JPH0544794B2 - - Google Patents
Info
- Publication number
- JPH0544794B2 JPH0544794B2 JP59034153A JP3415384A JPH0544794B2 JP H0544794 B2 JPH0544794 B2 JP H0544794B2 JP 59034153 A JP59034153 A JP 59034153A JP 3415384 A JP3415384 A JP 3415384A JP H0544794 B2 JPH0544794 B2 JP H0544794B2
- Authority
- JP
- Japan
- Prior art keywords
- ray
- signal
- excessive
- rays
- bed
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 19
- 238000003384 imaging method Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000002594 fluoroscopy Methods 0.000 description 14
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 7
- 210000004072 lung Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 210000003238 esophagus Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002601 radiography Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
- H05G1/38—Exposure time
- H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
- H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- X-Ray Techniques (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Radiography Using Non-Light Waves (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はイメージインテンシフアイア（以下
「Ｉ・Ｉ」という）の入力面に人体を透過しない
Ｘ線（直接Ｘ線）あるいは肺野を透過したＸ線等
（以下「過大Ｘ線」という）が入射するような場
合にも撮影用フイルムの濃度が低下することなく
適正となるようにしたＸ線撮影装置に関するもの
である。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an input surface of an image intensifier (hereinafter referred to as "I・I") that uses X-rays that do not pass through the human body (direct The present invention relates to an X-ray photographing apparatus in which the density of photographic film does not decrease and remains appropriate even when X-rays or the like (hereinafter referred to as "excessive X-rays") are incident.
Ｘ線撮影装置におけるＸ線自動露出制御装置
は、Ｉ・Ｉの出力面の所定の部分の光量を検出す
るＩ・Ｉ出力光検出器を設け、このＩ・Ｉ出力光
検出器を介してＸ線写真が適正な濃度となるため
に必要なＸ線量が曝射されたときＸ線曝射を停止
するようにＸ線発生器を制御する構成となつてい
る。
An X-ray automatic exposure control device in an X-ray imaging device is provided with an I/I output photodetector that detects the amount of light at a predetermined portion of the output surface of the I/I, and the X-ray The X-ray generator is configured to control the X-ray generator so as to stop X-ray exposure when the X-ray dose necessary for the X-ray photograph to have an appropriate density has been emitted.
Ｘ線自動露出制御装置のＸ線検出手段として
Ｉ・Ｉ出力光検出器を用いた場合に、人体を斜め
に傾けてＸ線写真の撮影を行なう斜位撮影のよう
な術式においては、Ｉ・Ｉ入力面に直接Ｘ線が入
射することが多く、その影響によりＸ線写真が適
正濃度より低下し診断に適さないことがある。ま
た、撮影部内に肺野を含む場合も直接Ｘ線に近い
過大なＸ線がＩ・Ｉ入力面に入射し、同様の悪影
響を及ぼす。
When an I/I output photodetector is used as the X-ray detection means of an automatic X-ray exposure control device, the I・X-rays are often directly incident on the I input surface, and due to this influence, the density of the X-ray photograph may be lower than the appropriate density, making it unsuitable for diagnosis. Furthermore, when the imaging unit includes a lung field, excessive X-rays similar to direct X-rays enter the I/I input surface, causing a similar adverse effect.
このため、透視中のテレビジヨン系のビデオ信
号により過大Ｘ線を判定し、この判定結果により
適当な補正を加えて濃度低下を防止したり、また
は、Ｉ・Ｉ出力光検出器を多数設け、透視中の各
Ｉ・Ｉ出力光検出器からの出力の強弱により撮影
時に使用するＩ・Ｉ出力光検出器を選択すること
により過大Ｘ線の影響を除去する方法が実施され
ている。 For this reason, excessive X-rays are determined from the video signal of the television system during fluoroscopy, and appropriate correction is made based on this determination result to prevent a decrease in density, or a large number of I/I output photodetectors are installed. A method has been implemented in which the influence of excessive X-rays is removed by selecting the I/I output photodetector to be used during imaging based on the strength of the output from each I/I output photodetector during fluoroscopy.
