電気信
号が一端０になるので、時刻ｔ3 〜ｔ4 間のみの電気信
号ｖciが蓄積されている。そのため、図７に示す補完・
推定処理部５７の電気信号演算部５３では、時刻ｔ0 〜
ｔ3 間で蓄積されるべき電気信号を各Ｘ線露光量検出画
素に隣接する各画素の時刻ｔ0 〜ｔ4 間の電気信号の加
算値ｖci p に基づいて推定し、本来Ｘ線露光量検出画素
群Ｃが時刻ｔ4 で蓄積されるべき電気信号を次式により
演算する。V bi true = v bi + (t 2 / t 4 ) v bi p In each X-ray exposure amount detection pixel of the X-ray exposure amount detection pixel group C,
Since the electric signal accumulated by the reading of the electric signal at the time t 3 becomes 0 once, the electric signal v ci is accumulated only between the times t 3 and t 4 . Therefore, the complement shown in FIG.
In the electric signal calculation unit 53 of the estimation processing unit 57, from time t 0 to.
The electrical signal to be accumulated during t 3 is estimated based on the added value v ci p of the electrical signal between times t 0 and t 4 of each pixel adjacent to each X-ray exposure amount detection pixel, and the original X-ray exposure is performed. The electric signal to be accumulated by the quantity detection pixel group C at time t 4 is calculated by the following equation.
【００７１】ｖci true＝ｖci＋（ｔ3 ／ｔ4 ）ｖbi p Ｘ線露光量検出画素群Ｄの各Ｘ線露光量検出画素では、
時刻ｔ4 での電気信号の読出しにより蓄積された電気信
号が０になるので、時刻ｔ4 では電気信号は蓄積されて
いない。そのため、図７に示す補完・推定処理部５７の
電気信号演算部５３では、時刻ｔ0 〜ｔ4 間で蓄積され
るべき電気信号を各Ｘ線露光量検出画素に隣接する各画
素の時刻ｔ0 〜ｔ4 間の電気信号の加算値ｖdi p を次式
に示すように本来Ｘ線露光量検出画素群Ｄが時刻ｔ4 で
蓄積されるべき電気信号とする。V ci true = v ci + (t 3 / t 4 ) v bi p For each X-ray exposure amount detection pixel of the X-ray exposure amount detection pixel group D,
Since the electric signal accumulated by reading the electric signal at the time t 4 becomes 0, the electric signal is not accumulated at the time t 4 . Therefore, in the electric signal calculation unit 53 of the complementation / estimation processing unit 57 shown in FIG. 7, the electric signal to be accumulated during the time t 0 to t 4 is output at the time t of each pixel adjacent to each X-ray exposure amount detection pixel. 0 sum of electrical signals between ~t 4 v di p original X-ray exposure amount detection pixel group D as shown in the following formula is an electric signal to be accumulated at time t 4.
【００７２】ｖdi true＝ｖdi p そして、切り換え部５５では、光−電気信号変換部７か
ら電気信号を読出すことによってＸ線画像を得るとき、
Ｘ線露光量検出画素の電気信号は、電気信号演算部５３
に前述のように演算させたものを読出し、Ｘ線露光量検
出画素以外の画素の電気信号は、光−電気信号変換部７
に蓄積されたものを読出す。そして、切り換え部５５
は、読出した電気信号を画像出力部（図示せず）に出力
する。V di true = v di p Then, in the switching unit 55, when an X-ray image is obtained by reading the electric signal from the optical-electrical signal converting unit 7,
The electric signal of the X-ray exposure amount detection pixel is the electric signal calculation unit 53.
Then, the electric signals of pixels other than the X-ray exposure amount detection pixels are read out by the optical-electrical signal conversion unit 7.
Read what is stored in. Then, the switching unit 55
Outputs the read electrical signal to an image output unit (not shown).
【００７３】これにより、Ｘ線露光量検出画素の電気信
号が補完され、光−電気信号変換部７からそのまま電気
信号を読出して画像出力部に出力したときに生じるＸ線
露光量検出画素部分の画像消失が無くなる。As a result, the electric signal of the X-ray exposure amount detection pixel is complemented, and the electric signal of the X-ray exposure amount detection pixel portion generated when the electric signal is directly read from the optical-electrical signal conversion unit 7 and output to the image output unit. Image disappearance disappears.
