JPH11285486A - Radiographic apparatus - Google Patents
Radiographic apparatusInfo
- Publication number
- JPH11285486A JPH11285486A JP10091274A JP9127498A JPH11285486A JP H11285486 A JPH11285486 A JP H11285486A JP 10091274 A JP10091274 A JP 10091274A JP 9127498 A JP9127498 A JP 9127498A JP H11285486 A JPH11285486 A JP H11285486A
- Authority
- JP
- Japan
- Prior art keywords
- ray
- grid
- confusion
- pitch
- image
- 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.)
- Pending
Links
- 230000000903 blocking effect Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ｘ線像を複数画素
に分けて撮像する構成のＸ線診断装置に関し、特に、錯
乱線の影響を排除しつつモアレ縞の発生を防止できる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 configured to take an X-ray image by dividing it into a plurality of pixels, and more particularly to an X-ray diagnostic apparatus capable of preventing the occurrence of moire fringes while eliminating the influence of confusion lines.
The present invention relates to a line diagnostic device.
【０００２】[0002]
【従来の技術】従来から、Ｘ線像を２次元に配列された
画素に分けて撮像するＸ線平面検出器を用いたＸ線診断
装置として、Ｘ線を光に変換するＸ線イメージインテシ
ファイアとテレビジョンカメラ（例えばＣＣＤカメラ）
とを組み合わせたＸ線平面検出器を用いる装置が知られ
ている。かかる装置では、Ｘ線イメージインテシファイ
アにより光に変換されたＸ線像を、光学系を介してテレ
ビジョンカメラで撮像し、電気的映像として出力する。2. Description of the Related Art Conventionally, as an X-ray diagnostic apparatus using an X-ray flat panel detector for taking an image by dividing an X-ray image into two-dimensionally arranged pixels, an X-ray image intensifier for converting X-rays into light Fire and television cameras (eg CCD cameras)
There is known an apparatus using an X-ray flat panel detector that combines the above. In such an apparatus, an X-ray image converted into light by an X-ray image intensifier is captured by a television camera via an optical system and output as an electric image.
【０００３】また、近年、ＴＦＴ（薄膜トランジスタ）
をスイッチングゲートとして用いるＸ線平面検出器も開
発されている。前記ＴＦＴを使用したＸ線平面検出器
は、Ｘ線を光に変換する蛍光体と、その光を電荷に変換
するフォトダイオードと、電荷を蓄積するコンデンサー
と、電荷を読み出すためのＴＦＴとから構成され、前記
フォトダイオード（及びコンデンサー，ＴＦＴ）を２次
元に配列して構成される。In recent years, TFTs (thin film transistors)
An X-ray flat panel detector that uses a photomask as a switching gate has also been developed. The X-ray flat panel detector using the TFT includes a phosphor that converts X-rays into light, a photodiode that converts the light into charges, a capacitor that stores charges, and a TFT that reads out charges. The photodiodes (and capacitors and TFTs) are arranged two-dimensionally.
【０００４】[0004]
【発明が解決しようとする課題】ところで、被検体にお
ける錯乱線がＸ線平面検出器に入力することを防止すべ
く、Ｘ線平面検出器のＸ線入射側に、所定ピッチ毎に板
状のＸ線遮蔽部材を有する錯乱線除去グリッドを介装さ
せるようにした場合、Ｘ線平面検出器における画素ピッ
チ（ＣＣＤのピッチ，フォトダイオードのピッチ）と前
記錯乱線除去グリッドのＸ線遮蔽部材のピッチとの相関
によって、固定パターンノイズの一種としてモアレ縞が
生じるという問題があった。By the way, in order to prevent the line of confusion in the subject from being input to the X-ray flat panel detector, a plate-shaped plate is provided at a predetermined pitch on the X-ray incident side of the X-ray flat panel detector. When a confusion line eliminating grid having an X-ray shielding member is interposed, a pixel pitch (CCD pitch, photodiode pitch) in the X-ray flat panel detector and a pitch of the X-ray shielding member of the confusion line eliminating grid are used. There is a problem that moire fringes are generated as a kind of fixed pattern noise due to the correlation with.