しかしながら、このような方法によれば透視時
のビデオ信号の大小やＩ・Ｉ出力光検出器の出力
の強弱だけで過大Ｘ線を判定しているため、Ｘ線
条件によつては実際に過大Ｘ線でない場合でも過
大Ｘ線であると判定することがあり、Ｘ線写真が
適正濃度とならない場合が生じるという問題があ
つた。 However, according to this method, excessive X-rays are determined only by the magnitude of the video signal during fluoroscopy or the strength of the output of the I/I output photodetector, so depending on the X-ray conditions, excessive X-rays may actually occur. There is a problem in that even if the X-ray is not an X-ray, it may be determined to be an excessive X-ray, and the X-ray photograph may not have the appropriate density.
本発明は上記事情に鑑みてなされたものであ
り、過大Ｘ線判定の精度を従来装置よりも向上さ
せて適正濃度のＸ線写真がより確実に得られるＸ
線撮影装置を提供することを目的とするものであ
る。
The present invention has been made in view of the above circumstances, and is an X-ray device that improves the accuracy of excessive X-ray determination compared to conventional devices and more reliably obtains X-ray photographs with appropriate density.
The object of the present invention is to provide a radiography device.
上記目的を達成するための本発明の概要は、被
写体を載置する寝台と、前記被写体にＸ線を曝射
するＸ線管と、被写体透過Ｘ線を光学像に変換
し、この光学像をテレビカメラによつて撮像して
テレビジヨンモニタ上に表示するテレビジヨン系
と、前記光学像の光量を基に前記Ｘ線の曝射条件
を制御する自動露出制御系とを有するＸ線撮影装
置において、分割サイズ信号及び寝台情報信号を
出力する撮影環境条件検出手段と、前記テレビジ
ヨン系からのビデオ信号のうち過大Ｘ線に対応す
る部分を検出し、過大Ｘ線検出信号を出力する過
大Ｘ線検出手段と、前記分割サイズ信号、前記寝
台情報信号及び前記過大Ｘ線検出信号を基に過大
Ｘ線による撮影用フイルムの濃度変化を補正する
補正信号を出力する補正回路とを備え、この補正
信号を前記自動露出制御系の制御信号としたこと
を特徴とするものである。
Summary of the present invention for achieving the above object includes: a bed on which a subject is placed; an X-ray tube that irradiates the subject with X-rays; An X-ray imaging apparatus having a television system that captures an image with a television camera and displays it on a television monitor, and an automatic exposure control system that controls the X-ray exposure conditions based on the light intensity of the optical image. , an imaging environment condition detection means for outputting a division size signal and a bed information signal, and an excessive X-ray detecting means for detecting a portion corresponding to excessive X-rays in the video signal from the television system and outputting an excessive X-ray detection signal. and a correction circuit for outputting a correction signal for correcting a change in density of photographic film due to excessive X-rays based on the division size signal, the bed information signal, and the excessive X-ray detection signal, the correction signal is used as a control signal for the automatic exposure control system.
以下に本発明の実施例を詳細に説明する。 Examples of the present invention will be described in detail below.
第１図はＸ線撮影装置の構成を示すものであ
り、同図において、１は被写体を載置するＸ線透
視・撮影寝台、２はスポツトシヨツト装置、３は
スポツトシヨツト装置２の後方に配置されたＸ線
像を光学像に変換するためのＩ・Ｉ、４はＩ・Ｉ
出力光検出器（例えば光電子増倍管）を含む光学
系、５はＩ・Ｉ３により光学像に変換されたＸ線
像を撮影するテレビカメラ、６は前記Ｘ線透視・
撮影寝台１に臨ませて配置したＸ線管、７は前記
テレビカメラ５の掃引等の制御を行ない、かつテ
レビカメラ５から出力されるビデオ信号をテレビ
ジヨンモニタ１４に送るビデオ信号プロセツサで
あり、テレビジヨンモニタ１４は前記ビデオ信号
及び掃引のための制御信号を得てＸ線像を画像表
示するようになつている。 Figure 1 shows the configuration of the X-ray imaging device. In the figure, 1 is an X-ray fluoroscopy/photography bed on which the subject is placed, 2 is a spot shot device, and 3 is placed behind the spot shot device 2. I/I for converting an X-ray image into an optical image, 4 is I/I
An optical system including an output photodetector (for example, a photomultiplier tube), 5 a television camera that takes an X-ray image converted into an optical image by I.I.3, and 6 the aforementioned X-ray fluoroscope.