【００７４】このように、第２実施例のＸ線診断装置４
１では、予め決められたＸ線露光量検出画素群の各電気
信号を電気信号読出し部４５により所定時間間隔でＸ線
露光量検出画素群毎に読出し、重み付け部１９により重
み付けして加算した電気信号が、判定部４９に予め設定
してある所定値より大きくなったとき、Ｘ線曝射停止信
号をＸ線制御部１３に対して出力する。そのため、特別
に光検出器を設けることなくＸ線露光量を適性に制御す
ることが可能となる。As described above, the X-ray diagnostic apparatus 4 of the second embodiment
In No. 1, the electric signals of the predetermined X-ray exposure amount detection pixel group are read out by the electric signal reading unit 45 for each X-ray exposure amount detection pixel group at predetermined time intervals, and weighted by the weighting unit 19 to add the electric signals. When the signal becomes larger than a predetermined value preset in the determination unit 49, an X-ray exposure stop signal is output to the X-ray control unit 13. Therefore, the X-ray exposure amount can be appropriately controlled without providing a special photodetector.
【００７５】また、光−電気信号変換部７から電気信号
を読出すことによってＸ線画像を得るとき、切り換え部
５５により、Ｘ線露光量検出画素の電気信号は補完・推
定処理部５７の電気信号演算部５３に演算させたものを
読出し、Ｘ線露光量検出画素以外の画素の電気信号は光
−電気信号変換部７に蓄積されたものを読出すようにし
ている。このため、光−電気信号変換部７の一部の画素
をＸ線露光量検出画素として用いても、第１実施例のよ
うに補完・推定処理部５７に画像メモリ２７を設けるこ
となくＸ線画像を得ることができる。Further, when an X-ray image is obtained by reading the electric signal from the optical-electrical signal conversion unit 7, the switching unit 55 causes the electric signal of the X-ray exposure amount detection pixel to be the electric signal of the complementation / estimation processing unit 57. The signals calculated by the signal calculation unit 53 are read out, and the electric signals of the pixels other than the X-ray exposure amount detection pixels are read out from those accumulated in the optical-electrical signal conversion unit 7. Therefore, even if some pixels of the optical-electrical signal conversion unit 7 are used as the X-ray exposure amount detection pixels, the X-rays are not provided in the complementation / estimation processing unit 57 as in the first embodiment. Images can be obtained.
【００７６】なお、第２実施例のＸ線診断装置４１は、
光−電気信号変換部７から電気信号を読出すことによっ
てＸ線画像を得るとき、切り換え部５５により、Ｘ線露
光量検出画素の電気信号は補完・推定処理部５７の電気
信号演算部５３に演算させたものを読出し、Ｘ線露光量
検出画素以外の画素の電気信号は光−電気信号変換部７
に蓄積されたものを読出すようにしているが、これに限
らず、前記同様、Ｘ線露光量検出画素の電気信号は、そ
のＸ線露光量検出画素に隣接する画素の電気信号と同値
とするようにしても良い。また、Ｘ線露光量検出画素の
電気信号は、そのＸ線露光量検出画素に隣接する８近
傍、４近傍等の空間フィルターを用いて求めるようにし
ても良い。The X-ray diagnostic apparatus 41 of the second embodiment is
When an X-ray image is obtained by reading the electric signal from the optical-electrical signal conversion unit 7, the electric signal of the X-ray exposure amount detection pixel is transferred to the electric signal calculation unit 53 of the complementation / estimation processing unit 57 by the switching unit 55. The calculated signals are read out, and the electric signals of the pixels other than the X-ray exposure amount detection pixels are converted into the optical-electrical signal conversion unit 7.
However, not limited to this, the electric signal of the X-ray exposure amount detection pixel has the same value as the electric signal of the pixel adjacent to the X-ray exposure amount detection pixel. It may be done. Further, the electric signal of the X-ray exposure amount detection pixel may be obtained by using a spatial filter of 8 neighborhoods, 4 neighborhoods or the like adjacent to the X-ray exposure amount detection pixel.