【０００５】前記モアレ縞の対策技術として、従来、Ｘ
線曝射期間中に前記錯乱線除去グリッドを振動させるこ
とで、錯乱線除去グリッドの縞パターンをほげさせる方
法があった。[0005] As a countermeasure technique for the moiré fringe, a conventional X
There has been a method in which the stripe pattern of the confusion line removal grid is unshaded by vibrating the confusion line removal grid during the line exposure period.
【０００６】しかしながら、従来のものでは、錯乱線除
去グリッドを振動させるときの振幅（移動距離）につい
て充分な考慮がなされていなかったため、グリッドを振
動させることによるモアレ縞防止の効果を充分に得られ
ない場合が生じたり、Ｘ線遮蔽部材が傾斜して取り付け
られるグリッド周辺部分で直接線の透過率が低下してシ
ェーディングを生じたり、無用に大きな振幅の設定によ
って振動装置として大きなものを必要とする場合がある
という問題があった。However, in the prior art, sufficient consideration was not given to the amplitude (movement distance) when the confusion line removing grid was vibrated, so that the effect of preventing moire fringes by vibrating the grid was sufficiently obtained. May occur, shading may occur due to a decrease in the transmittance of direct rays in the periphery of the grid where the X-ray shielding member is attached at an angle, or a large vibration device may be required by setting an unnecessarily large amplitude. There was a problem that sometimes.
【０００７】本発明は上記問題点に鑑みなされたもので
あり、錯乱線除去グリッドを最小限の振幅で振動させる
ことでモアレ縞を効果的に防止できるＸ線診断装置を提
供することを目的とする。An object of the present invention is to provide an X-ray diagnostic apparatus capable of effectively preventing moire fringes by vibrating a confusion line removing grid with a minimum amplitude. I do.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明によるＸ線診断装置は、被検体に向けてＸ線
を曝射するＸ線管と、前記被検体を透過したＸ線像を複
数画素に分けて撮像するＸ線検出器と、該Ｘ線検出器に
入力する錯乱線を除去すべく前記Ｘ線検出器のＸ線入射
側に設けられた所定ピッチ毎に板状のＸ線遮断部材を有
する錯乱線除去グリッドと、前記Ｘ線管によるＸ線曝射
期間中に前記錯乱線除去グリッドを前記Ｘ線遮断部材の
ピッチに関連づけて振幅を設定して前記ピッチ方向に振
動させる振動装置と、を備えるようにしたものである。
尚、好適には、前記振幅は、Ｘ線遮断部材のピッチの整
数倍に設定することが望ましい。To achieve the above object, an X-ray diagnostic apparatus according to the present invention comprises: an X-ray tube for radiating X-rays toward a subject; An X-ray detector that divides an image into a plurality of pixels and picks up an image; and a plate-shaped member provided at a predetermined pitch provided on an X-ray incident side of the X-ray detector to remove a line of confusion input to the X-ray detector. A disturbing line removing grid having an X-ray blocking member, and an amplitude set in relation to a pitch of the X-ray blocking member, and an amplitude of the disturbing line removing grid is vibrated in the pitch direction during an X-ray exposure period by the X-ray tube. And a vibrating device for causing the vibration.
Preferably, the amplitude is set to an integral multiple of the pitch of the X-ray blocking member.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面に基づいて詳細に説明する。図１は実施の形態にお
けるＸ線診断装置の構成を示すシステム図であり、この
図１に示すＸ線診断装置は、Ｘ線管１からの被検体10に
Ｘ線を曝射して得られるＸ線像を、Ｘ線イメージインテ
シファイヤ２で光学像に変換した後、前記光学像をＣＣ
Ｄ等の固体撮像素子を用いるテレビジョンカメラ３で撮
像するシステムである。Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a system diagram showing a configuration of an X-ray diagnostic apparatus according to an embodiment. The X-ray diagnostic apparatus shown in FIG. 1 is obtained by exposing a subject 10 from an X-ray tube 1 to X-rays. After converting the X-ray image into an optical image with the X-ray image intensifier 2, the optical image is converted into a CC image.