An X-ray tube 7 placed facing the photographing table 1 is a video signal processor that controls the sweeping of the television camera 5 and sends the video signal output from the television camera 5 to the television monitor 14. The television monitor 14 receives the video signal and a control signal for sweeping to display an X-ray image.
８は前記光学系４の出力を得てその光量が所定
値となるようにＸ線制御装置１０を制御する自動
露出制御回路、９はＸ線発生器である。 8 is an automatic exposure control circuit that obtains the output of the optical system 4 and controls the X-ray control device 10 so that the amount of light becomes a predetermined value, and 9 is an X-ray generator.
Ｘ線制御装置１０は、自動露出制御回路８の出
力に応じてＸ線透視時には前記Ｘ線管６の管電
圧、管電流をＸ線発生器９を介して制御し、撮影
時には曝射時間の制御を行なう。 The X-ray control device 10 controls the tube voltage and tube current of the X-ray tube 6 during X-ray fluoroscopy according to the output of the automatic exposure control circuit 8, and controls the exposure time during imaging. control.
前記Ｉ・Ｉ３、光学系４、テレビカメラ５、ビ
デオ信号プロセツサ７及びテレビジヨンモニタ１
４によりテレビジヨン系を、前記光学系４のＩ・
Ｉ出力光検出器及び自動露出制御回路８により自
動露出制御系をそれぞれ構成している。 The I/I 3, optical system 4, television camera 5, video signal processor 7, and television monitor 1
4, the television system is connected to the optical system 4.
The I output photodetector and the automatic exposure control circuit 8 constitute an automatic exposure control system.
１１は撮影環境条件検出手段であり、前記Ｘ線
透視・撮影寝台１から寝台起倒角度を検出し寝台
起倒角度信号を寝台情報信号として出力する起倒
角度判定回路２３と、同じく撮影用フイルムの分
割サイズを判定し分割サイズ信号を出力する分割
サイズ判定回路２４とから構成される。 Reference numeral 11 denotes a photographing environment condition detection means, which includes a tilting angle determining circuit 23 for detecting a bed tilting angle from the X-ray fluoroscopy/photographing bed 1 and outputting a bed tilting angle signal as a bed information signal; and a division size determination circuit 24 that determines the division size of and outputs a division size signal.
前記寝台起倒角度信号は、Ｘ線透視・撮影寝台
１の寝台起倒角度がある一定値又はある角度範囲
（例えば、食道撮影に適する90゜前後）にある状態
のときにハイレベル（“Ｈ”レベル）となるもの
であり、このある一定値又はある角度範囲の状態
の時に食道撮影が行われる。 The bed tilting angle signal is at a high level (“H”) when the bed tilting angle of the X-ray fluoroscopy/photography bed 1 is at a certain value or within a certain angle range (for example, around 90° suitable for esophagography). ``level'', and esophagography is performed when this is at a certain value or within a certain angle range.
また、前記分割サイズ信号は撮影用フルムの分
割サイズがある特定のサイズ、例えば人体の食道
以外の部分の影響を防止するように左右２分割の
ときに“Ｈ”レベルとなるものである。 Further, the division size signal becomes an "H" level when the division size of the imaging frame is a certain specific size, for example, when the division size is divided into left and right halves to prevent the influence of parts other than the esophagus of the human body.
１３は過大Ｘ線検出手段であり、前記ビデオ信
号プロセツサ７からのビデオ信号を取り込み、そ
のビデオ信号における過大Ｘ線に相当する量に比
例した比例信号を発生する過大Ｘ線量計算回路２
１と、ビデオ信号中に過大Ｘ線が含まれている場
合に“Ｈ”レベルの過大Ｘ線検出信号を出力する
過大Ｘ線回路２２と、この過大Ｘ線検出信号と前
記撮影環境条件検出信号との論理積をとり、後述
する補正回路１２へ切換制御信号を送るアンド回
路２５とを有して構成されている。 Reference numeral 13 denotes excessive X-ray detection means, and an excessive X-ray dose calculation circuit 2 which takes in the video signal from the video signal processor 7 and generates a proportional signal proportional to the amount corresponding to the excessive X-ray in the video signal.