【００７７】また、第２実施例のＸ線診断装置４１のＸ
線露光量検出画素群は、Ｘ線露光量検出の時間間隔と、
Ｘ線曝射の最長時間とから計算される実際に起こり得る
Ｘ線露光量検出回数に十分に足り得る数としているが、
これに限らず、Ｘ線露光量検出画素群を所定数、例えば
３つ設け、この３つのＸ線露光量検出画素群の各電気信
号を繰り返し読出すようにしても良い。この場合、時刻
ｔ4 以後のＸ線露光量検出画素群の電気信号は、それま
で光−電気信号変換部７のＸ線露光量検出画素群に蓄積
された電気信号に、Ｘ線露光量検出画素の隣接画素から
電気信号演算部５３により演算された電気信号を加算し
て求める。そして重み付け部１９により重み付け後、得
られたＸ線露光量検出画素群の各電気信号の加算値と予
め設定されている所定値を判定部４９により比較する。
そして、得られたＸ線露光量検出画素群の各電気信号の
加算値の方が大きい場合、Ｘ線制御部１３に対してＸ線
曝射停止信号を出力する。また、光−電気信号変換部７
から電気信号を読出すことによってＸ線画像を得る場合
はそのＸ線の曝射時間に対応させ、第２実施例と同様
に、Ｘ線露光量検出画素の電気信号は補完・推定処理部
５７の電気信号演算部５３に演算させたものを読出し、
Ｘ線露光量検出画素以外の画素の電気信号は光−電気信
号変換部７に蓄積されたものを読出すようにする。Further, the X of the X-ray diagnostic apparatus 41 of the second embodiment is
The line exposure amount detection pixel group includes a time interval of X-ray exposure amount detection,
Although it is set to a number that is sufficiently sufficient for the number of times of actual detection of the X-ray exposure amount calculated from the maximum time of X-ray exposure,
Not limited to this, a predetermined number of, for example, three X-ray exposure amount detection pixel groups may be provided, and each electric signal of these three X-ray exposure amount detection pixel groups may be repeatedly read. In this case, the electric signal of the X-ray exposure amount detection pixel group after time t 4 is the same as the electric signal accumulated in the X-ray exposure amount detection pixel group of the optical-electrical signal conversion unit 7 until then. The electric signal calculated by the electric signal calculation unit 53 from the pixel adjacent to the pixel is added and obtained. Then, after weighting by the weighting unit 19, the determination unit 49 compares the added value of each electric signal of the obtained X-ray exposure amount detection pixel group with a preset predetermined value.
Then, when the added value of the electric signals of the obtained X-ray exposure amount detection pixel group is larger, the X-ray exposure stop signal is output to the X-ray control unit 13. In addition, the optical-electrical signal converter 7
When an X-ray image is obtained by reading the electric signal from the X-ray exposure amount, the X-ray exposure time is made to correspond to the X-ray exposure time, and the electric signal of the X-ray exposure amount detection pixel is complemented / estimated by the processing unit 57 as in the second embodiment. Read out what is calculated by the electric signal calculation unit 53 of
The electric signals of the pixels other than the X-ray exposure amount detection pixels are read out from the electric signals accumulated in the optical-electrical signal converter 7.
【００７８】[0078]
【発明の効果】以上説明したように本発明によれば、Ｘ
線診断装置のＸ線露光量を光−電気変換手段の一部の画
素の電気信号に基づいて検出し、この電気信号値が所定
の値以上となったとき、Ｘ線の曝射を停止するようにし
ているので、Ｘ線を可視光に変換するＸ線−光信号変換
手段と、可視光を電気信号に変換する光−電気信号変換
手段が密着しているような場合であっても、Ｘ線露光量
を適性に制御することが可能となる。As described above, according to the present invention, X
The X-ray exposure amount of the X-ray diagnostic apparatus is detected based on the electric signals of some of the pixels of the light-electricity converting means, and when the electric signal value exceeds a predetermined value, the X-ray exposure is stopped. Therefore, even when the X-ray-optical signal converting means for converting X-rays into visible light and the optical-electrical signal converting means for converting visible light into an electric signal are in close contact with each other, It is possible to appropriately control the X-ray exposure amount.
【００７９】また、予め決められたＸ線露光量検出画素
の電気信号を所定時間間隔で読出し、前回蓄積された電
気信号と新しく読出された電気信号を加算して蓄積し、
この蓄積された電気信号と予め設定してある所定値を比
較し、蓄積された電気信号の方が大きくなったとき、Ｘ
線の曝射を停止させるようにしているので、特別に光検
出器を設けることなくＸ線露光量を適性に制御すること
が可能となる。Further, the electric signal of the predetermined X-ray exposure amount detecting pixel is read out at a predetermined time interval, and the electric signal previously accumulated and the newly read electric signal are added and accumulated,
When the accumulated electric signal is compared with a predetermined value set in advance and the accumulated electric signal becomes larger, X
Since the radiation of the rays is stopped, it is possible to appropriately control the X-ray exposure amount without providing a special photodetector.
【００８０】さらに、予め決められたＸ線露光量検出画
素の電気信号が読出されたとき、Ｘ線露光量検出画素毎
にその電気信号を対応する電気信号記憶手段に蓄積さ
せ、光−電気信号変換手段から電気信号を読出すことに
よってＸ線画像を得るとき、Ｘ線露光量検出画素の電気
信号は、前記電気信号記憶手段から読出し、Ｘ線露光量
検出画素以外の画素の電気信号は、光−電気信号変換手
段から読出すようにしているので、光−電気信号変換手
段の一部の画素をＸ線露光量検出画素として用いても、
正確なＸ線画像を得ることができる。Further, when the predetermined electric signal of the X-ray exposure amount detection pixel is read, the electric signal is stored in the corresponding electric signal storage means for each X-ray exposure amount detection pixel, and the optical-electric signal is stored. When an X-ray image is obtained by reading the electric signal from the conversion means, the electric signal of the X-ray exposure amount detection pixel is read from the electric signal storage means, and the electric signals of the pixels other than the X-ray exposure amount detection pixel are Since the light is read from the optical-electrical signal converting means, even if some pixels of the optical-electrical signal converting means are used as the X-ray exposure amount detecting pixels,
An accurate X-ray image can be obtained.