This is a system for taking an image with a television camera 3 using a solid-state image sensor such as D.
【００１０】前記Ｘ線イメージインテシファイヤ２は、
Ｘ線像を入力とし、光学像を出力とする大形真空管であ
り、入力面が蛍光面と光電陰極が密着した構造となって
おり、入射Ｘ線強度に応じて光電面から放出された光電
子は集束，加速されて出力蛍光面上に縮小して結像す
る。前記Ｘ線イメージインテシファイヤ２の出力蛍光面
の発光は、光学系４を介してテレビジョンカメラ３の固
体撮像素子の受光面に結像し、固体撮像素子の画素毎の
電気信号からなる２次元画像データに変換される。テレ
ビジョンカメラ３で得られた２次元画像データは、画像
処理装置５において種々の画像処理が施された後、画像
表示装置（ＣＲＴ）６上に表示され、該表示画像に基づ
いて診断が行われる。The X-ray image intensifier 2 comprises:
A large vacuum tube that receives an X-ray image as input and outputs an optical image. The input surface has a structure in which a phosphor screen and a photocathode are in close contact, and photoelectrons emitted from the photocathode according to the incident X-ray intensity. Are focused, accelerated and reduced to form an image on the output phosphor screen. The light emitted from the output phosphor screen of the X-ray image intensifier 2 forms an image on the light receiving surface of the solid-state imaging device of the television camera 3 via the optical system 4 and includes an electric signal for each pixel of the solid-state imaging device. It is converted to two-dimensional image data. The two-dimensional image data obtained by the television camera 3 is displayed on an image display device (CRT) 6 after being subjected to various image processing in an image processing device 5, and a diagnosis is performed based on the display image. Will be
【００１１】また、前記Ｘ線イメージインテシファイヤ
２の入力面の前面には、透過Ｘ線のうちの散乱線を除去
するための錯乱線除去グリッド７が設けられている。前
記錯乱線除去グリッド７は、図２に示すように、板状の
Ｘ線遮蔽部材７ａと、板状のＸ線透過部材７ｂとを交互
に貼り合わせた構造になっており、Ｘ線遮蔽部材７ａと
しては鉛が、また、Ｘ線透過部材７ｂとしてはアルミニ
ュームや木材が一般的に用いられる。前記Ｘ線遮蔽部材
７ａのピッチを示すグリッド周波数は、臨床目的及びＸ
線診断装置の種類に応じて種々の設定がなされるが、Ｘ
線イメージインテシファイヤ２とテレビジョンカメラ３
との組み合わせからなるＸ線平面検出器を用いた上記シ
ステムでは、グリッド周波数として４〜６ lp/mm（ライ
ンペア/mm ）のものが一般的に使用される。また、前記
板状のＸ線遮蔽部材７ａを、グリッドの中心から離れる
に従って中心に向けて傾斜させ、Ｘ線管１からの直接線
を透過させるようにしてある。In addition, a confusion line removing grid 7 for removing scattered rays among transmitted X-rays is provided in front of the input surface of the X-ray image intensifier 2. As shown in FIG. 2, the confusion line removing grid 7 has a structure in which plate-shaped X-ray shielding members 7a and plate-shaped X-ray transmitting members 7b are alternately bonded to each other. Lead is used as 7a, and aluminum or wood is generally used as X-ray transmitting member 7b. The grid frequency indicating the pitch of the X-ray shielding member 7a depends on the clinical purpose and the X frequency.
Various settings are made according to the type of X-ray diagnostic apparatus.
Line image intensifier 2 and television camera 3
In the above system using the X-ray flat panel detector composed of the combination of the above, a grid frequency of 4 to 6 lp / mm (line pair / mm) is generally used. Further, the plate-shaped X-ray shielding member 7a is inclined toward the center as the distance from the center of the grid increases, so that a direct line from the X-ray tube 1 is transmitted.