1, an excessive X-ray circuit 22 that outputs an "H" level excessive X-ray detection signal when excessive X-rays are included in the video signal, and this excessive X-ray detection signal and the photographing environment condition detection signal. and an AND circuit 25 that performs a logical product with the above and sends a switching control signal to a correction circuit 12, which will be described later.
補正回路１２は、前記比例信号を基に過大Ｘ線
判定時の補正信号を出力する補正信号発生回路２
８と、一定値の補正信号を出力する一定値信号発
生回路２６と、前記切換制御信号に基づき補正信
号発生回路２８、一定値信号発生回路２６の出力
を切換えるスイツチング手段２７とを有して構成
され、前記両補正信号のいずれかを自動露出制御
回路８への制御信号として出力するようになつて
いる。 The correction circuit 12 includes a correction signal generation circuit 2 that outputs a correction signal when determining excessive X-rays based on the proportional signal.
8, a constant value signal generation circuit 26 that outputs a constant value correction signal, and a switching means 27 that switches the outputs of the correction signal generation circuit 28 and the constant value signal generation circuit 26 based on the switching control signal. Either of the two correction signals is output as a control signal to the automatic exposure control circuit 8.
次に、上記構成の装置の作用を説明する。Ｘ線
透視・撮影寝台１の寝台起倒角度は起倒角度判定
回路２３により判定され、寝台起倒角度信号とし
てアンド回路２５に入力される。 Next, the operation of the apparatus having the above configuration will be explained. The tilting angle of the X-ray fluoroscopy/imaging bed 1 is determined by the tilting angle determination circuit 23, and is input to the AND circuit 25 as a bed tilting angle signal.
また、同じく撮影用フイルムの分割サイズ信号
も分割サイズ判定回路２４により判定され、分割
サイズ信号としてアンド回路２５に入力される。 Similarly, the division size signal of the photographic film is also determined by the division size determination circuit 24, and is inputted to the AND circuit 25 as a division size signal.
一方、ビデオ信号プロセツサ７からはＸ線透視
中のビデオ信号が過大Ｘ線量計算回路２１及び過
大Ｘ線回路２２へ入力される。 On the other hand, a video signal during X-ray fluoroscopy is input from the video signal processor 7 to an excessive X-ray dose calculation circuit 21 and an excessive X-ray circuit 22.
過大Ｘ線量計算回路２１は、ビデオ信号に含ま
れる過大Ｘ線の量に比例した比例信号を補正信号
発生回路２８へ送出する。 The excessive X-ray dose calculation circuit 21 sends a proportional signal proportional to the amount of excessive X-rays included in the video signal to the correction signal generation circuit 28.
一方、過大Ｘ線回路２２はビデオ信号中に過大
Ｘ線に相当するような高いレベルのビデオ信号成
分があると判定した場合に“Ｈ”レベルの過大Ｘ
線検出信号をアンド回路２５へ送出する。 On the other hand, when the excessive X-ray circuit 22 determines that there is a high-level video signal component corresponding to excessive X-rays in the video signal, the excessive
The line detection signal is sent to the AND circuit 25.
アンド回路２５は前記寝台起倒角度信号、分割
サイズ信号及び直接Ｘ線検出信号とにより、過大
Ｘ線がＩ・Ｉ３の入力面に入射する状態にＸ線透
視・撮影寝台１があると判定し、切換制御信号を
スイツチング手段２７へ送出する。 The AND circuit 25 determines that the X-ray fluoroscopy/imaging bed 1 is in a state where excessive X-rays are incident on the input surfaces of I and I3 based on the bed tilting angle signal, division size signal, and direct X-ray detection signal. , sends a switching control signal to the switching means 27.
スイツチング手段２７はこの切換制御信号に基
づき補正信号発生回路２８側へ切換わり、この結
果直接Ｘ線判定時の補正信号が制御信号として自
動露出制御回路８へ送出される。 The switching means 27 switches to the correction signal generation circuit 28 side based on this switching control signal, and as a result, the correction signal for direct X-ray determination is sent to the automatic exposure control circuit 8 as a control signal.