【００８１】さらに、予め決められた所定数のＸ線露光
量検出画素から成る複数のＸ線露光量検出画素群の各電
気信号を所定時間間隔でＸ線露光量検出画素群毎に読出
し、その読出された電気信号と判定部に設定してある所
定値を比較し、読出された電気信号の方が大きくなった
とき、Ｘ線の曝射を停止させるようにしているので、特
別に光検出器を設けることなくＸ線露光量を適性に制御
することが可能となる。Further, each electric signal of a plurality of X-ray exposure amount detection pixel groups consisting of a predetermined number of X-ray exposure amount detection pixels is read out at predetermined time intervals for each X-ray exposure amount detection pixel group, The read electrical signal is compared with a predetermined value set in the determination unit, and when the read electrical signal becomes larger, the X-ray exposure is stopped, so that special light detection is performed. It is possible to properly control the X-ray exposure amount without providing a container.
【００８２】さらに、光−電気信号変換手段から電気信
号を読出すことによってＸ線画像を得るとき、Ｘ線露光
量検出画素の電気信号は電気信号演算手段に演算させた
ものを読出し、Ｘ線露光量検出画素以外の画素の電気信
号は光−電気信号変換手段に蓄積されたものを読出すよ
うにしているので、光−電気信号変換手段の一部の画素
をＸ線露光量検出画素として用いても、電気信号を記憶
する記憶手段を設けることなくＸ線画像を得ることがで
きる。Further, when an X-ray image is obtained by reading the electric signal from the optical-electrical signal converting means, the electric signal of the X-ray exposure amount detecting pixel is the one calculated by the electric signal calculating means, and the X-ray is obtained. Since the electric signals of the pixels other than the exposure amount detection pixels are read out from those accumulated in the optical-electrical signal conversion means, some pixels of the optical-electrical signal conversion means are used as the X-ray exposure amount detection pixels. Even if it is used, an X-ray image can be obtained without providing a storage means for storing an electric signal.
【図１】本発明に係るＸ線診断装置の第１実施例を示す
機能ブロック図である。FIG. 1 is a functional block diagram showing a first embodiment of an X-ray diagnostic apparatus according to the present invention.
【図２】Ｘ線露光量検出画素の設定例を示す説明図であ
る。FIG. 2 is an explanatory diagram showing a setting example of an X-ray exposure amount detection pixel.
【図３】図１に示すＸ線診断装置のフォトタイマ部の構
成を示す構成図である。3 is a configuration diagram showing a configuration of a photo timer unit of the X-ray diagnostic apparatus shown in FIG.
【図４】図１に示すＸ線診断装置の補完・推定処理部の
構成を示す構成図である。FIG. 4 is a configuration diagram showing a configuration of a complementary / estimation processing unit of the X-ray diagnostic apparatus shown in FIG.
【図５】図１に示すＸ線診断装置の時間経過に伴う作用
を示すタイムチャートである。5 is a time chart showing the operation of the X-ray diagnostic apparatus shown in FIG. 1 with the passage of time.
【図６】本発明に係るＸ線診断装置の第２実施例のフォ
トタイマ部を示す構成図である。FIG. 6 is a configuration diagram showing a phototimer unit of a second embodiment of the X-ray diagnostic apparatus according to the present invention.
【図７】本発明に係るＸ線診断装置の第２実施例の補完
・推定処理部を示す構成図である。FIG. 7 is a block diagram showing a complementary / estimation processing unit of a second embodiment of the X-ray diagnostic apparatus according to the present invention.
【図８】Ｘ線露光量検出画素群の設定例を示す説明図で
ある。FIG. 8 is an explanatory diagram showing a setting example of an X-ray exposure amount detection pixel group.
【図９】第２実施例のＸ線診断装置の時間経過に伴う作
用を示すタイムチャートである。FIG. 9 is a time chart showing the operation of the X-ray diagnostic apparatus according to the second embodiment over time.
【図１０】従来のＸ線診断装置を示す構成図である。FIG. 10 is a configuration diagram showing a conventional X-ray diagnostic apparatus.