【００１２】ここで、前記錯乱線除去グリッド７のＸ線
遮蔽部材７ａのピッチと、前記Ｘ線イメージインテシフ
ァイヤ２とテレビジョンカメラ３との組み合わせからな
るＸ線平面検出器におけるＸ線像の撮像における画素ピ
ッチ（ＣＣＤピッチ）との相関において、例えば図２に
示すようにＸ線遮蔽部材７ａが存在する部分の画素とＸ
線遮蔽部材７ａが存在しない部分の画素とが生じる構成
であると、Ｘ線遮蔽部材７ａによる入射Ｘ線強度の低下
が周期的に発生することで、Ｘ線平面検出器の出力画像
においてモアレ縞が発生することになる。Here, the pitch of the X-ray shielding member 7a of the confusion line removing grid 7 and the X-ray image of the X-ray flat panel detector composed of the combination of the X-ray image intensifier 2 and the television camera 3 are shown. In the correlation with the pixel pitch (CCD pitch) in imaging, for example, as shown in FIG.
In a configuration in which a pixel in a portion where the X-ray shielding member 7a does not exist is generated, the X-ray shielding member 7a periodically decreases the intensity of incident X-rays, thereby causing moire fringes in the output image of the X-ray flat panel detector. Will occur.
【００１３】そこで、本実施の形態では、前記錯乱線除
去グリッド７を、Ｘ線遮蔽部材７ａのピッチＡの整数倍
の振幅で前記ピッチ方向に振動させる振動装置８（図１
参照）を設け、Ｘ線曝射期間中に前記振動装置８によっ
て前記錯乱線除去グリッド７を振動させることで、前記
モアレ縞の発生を防止するようにしてある。Therefore, in the present embodiment, a vibrating device 8 (FIG. 1) that vibrates the confusion line removing grid 7 in the pitch direction with an amplitude that is an integral multiple of the pitch A of the X-ray shielding member 7a.
), And the vibrating device 8 vibrates the confusion line removing grid 7 during the X-ray exposure period, thereby preventing the generation of the moire fringes.
【００１４】上記のように、前記振動装置８により錯乱
線除去グリッド７を前記ピッチＡの整数倍の振幅で振動
させれば、錯乱線除去グリッド７の停止位置（初期位
置）においてＸ線遮蔽部材７ａが位置しない画素に対
し、Ｘ線遮蔽部材７ａの影響が略均等に分散されること
になり、以て、Ｘ線遮蔽部材７ａの影響を受けて特定画
素に対応するＸ線強度が低下することがなく、各画素に
対応する入射Ｘ線強度を均等化してモアレ縞の発生を防
止できる。As described above, when the confusion line removing grid 7 is vibrated by the vibration device 8 at an amplitude that is an integral multiple of the pitch A, the X-ray shielding member is stopped at the stop position (initial position) of the confusion line removing grid 7. The effect of the X-ray shielding member 7a is substantially evenly distributed to the pixel where the pixel 7a is not located, so that the X-ray intensity corresponding to the specific pixel decreases due to the influence of the X-ray shielding member 7a. Therefore, the intensity of the incident X-ray corresponding to each pixel can be equalized to prevent the occurrence of moire fringes.
【００１５】前記振動装置８による錯乱線除去グリッド
７の振動は、Ｘ線管１のＸ線照射に同期して行わせ、Ｘ
線曝射期間の終了時点で、初期位置と該初期位置からピ
ッチＡの整数倍だけ離れた最大位置とのいずれか一方に
位置していることが最も好ましく、前記初期位置と最大
位置との間の移動はＸ線曝射期間中に少なくとも１回行
われれば良い。但し、前記初期位置と最大位置との間の
移動が少なくとも１回行われた後であれば、Ｘ線曝射期
間の終了時点で錯乱線除去グリッド７が前記初期位置と
最大位置との間の中間位置に位置していても良い。The vibration of the confusion line removing grid 7 by the vibrating device 8 is performed in synchronization with the X-ray irradiation of the X-ray tube 1.