ビデオ信号中に直接Ｘ線の存在がない場合に
は、過大Ｘ線回路２２からアンド回路２５に対し
て直接Ｘ線検出信号が送出されず、したがつて、
この場合にはアンド回路２５からスイツチング手
段２７へ送られる切換制御信号が変化し、この結
果一定値信号発生回路２６からの補正信号が自動
露出制御回路８の制御信号として送出される。 If there is no direct X-ray in the video signal, no X-ray detection signal is directly sent from the excessive X-ray circuit 22 to the AND circuit 25, and therefore,
In this case, the switching control signal sent from the AND circuit 25 to the switching means 27 changes, and as a result, a correction signal from the constant value signal generating circuit 26 is sent as a control signal to the automatic exposure control circuit 8.
上述したように、Ｘ線透視中に撮影用フイルム
の分割サイズ、寝台起倒角度及びビデオ信号の状
態から判断して直線Ｘ線がＩ・Ｉ３の入力面に入
射していると判断した場合にはこの直接Ｘ線によ
る撮影用フイルム濃度の低下量を補正する補正信
号が補正信号発生回路２８から自動露出制御回路
８へ入力され、この結果適正な補正が行われる。 As mentioned above, if it is determined during X-ray fluoroscopy that straight X-rays are incident on the input surface of I/I3 based on the division size of the imaging film, the tilting angle of the bed, and the state of the video signal. A correction signal for correcting the amount of decrease in photographic film density due to direct X-rays is input from the correction signal generation circuit 28 to the automatic exposure control circuit 8, and as a result, appropriate correction is performed.
Ｘ線透視に続いて行なわれるＸ線撮影時には光
学系４のＩ・Ｉ出力光検出器からの出力が自動露
出制御回路８へ入力され、上述した補正信号によ
る補正を受けたのち、Ｘ線曝射停止信号が自動露
出制御回路８からＸ線制御装置１０へ出力される
ため、直接Ｘ線あるいは肺野を透過したＸ線が
Ｉ・Ｉ３の入力面に入射するような条件でＸ線撮
影を行なつても常に自動的に適正濃度のＸ線撮影
が可能となる。 During X-ray photography that follows X-ray fluoroscopy, the output from the I/I output photodetector of the optical system 4 is input to the automatic exposure control circuit 8, and after being corrected by the above-mentioned correction signal, X-ray exposure is performed. Since the radiation stop signal is output from the automatic exposure control circuit 8 to the X-ray control device 10, X-ray imaging can be performed under conditions such that direct X-rays or X-rays that have passed through the lung field are incident on the input surface of I/I3. Even if X-ray imaging is performed, it is possible to automatically perform X-ray imaging at an appropriate density.
本発明は上述した実施例に限定されるものでは
なくその要旨の範囲内で種々の変形が可能であ
る。 The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.
例えば上述した実施例では過大Ｘ線の判定をビ
デオ信号を基に行なう場合について説明したが、
Ｉ・Ｉ出力光検出器の出力信号を基に行なうよう
にしてもよい。また、寝台情報信号としては寝台
起倒角度のほかに、天板のローリング等の情報も
使用し得るものである。この場合、寝台起倒角度
及び天板のローリングの情報の両方を寝台情報信
号としてもよいし、どちらか一方を寝台情報信号
としてもよい。 For example, in the embodiment described above, a case was explained in which excessive X-rays are determined based on a video signal.
The detection may be performed based on the output signal of the I/I output photodetector. Further, as the bed information signal, in addition to the bed tilting angle, information such as the rolling of the top board can also be used. In this case, both the bed tilting angle and the top rolling information may be used as the bed information signal, or either one of them may be used as the bed information signal.