【図１１】図１０に示すＸ線診断装置以外の従来のＸ線
診断装置を示す構成図である。11 is a configuration diagram showing a conventional X-ray diagnostic apparatus other than the X-ray diagnostic apparatus shown in FIG.
【図１２】Ｘ線−光信号変換手段と光−電気信号変換手
段が密着しているようなＸ線診断装置を示す構成図であ
る。FIG. 12 is a configuration diagram showing an X-ray diagnostic apparatus in which the X-ray-optical signal converting means and the optical-electrical signal converting means are in close contact with each other.
１，４１ Ｘ線診断装置 ３ Ｘ線管 ５ Ｘ線−光信号変換部（Ｘ線−光信号変換手段） ７ 光−電気信号変換部（光−電気信号変換手段） ９ 信号制御部（電気信号蓄積手段） １１ フォトタイマ部 １３ Ｘ線制御部（判定手段） １５ 補完・推定処理部 １７ 電気信号読出し部（電気信号蓄積手段） １９ 重み付け部（電気信号蓄積手段） ２１ メモリ（電気信号蓄積手段） ２３ 電気信号蓄積部（電気信号蓄積手段） ２５ 判定部（判定手段） ２７ 画像メモリ（電気信号記憶手段） ２９ 電気信号記憶部（電気信号記憶手段） ３１ 切り換え部（切り換え手段） ４３ 信号制御部（判定手段） ４５ 電気信号読出し部（判定手段） ４７ 加算部（判定手段） ４９ 判定部（判定手段） ５１ フォトタイマ部 ５３ 電気信号演算部（電気信号演算手段） ５５ 切り換え部（切り換え手段） ５７ 補完・推定処理部 1,41 X-ray diagnostic apparatus 3 X-ray tube 5 X-ray-optical signal converter (X-ray-optical signal converter) 7 Optical-electrical signal converter (optical-electrical signal converter) 9 Signal controller (electrical signal) Storage unit 11 Photo timer unit 13 X-ray control unit (determination unit) 15 Complementation / estimation processing unit 17 Electric signal reading unit (electric signal storage unit) 19 Weighting unit (electric signal storage unit) 21 Memory (electric signal storage unit) 23 electrical signal storage unit (electrical signal storage means) 25 determination unit (determination means) 27 image memory (electrical signal storage means) 29 electrical signal storage unit (electrical signal storage means) 31 switching unit (switching means) 43 signal control unit ( Judgment means) 45 Electric signal reading section (judgment means) 47 Addition section (judgment means) 49 Judgment section (judgment means) 51 Photo timer section 53 Electric signal calculation section (electric signal calculation means) 5 switching section (switching means) 57 complement and estimation processor
Claims (3)
換手段と、このＸ線−光信号変換手段により変換された
光信号を複数の画素により撮像して電気信号に変換する
光−電気変換手段とを備えるＸ線診断装置において、 前記光−電気信号変換手段の一部の画素の電気信号値に
よってＸ線露光量の制御を行うＸ線露光量制御手段を具
備することを特徴とするＸ線診断装置。1. An X-ray-optical signal converting means for converting an X-ray into an optical signal, and light for capturing an optical signal converted by the X-ray-optical signal converting means by a plurality of pixels and converting it into an electric signal. An X-ray exposure apparatus including: an electric conversion unit, which comprises an X-ray exposure amount control unit for controlling the X-ray exposure amount according to electric signal values of some pixels of the optical-electrical signal conversion unit. X-ray diagnostic device.
換手段と、 前記Ｘ線−光信号変換手段によって変換された光信号を
複数の画素によって受光し、受光量に応じて電気信号を
蓄積するとともに、蓄積された電気信号を読出したと
き、電気信号の蓄積を初期値に戻す光−電気信号変換手
段と、 前記光−電気信号変換手段の所定画素をＸ線の露光量を
検出するＸ線露光量検出画素とし、このＸ線露光量検出
画素により変換された電気信号を所定時間間隔で読出
し、それを蓄積していく電気信号蓄積手段と、 前記電気信号蓄積手段によって蓄積された電気信号が予
め設定されている所定値より大きくなった場合、Ｘ線の
曝射を停止させる判定手段と、 前記電気信号蓄積手段によりＸ線露光量検出画素の電気
信号が読出されたとき、その電気信号をＸ線露光量検出
画素毎に加算して蓄積する電気信号記憶手段と、 前記光−電気信号変換手段から電気信号を読出すことに
よってＸ線画像を得るとき、Ｘ線露光量検出画素の電気
信号は、前記電気信号記憶手段から読出し、Ｘ線露光量
検出画素以外の画素の電気信号は、光−電気信号変換手
段から読出す切り換え手段と、 を具備することを特徴とするＸ線診断装置。2. An X-ray-optical signal converting means for converting an X-ray into an optical signal, and an optical signal converted by the X-ray-optical signal converting means is received by a plurality of pixels, and electricity is supplied according to an amount of received light. An optical-electrical signal converting unit that stores a signal and returns the stored electric signal to an initial value when the stored electric signal is read out, and a predetermined pixel of the optical-electrical signal converting unit is used to adjust the exposure amount of X-rays. An X-ray exposure amount detection pixel to be detected, the electric signal converted by the X-ray exposure amount detection pixel is read out at a predetermined time interval, and the electric signal accumulating means for accumulating the electric signal is accumulated, and the electric signal accumulating means accumulates the electric signal. When the electrical signal becomes larger than a preset predetermined value, a determination unit that stops the X-ray exposure, and an electrical signal of the X-ray exposure amount detection pixel are read by the electrical signal storage unit, That electric telegram Is added for each X-ray exposure amount detection pixel and accumulated, and when an X-ray image is obtained by reading an electric signal from the optical-electrical signal conversion unit, an electric signal of the X-ray exposure amount detection pixel An X-ray diagnostic apparatus comprising: a switching unit that reads out a signal from the electric signal storage unit and reads out an electric signal of a pixel other than the X-ray exposure amount detection pixel from an optical-electrical signal conversion unit. .
換手段と、 前記Ｘ線−光信号変換手段によって変換された光信号を
複数の画素によって受光し、受光量に応じて電気信号を
蓄積するとともに、蓄積された電気信号を読出したと
き、電気信号の蓄積を初期値に戻す光−電気信号変換手
段と、 前記光−電気信号変換手段の互いに異なる所定数の画素
をＸ線の露光量を検出するＸ線露光量検出画素群とし、
予め互いに異なる前記Ｘ線露光量検出画素群を複数持
ち、前記Ｘ線露光量検出画素群の電気信号を所定時間間
隔で順番に読出し、その読出した値が予め設定されてい
る所定値より大きくなった場合、Ｘ線の曝射を停止させ
る判定手段と、 前記Ｘ線露光量検出画素群に蓄積されるべき電気信号
を、それまでＸ線露光量検出画素群が蓄積した電気信号
と、Ｘ線露光量検出画素群となっている画素に隣接する
画素の電気信号に基づいて換算した電気信号とから演算
する電気信号演算手段と、 前記光−電気信号変換手段から電気信号を読出すことに
よってＸ線画像を得るとき、Ｘ線露光量検出画素の電気
信号は前記電気信号演算手段に演算させたものを読出
し、Ｘ線露光量検出画素以外の画素の電気信号は光−電
気信号変換手段に蓄積されたものを読出す切り換え手段
と、 を具備することを特徴とするＸ線診断装置。3. An X-ray-optical signal converting means for converting an X-ray into an optical signal, and an optical signal converted by the X-ray-optical signal converting means is received by a plurality of pixels, and electricity is received according to an amount of received light. An optical-electrical signal conversion unit that stores a signal and returns the stored electric signal to an initial value when the stored electric signal is read out, and a predetermined number of different pixels of the optical-electrical signal conversion unit that are X-ray X-ray exposure amount detection pixel group for detecting the exposure amount of
A plurality of X-ray exposure amount detection pixel groups different from each other are provided in advance, and electric signals of the X-ray exposure amount detection pixel group are sequentially read at predetermined time intervals, and the read value becomes larger than a preset predetermined value. In this case, the determination means for stopping the X-ray exposure, the electric signal to be accumulated in the X-ray exposure amount detection pixel group, the electric signal accumulated in the X-ray exposure amount detection pixel group until then, the X-ray X by reading out the electric signal from the electric signal calculating means for calculating from the electric signal converted based on the electric signal of the pixel adjacent to the pixel forming the exposure amount detection pixel group and the optical-electrical signal converting means. When obtaining a line image, the electric signals of the X-ray exposure amount detection pixels are read out after being calculated by the electric signal calculation means, and the electric signals of pixels other than the X-ray exposure amount detection pixels are accumulated in the optical-electrical signal conversion means. What was done X-ray diagnostic apparatus characterized by comprising a switching means, the issue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35347393A JP3466684B2 (en) | 1993-12-29 | 1993-12-29 | X-ray diagnostic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35347393A JP3466684B2 (en) | 1993-12-29 | 1993-12-29 | X-ray diagnostic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07201490A true JPH07201490A (en) | 1995-08-04 |
| JP3466684B2 JP3466684B2 (en) | 2003-11-17 |
Family
ID=18431092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35347393A Expired - Lifetime JP3466684B2 (en) | 1993-12-29 | 1993-12-29 | X-ray diagnostic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3466684B2 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000037372A (en) * | 1998-07-21 | 2000-02-08 | Toshiba Iyo System Engineering Kk | X-ray diagnosing device and radiodiognosis device |
| JP2000195696A (en) * | 1998-12-30 | 2000-07-14 | General Electric Co <Ge> | Radiation transmittance inspection system with performance prediction of learning base |
| JP2010075556A (en) * | 2008-09-26 | 2010-04-08 | Toshiba Corp | X-ray exposure controller, method thereof, and radiographic apparatus |
| EP2564783A1 (en) | 2011-09-05 | 2013-03-06 | Fujifilm Corporation | Radiographing system, method of controlling automatic exposure in radiographing system, and radiological image detection device |
| EP2564785A1 (en) | 2011-09-05 | 2013-03-06 | Fujifilm Corporation | Radiographic system, automatic exposure control method of radiographic system, and radiological image detector |
| WO2014017179A1 (en) * | 2012-07-27 | 2014-01-30 | 富士フイルム株式会社 | Radiation image detection device, radiation imaging system, and operation method therefor |
| US8829455B2 (en) | 2010-10-26 | 2014-09-09 | Fujifilm Corporation | Radiographic imaging device |
| US9050051B2 (en) | 2010-10-26 | 2015-06-09 | Fujifilm Corporation | Radiographic imaging device and computer readable medium |
| JP2016001925A (en) * | 2015-09-24 | 2016-01-07 | キヤノン株式会社 | Imaging apparatus and its control method, and imaging system |
| JP2016139619A (en) * | 2010-04-13 | 2016-08-04 | ケアストリーム ヘルス インク | Exposure control using digital radiography detector |
| WO2016189849A1 (en) * | 2015-05-26 | 2016-12-01 | Canon Kabushiki Kaisha | Radiation imaging apparatus, radiation imaging system, and exposure control method |
| JP2017012242A (en) * | 2015-06-26 | 2017-01-19 | キヤノン株式会社 | Radiation imaging apparatus and control method thereof |
| US9668331B2 (en) | 2012-04-12 | 2017-05-30 | Fujifilm Corporation | X-ray exposure control device, X-ray image detection apparatus, and X-ray imaging system |
| WO2017094393A1 (en) * | 2015-12-01 | 2017-06-08 | Canon Kabushiki Kaisha | Radiation imaging apparatus and method of controlling the same |
| US9780128B2 (en) | 2012-07-27 | 2017-10-03 | Fujifilm Corporation | Radiation image detecting device, radiation imaging system and operation method thereof |
| US9892521B2 (en) | 2013-02-20 | 2018-02-13 | Fujifilm Corporation | Radiation image processing device and method, and radiographic imaging system |
-
1993
- 1993-12-29 JP JP35347393A patent/JP3466684B2/en not_active Expired - Lifetime
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208710B1 (en) | 1998-07-21 | 2001-03-27 | Kabushiki Kaisha Toshiba | X-ray diagnostic apparatus and radiation diagnostic apparatus |
| JP2000037372A (en) * | 1998-07-21 | 2000-02-08 | Toshiba Iyo System Engineering Kk | X-ray diagnosing device and radiodiognosis device |
| JP2000195696A (en) * | 1998-12-30 | 2000-07-14 | General Electric Co <Ge> | Radiation transmittance inspection system with performance prediction of learning base |
| JP2010075556A (en) * | 2008-09-26 | 2010-04-08 | Toshiba Corp | X-ray exposure controller, method thereof, and radiographic apparatus |
| JP2016139619A (en) * | 2010-04-13 | 2016-08-04 | ケアストリーム ヘルス インク | Exposure control using digital radiography detector |
| US9050051B2 (en) | 2010-10-26 | 2015-06-09 | Fujifilm Corporation | Radiographic imaging device and computer readable medium |
| US9592017B2 (en) | 2010-10-26 | 2017-03-14 | Fujifilm Corporation | Radiographic imaging device and computer readable medium |
| US8829455B2 (en) | 2010-10-26 | 2014-09-09 | Fujifilm Corporation | Radiographic imaging device |
| US9060731B2 (en) | 2011-09-05 | 2015-06-23 | Fujifilm Corporation | Radiographing system, method of controlling automatic exposure in radiographing system, and radiological image detection device |
| EP2564783A1 (en) | 2011-09-05 | 2013-03-06 | Fujifilm Corporation | Radiographing system, method of controlling automatic exposure in radiographing system, and radiological image detection device |
| US9060738B2 (en) | 2011-09-05 | 2015-06-23 | Fujifilm Corporation | Radiographic system, automatic exposure control method of radiographic system, and radiological image detector |
| EP2564785A1 (en) | 2011-09-05 | 2013-03-06 | Fujifilm Corporation | Radiographic system, automatic exposure control method of radiographic system, and radiological image detector |
| EP3424429A1 (en) | 2012-04-12 | 2019-01-09 | Fujifilm Corporation | X-ray exposure control device, x-ray image detection apparatus, and x-ray image capturing system |
| EP3424430A1 (en) | 2012-04-12 | 2019-01-09 | Fujifilm Corporation | X-ray exposure control device, x-ray image detection apparatus, and x-ray image capturing system |
| US9668331B2 (en) | 2012-04-12 | 2017-05-30 | Fujifilm Corporation | X-ray exposure control device, X-ray image detection apparatus, and X-ray imaging system |
| WO2014017179A1 (en) * | 2012-07-27 | 2014-01-30 | 富士フイルム株式会社 | Radiation image detection device, radiation imaging system, and operation method therefor |
| CN104602607A (en) * | 2012-07-27 | 2015-05-06 | 富士胶片株式会社 | Radiation image detection device, radiation imaging system, and operation method therefor |
| US9780128B2 (en) | 2012-07-27 | 2017-10-03 | Fujifilm Corporation | Radiation image detecting device, radiation imaging system and operation method thereof |
| US9793305B2 (en) | 2012-07-27 | 2017-10-17 | Fujifilm Corporation | Radiation image detecting device, radiation imaging system and operation method thereof |
| US9892521B2 (en) | 2013-02-20 | 2018-02-13 | Fujifilm Corporation | Radiation image processing device and method, and radiographic imaging system |
| WO2016189849A1 (en) * | 2015-05-26 | 2016-12-01 | Canon Kabushiki Kaisha | Radiation imaging apparatus, radiation imaging system, and exposure control method |
| JP2017012242A (en) * | 2015-06-26 | 2017-01-19 | キヤノン株式会社 | Radiation imaging apparatus and control method thereof |
| US9885790B2 (en) | 2015-06-26 | 2018-02-06 | Canon Kabushiki Kaisha | Radiation imaging apparatus and control method thereof |
| JP2016001925A (en) * | 2015-09-24 | 2016-01-07 | キヤノン株式会社 | Imaging apparatus and its control method, and imaging system |
| WO2017094393A1 (en) * | 2015-12-01 | 2017-06-08 | Canon Kabushiki Kaisha | Radiation imaging apparatus and method of controlling the same |
| US10349914B2 (en) | 2015-12-01 | 2019-07-16 | Canon Kabushiki Kaisha | Radiation imaging apparatus and method of controlling the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3466684B2 (en) | 2003-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3466684B2 (en) | X-ray diagnostic equipment | |
| KR101419947B1 (en) | Image capturing apparatus, light metering method, luminance calculation method, and storage medium | |
| US6151073A (en) | Intelligent camera flash system | |
| CN102670222B (en) | Radiation imaging apparatus and method for controlling same | |
| US6847698B2 (en) | Radiation image sensing apparatus | |
| KR20040099123A (en) | Radiation imaging apparatus | |
| CA1262191A (en) | X-ray examination system and method of controlling an exposure therein | |
| JP2000100597A (en) | Radiation image pickup device | |
| JPH07171142A (en) | Radiodiagnostic device | |
| JPS59142506A (en) | Focus detecting device | |
| JPH11284809A (en) | Acquiring method for data for shading correction | |
| JP2006180270A (en) | Image processor, imaging device, image processing method, program, and recording medium | |
| JP2007166076A (en) | Imaging device | |
| WO2004110056A1 (en) | Detector for the detection of x-radiation | |
| US5999661A (en) | Image processing method and system | |
| JPH05153496A (en) | X-ray image pickup device, x-ray perspective device and x-ray television camera device used for them | |
| JP3072849B2 (en) | X-ray diagnostic imaging device | |
| JP3330384B2 (en) | Electronic imaging device | |
| JP4548038B2 (en) | Focus detection device and camera equipped with focus detection device | |
| JP3002502B2 (en) | Multi-dimming autofocus camera | |
| JP2808222B2 (en) | Video camera and photometric method thereof | |
| JPH08163441A (en) | X-ray radiographing device | |
| US7436452B2 (en) | Method and apparatus for reduction of residual signal in digital images captured by image sensors | |
| JP2006352433A (en) | Digital camera and control method thereof | |
| JPH07255014A (en) | Image pickup device and its control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070829 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080829 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090829 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100829 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100829 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110829 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120829 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120829 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130829 Year of fee payment: 10 |
|
| EXPY | Cancellation because of completion of term |