At the end of the line exposure period, it is most preferably located at one of the initial position and the maximum position separated from the initial position by an integral multiple of the pitch A, and between the initial position and the maximum position. May be performed at least once during the X-ray exposure period. However, if the movement between the initial position and the maximum position has been performed at least once, at the end of the X-ray exposure period, the confusion line removal grid 7 moves between the initial position and the maximum position. It may be located at an intermediate position.
【００１６】Ｘ線曝射時間が切り換えられる場合には、
振動装置８における駆動周波数（グリッド７の移動速
度）を、そのときのＸ線曝射時間に応じて変化させる構
成としても良いが、最も短いＸ線曝射時間で、前記初期
位置と最大位置との間の移動がＸ線曝射期間中に少なく
とも１回行われる設定としてあれば良い。即ち、Ｘ線曝
射期間が長くなればそれだけ移動回数が増えることにな
って、モアレ縞の防止効果がより大きくなるから、最も
短いＸ線曝射時間で充分なモアレ縞防止効果が得られる
設定であれば、Ｘ線曝射時間の変化に対して駆動周波数
（グリッド７の移動速度）を変化させなくても良い。When the X-ray exposure time is switched,
The driving frequency (moving speed of the grid 7) in the vibrating device 8 may be changed according to the X-ray irradiation time at that time, but the initial position and the maximum position can be changed with the shortest X-ray irradiation time. May be set to be performed at least once during the X-ray exposure period. In other words, the longer the X-ray irradiation period, the more the number of movements increases, and the greater the moire fringe prevention effect becomes. Therefore, the setting is such that a sufficient moire fringe prevention effect can be obtained with the shortest X-ray exposure time. Then, the driving frequency (movement speed of the grid 7) does not need to be changed with respect to the change in the X-ray irradiation time.
【００１７】また、錯乱線除去グリッド７の振動の振幅
（移動量）を、Ｘ線遮蔽部材７ａのピッチＡの10倍程度
以下とすることが好ましく、これにより、錯乱線除去グ
リッド７が移動しても、グリッド７周辺部の傾斜して設
けられるＸ線遮蔽部材７ａによって直接線が遮蔽されて
しまうことがなく、シェーディングの発生も回避でき
る。また、錯乱線除去グリッド７の振幅（移動量）が、
Ｘ線遮蔽部材７ａのピッチＡの10倍程度以下であれば、
前記振動装置８として比較的小型のものを用いることが
できるので、振動装置８が障害となって、被検体10の診
断部位（例えば頭部側面）にＸ線平面検出器を密着させ
ることができなくなったり、被検体10とＸ線平面検出器
との距離が大きくなって無用な拡大撮影が行われてしま
うことを回避できる。Further, it is preferable that the amplitude (movement amount) of the vibration of the confusion line removing grid 7 is not more than about 10 times the pitch A of the X-ray shielding member 7a. However, direct rays are not blocked by the X-ray blocking member 7a provided at an inclination around the grid 7, and shading can be avoided. Also, the amplitude (movement amount) of the confusion line removal grid 7 is
If the pitch A of the X-ray shielding member 7a is about 10 times or less,
Since a relatively small device can be used as the vibration device 8, the X-ray flat panel detector can be brought into close contact with a diagnostic site (for example, the side of the head) of the subject 10 because the vibration device 8 becomes an obstacle. It can be avoided that the object 10 disappears or that the distance between the subject 10 and the X-ray flat panel detector becomes large and unnecessary magnified imaging is performed.
【００１８】尚、振動装置８を、図１に示すように、Ｘ
線イメージインテシファイヤ２の容器９内に装着するこ
とが好ましく、また、振動装置８を設けることによるＸ
線イメージインテシファイヤ２の入力面からの容器９の
嵩上げ分を10mm以下とし、Ｘ線イメージインテシファイ
ヤ２の入力面中心からの半径増分を50mm以下に抑制する
ことが好ましい。As shown in FIG. 1, the vibration device 8 is
It is preferable that the X-ray image intensifier 2 is mounted in the container 9.
It is preferable that the height of the container 9 raised from the input surface of the X-ray image intensifier 2 is 10 mm or less, and the radius increment from the center of the input surface of the X-ray image intensifier 2 is 50 mm or less.
【００１９】前記振動装置８としては、例えば図３又は
図４に示すような構成のものを用いることができる。図
３に示す振動装置８は、錯乱線除去グリッド７を図で左
右方向に移動可能に支持する一方、錯乱線除去グリッド
７の左端に該錯乱線除去グリッド７を左方向に向けて付
勢するコイルスプリング11を設け、右端にワイヤー12を
介して圧電素子13を接続してある。尚、符号14は、ワイ
ヤー12の向きを90°反転させて、Ｘ線イメージインテシ
ファイヤ２の側面に支持させた圧電素子13にワイヤー12
を接続させるためのプーリである。As the vibrating device 8, for example, a device having a structure as shown in FIG. 3 or FIG. 4 can be used. The vibrating device 8 shown in FIG. 3 supports the confusion line removal grid 7 movably in the left-right direction in the figure, while urging the confusion line removal grid 7 to the left end toward the left end. A coil spring 11 is provided, and a piezoelectric element 13 is connected to the right end via a wire 12. Reference numeral 14 denotes a wire 12 that is turned over by 90 ° with respect to the piezoelectric element 13 supported on the side surface of the X-ray image intensifier 2.
Is a pulley for connecting the.
【００２０】上記構成によると、ワイヤー12が弛むこと
がないように、前記コイルスプリング11の付勢力によっ
て錯乱線除去グリッド７が図で左方向に引っ張られてお
り、この状態で、圧電素子13へ通電させて圧電素子13が
収縮又は伸長すると、その分だけ錯乱線除去グリッド７
が図で左右方向に移動することになる。従って、前記圧
電素子13に対する通電のＯＮ・ＯＦＦをパルス制御すれ
ば、通電パルスに応じて前記錯乱線除去グリッド７が振
動することになり、前記圧電素子13への通電による収縮
又は伸長が、前記Ｘ線遮蔽部材７ａのピッチＡの整数倍
となるように圧電素子13を選択し、また、通電量を制御
すれば良い。According to the above configuration, the turbulence removing grid 7 is pulled leftward in the figure by the urging force of the coil spring 11 so that the wire 12 is not loosened. When the piezoelectric element 13 contracts or expands due to energization, the confusion line removing grid 7
Moves left and right in the figure. Therefore, if ON / OFF of energization to the piezoelectric element 13 is pulse-controlled, the confusion line removing grid 7 vibrates according to the energization pulse, and contraction or expansion due to energization to the piezoelectric element 13 is reduced by the The piezoelectric element 13 may be selected so as to be an integral multiple of the pitch A of the X-ray shielding member 7a, and the amount of current may be controlled.
【００２１】一方、図４に示す振動装置８は、錯乱線除
去グリッド７を図で左右方向に移動可能に支持する一
方、モータ21で回転駆動される円板22上の偏心した位置
に偏心ピン23を立設し、該偏心ピン23の外周面に錯乱線
除去グリッド７の側面が押し当てられるように図示しな
い弾性部材によって錯乱線除去グリッド７を右方向に付
勢するか、錯乱線除去グリッド７に前記偏心ピン23が嵌
挿される長穴（図４で紙面を貫通する方向に長い長穴）
を開口させるようにする。On the other hand, the vibrating device 8 shown in FIG. 4 supports the confusion line removing grid 7 so as to be movable in the left-right direction in the figure, while the eccentric pin is located at an eccentric position on the disk 22 which is rotated by the motor 21. 23 is erected, and the confusion line removing grid 7 is urged rightward by an elastic member (not shown) so that the side surface of the confusion line removing grid 7 is pressed against the outer peripheral surface of the eccentric pin 23, or 7, an elongated hole into which the eccentric pin 23 is inserted (an elongated hole extending in a direction penetrating the paper surface in FIG. 4).
To be opened.
【００２２】かかる構成によると、偏心ピン23がモータ
21の回転に伴ってモータ21の軸回りに回転すると、該回
転は図に示す平面上では左右方向への往復動となり、該
往復動に伴って錯乱線除去グリッド７が左右方向に振動
することになる。従って、前記偏心ピン23の偏心量の２
倍が錯乱線除去グリッド７の左右方向への移動量にな
り、前記偏心量を２倍した値が、前記Ｘ線遮蔽部材７ａ
のピッチＡの整数倍となるように偏心量を決定すれば良
い。According to such a configuration, the eccentric pin 23 is
When the motor 21 rotates around the axis of the motor 21 along with the rotation of the motor 21, the rotation reciprocates in the horizontal direction on the plane shown in the figure, and the confusion line removing grid 7 vibrates in the horizontal direction with the reciprocation. become. Therefore, the eccentricity of the eccentric pin 23 is 2
The double is the amount of movement of the confusion line removal grid 7 in the left-right direction, and the value obtained by doubling the eccentricity is the X-ray shielding member 7a.
The amount of eccentricity may be determined so as to be an integral multiple of the pitch A.
【００２３】尚、上記図３又は図４に示した振動装置８
に限定されるものではなく、この他の構成で錯乱線除去
グリッド７を振動させる構成であっても良いことは明ら
かである。また、上記の実施形態では、Ｘ線イメージイ
ンテシファイヤ２とテレビジョンカメラ３との組み合わ
せからなるＸ線平面検出器を用いたシステムとしたが、
ＴＦＴ（薄膜トランジスタ）をスイッチングゲートとし
て使用したＸ線平面検出器を用いたシステムにおいて
も、同様にして錯乱線除去グリッド７を振動させること
で、上記システムと同様な効果が得られる。更に、１次
元に配列された画素に分けてＸ線像を撮像するシステム
であっても良い。The vibration device 8 shown in FIG. 3 or FIG.
It is obvious that the present invention is not limited to this, and that the confusion line removing grid 7 may be vibrated in another configuration. Further, in the above-described embodiment, the system using the X-ray flat panel detector composed of the combination of the X-ray image intensifier 2 and the television camera 3 is described.
In a system using an X-ray flat panel detector using a TFT (thin film transistor) as a switching gate, the same effect as the above system can be obtained by vibrating the confusion line removing grid 7 in the same manner. Further, a system that captures an X-ray image by dividing the pixels into one-dimensionally arranged pixels may be used.
【００２４】[0024]
【発明の効果】本発明は以上のように、Ｘ線曝射期間中
に錯乱線除去グリッドをＸ線遮断部材のピッチに関連づ
けて振幅を設定してピッチ方向に振動させる振動装置を
備える構成としたので、必要最小限の移動距離で錯乱線
除去グリッドを振動させてモアレ縞の発生を効果的に防
止することができるという効果がある。As described above, the present invention comprises a vibration device which vibrates in the pitch direction by setting the amplitude of the confusion line removing grid in relation to the pitch of the X-ray blocking member during the X-ray exposure period. Therefore, there is an effect that the occurrence of moiré fringes can be effectively prevented by vibrating the confusion line removing grid with a minimum necessary moving distance.
【図１】本発明にかかるＸ線診断装置の実施の形態にお
けるシステム構成を示すブロック図である。FIG. 1 is a block diagram showing a system configuration in an embodiment of an X-ray diagnostic apparatus according to the present invention.
【図２】錯乱線除去グリッドによるモアレ縞発生の様子
を説明するための図である。FIG. 2 is a diagram for explaining how moire fringes are generated by a confusion line removal grid.
【図３】振動装置の第１の実施形態を示す図である。FIG. 3 is a diagram showing a first embodiment of a vibration device.
【図４】振動装置の第２の実施形態を示す図である。FIG. 4 is a diagram showing a second embodiment of the vibration device.
１…Ｘ線管 ２…Ｘ線イメージインテシファイヤ ３…テレビジョンカメラ ４…光学系 ５…画像処理装置 ６…画像表示装置 ７…錯乱線除去グリッド ７ａ…Ｘ線遮蔽部材 ７ｂ…Ｘ線透過部材 ８…振動装置 ９…容器 10…被検体 DESCRIPTION OF SYMBOLS 1 ... X-ray tube 2 ... X-ray image intensifier 3 ... Television camera 4 ... Optical system 5 ... Image processing apparatus 6 ... Image display apparatus 7 ... Disturbance ray removal grid 7a ... X-ray shielding member 7b ... X-ray transmission member 8 Vibration device 9 Container 10 Subject
Claims (1)
と、前記被検体を透過したＸ線像を複数画素に分けて撮
像するＸ線検出器と、該Ｘ線検出器に入力する錯乱線を
除去すべく前記Ｘ線検出器のＸ線入射側に設けられた所
定ピッチ毎に板状のＸ線遮断部材を有する錯乱線除去グ
リッドと、前記Ｘ線管によるＸ線曝射期間中に前記錯乱
線除去グリッドを前記Ｘ線遮断部材のピッチに関連づけ
て振幅を設定して前記ピッチ方向に振動させる振動装置
と、を備えたことを特徴とするＸ線診断装置。1. An X-ray tube that irradiates an X-ray toward a subject, an X-ray detector that divides an X-ray image transmitted through the subject into a plurality of pixels, and captures the X-ray image. A disturbing line removing grid having plate-shaped X-ray blocking members provided at predetermined intervals on an X-ray incident side of the X-ray detector for removing input disturbing lines, and X-ray irradiation by the X-ray tube An X-ray diagnostic apparatus, comprising: a vibrating device that sets an amplitude in association with a pitch of the X-ray blocking member and vibrates the pitch in the pitch direction during a period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10091274A JPH11285486A (en) | 1998-04-03 | 1998-04-03 | Radiographic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10091274A JPH11285486A (en) | 1998-04-03 | 1998-04-03 | Radiographic apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11285486A true JPH11285486A (en) | 1999-10-19 |
Family
ID=14021887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10091274A Pending JPH11285486A (en) | 1998-04-03 | 1998-04-03 | Radiographic apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11285486A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001340331A (en) * | 2000-06-06 | 2001-12-11 | Shimadzu Corp | Radiographic device |
| US6480574B2 (en) * | 2001-03-16 | 2002-11-12 | Kabushiki Kaisha Toshiba | X-ray diagnostic apparatus |
| JP2003093375A (en) * | 2001-09-21 | 2003-04-02 | Canon Inc | Imager and imaging method |
| JP2007130460A (en) * | 2005-11-07 | 2007-05-31 | Siemens Ag | Grid for removing scattered x-ray and x-ray equipment |
| KR101593919B1 (en) | 2014-08-22 | 2016-02-16 | (주)디알젬 | Device of moving grid for x-ray imaging apparatus |
-
1998
- 1998-04-03 JP JP10091274A patent/JPH11285486A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001340331A (en) * | 2000-06-06 | 2001-12-11 | Shimadzu Corp | Radiographic device |
| US6480574B2 (en) * | 2001-03-16 | 2002-11-12 | Kabushiki Kaisha Toshiba | X-ray diagnostic apparatus |
| JP2003093375A (en) * | 2001-09-21 | 2003-04-02 | Canon Inc | Imager and imaging method |
| JP4695795B2 (en) * | 2001-09-21 | 2011-06-08 | キヤノン株式会社 | Imaging apparatus and imaging method |
| JP2007130460A (en) * | 2005-11-07 | 2007-05-31 | Siemens Ag | Grid for removing scattered x-ray and x-ray equipment |
| KR101593919B1 (en) | 2014-08-22 | 2016-02-16 | (주)디알젬 | Device of moving grid for x-ray imaging apparatus |
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