以上詳述した本発明によれば、イメージインテ
ンシフアイアの入力面に人体を透過しないＸ線あ
るいは肺野を透過したＸ線が入射するような場合
におけるＸ線撮影においても、Ｘ線自動露出制御
系の補正にＸ線透視・撮影寝台等からの分割サイ
ズ信号及び寝台情報信号をも利用しているため、
過大Ｘ線の判定精度の向上、自動露出制御の安定
性の改良を図ることができるＸ線自動露出制御装
置を提供することができる。
According to the present invention described in detail above, X-ray automatic exposure control can be performed even in X-ray imaging when X-rays that do not pass through the human body or X-rays that pass through the lung field are incident on the input surface of the image intensifier. Since the division size signal and bed information signal from the X-ray fluoroscopy/photography bed, etc. are also used for system correction,
It is possible to provide an X-ray automatic exposure control device that can improve the accuracy of determining excessive X-rays and improve the stability of automatic exposure control.
第１図は本発明の実施例を示すブロツク図、第
２図は第１図に示す装置における撮影環境条件検
出手段、過大Ｘ線検出手段及び補正回路の構成を
示すブロツク図である。
１……Ｘ線透視・撮影寝台、２……スポツトシ
ヨツト装置、３……Ｉ・Ｉ、４……光学系、５…
…テレビカメラ、６……Ｘ線管、７……ビデオ信
号プロセツサ、８……自動露出制御回路、９……
Ｘ線発生器、１０……Ｘ線制御装置、１１……撮
影環境条件検出手段、１２……補正回路、１３…
…過大Ｘ線検出手段。
FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of an imaging environment condition detecting means, an excessive X-ray detecting means, and a correction circuit in the apparatus shown in FIG. 1... X-ray fluoroscopy/photography bed, 2... Spotshot device, 3... I/I, 4... Optical system, 5...
...Television camera, 6...X-ray tube, 7...Video signal processor, 8...Automatic exposure control circuit, 9...
X-ray generator, 10... X-ray control device, 11... Imaging environment condition detection means, 12... Correction circuit, 13...
...Excessive X-ray detection means.
Claims (1)
を曝射するＸ線管と、被写体透過Ｘ線を光学像に
変換し、この光学像をテレビカメラによつて撮像
してテレビジヨンモニタ上に表示するテレビジヨ
ン系と、前記光学像の光量を基に前記Ｘ線の曝射
条件を制御する自動露出制御系とを有するＸ線撮
影装置において、 分割サイズ信号及び寝台情報信号を出力する撮
影環境条件検出手段と、前記テレビジヨン系から
のビデオ信号のうち過大Ｘ線に対応する部分を検
出し、過大Ｘ線検出信号を出力する過大Ｘ線検出
手段と、前記分割サイズ信号、前記寝台情報信号
及び前記過大Ｘ線検出信号を基に過大Ｘ線による
撮影用フイルムの濃度変化を補正する補正信号を
出力する補正回路とを備え、この補正信号を前記
自動露出制御系の制御信号としたことを特徴とす
るＸ線撮影装置。[Scope of Claims] 1. A bed on which a subject is placed, an X-ray tube that irradiates the subject with X-rays, and an X-ray tube that converts the X-rays transmitted through the subject into an optical image, and this optical image is captured by a television camera. An X-ray imaging apparatus comprising: a television system that displays images on a television monitor; and an automatic exposure control system that controls exposure conditions for the X-rays based on the light intensity of the optical image. photographing environment condition detection means for outputting an information signal; excessive X-ray detection means for detecting a portion corresponding to excessive X-rays in the video signal from the television system and outputting an excessive X-ray detection signal; a correction circuit that outputs a correction signal for correcting a change in density of photographic film due to excessive X-rays based on the size signal, the bed information signal, and the excessive X-ray detection signal; An X-ray imaging device characterized in that the control signal is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59034153A JPS60180096A (en) | 1984-02-27 | 1984-02-27 | Automatic x-ray exposure control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59034153A JPS60180096A (en) | 1984-02-27 | 1984-02-27 | Automatic x-ray exposure control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60180096A JPS60180096A (en) | 1985-09-13 |
| JPH0544794B2 true JPH0544794B2 (en) | 1993-07-07 |
Family
ID=12406254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59034153A Granted JPS60180096A (en) | 1984-02-27 | 1984-02-27 | Automatic x-ray exposure control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60180096A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0527840Y2 (en) * | 1986-09-30 | 1993-07-15 |
-
1984
- 1984-02-27 JP JP59034153A patent/JPS60180096A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60180096A (en) | 1985-09-13 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |