JPS6255129B2 - - Google Patents
Info
- Publication number
- JPS6255129B2 JPS6255129B2 JP57147057A JP14705782A JPS6255129B2 JP S6255129 B2 JPS6255129 B2 JP S6255129B2 JP 57147057 A JP57147057 A JP 57147057A JP 14705782 A JP14705782 A JP 14705782A JP S6255129 B2 JPS6255129 B2 JP S6255129B2
- Authority
- JP
- Japan
- Prior art keywords
- phosphor film
- stimulable phosphor
- image
- electron beam
- scanning
- 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
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 46
- 230000003287 optical effect Effects 0.000 claims description 21
- 238000010894 electron beam technology Methods 0.000 claims description 14
- 230000005855 radiation Effects 0.000 claims description 13
- 230000001443 photoexcitation Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 description 17
- 230000010287 polarization Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 150000001552 barium Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000005365 phosphate glass Substances 0.000 description 1
- 125000002467 phosphate group Chemical class [H]OP(=O)(O[H])O[*] 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Radiation (AREA)
- Radiography Using Non-Light Waves (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、蓄積性螢光体膜を用いて二次元放射
線像を撮像する放射線検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a radiation detection device that captures a two-dimensional radiation image using a stimulable phosphor film.
従来、蓄積性螢光体膜を用いて放射線像の撮
像、再生を行うシステムとして、第１図に示すも
のが知られている（特開昭56−11393号公報，特
開昭56−11397号公報参照）。第１図ａは撮像状態
を示しており、Ｘ線管１からのＸ線を被検体２に
照射し、その透過Ｘ線像を蓄積性螢光体膜３に記
録する。第１図ｂはこの蓄積性螢光体膜３に蓄積
記録されたＸ線像を光励起により再生する状態を
示している。即ちHe−Neレーザ４からのレーザ
ビームを偏向装置５により偏向走査すると同時
に、Ｘ線像が記録された蓄積性螢光体膜３をレー
ザビームの走査方向とは直交する方向（図示矢印
方向）に駆動する。これにより蓄積性螢光体膜３
の各点から光励起により発せられたＸ線照射量に
対応する強さの光を集光シート５により集光して
光電子増倍管７に順次導く。光電子増倍管７の出
力はデータ処理装置８に導かれ、電気的処理がな
されて画像表示装置９に再生像が表示されること
になる。
Conventionally, as a system for capturing and reproducing radiation images using a stimulable phosphor film, the system shown in FIG. (see official bulletin). FIG. 1a shows an imaging state in which X-rays from an X-ray tube 1 are irradiated onto a subject 2, and the transmitted X-ray image is recorded on a stimulable phosphor film 3. FIG. 1b shows a state in which the X-ray image stored and recorded on the stimulable phosphor film 3 is reproduced by optical excitation. That is, the laser beam from the He-Ne laser 4 is deflected and scanned by the deflection device 5, and at the same time, the stimulable phosphor film 3 on which the X-ray image is recorded is scanned in a direction perpendicular to the scanning direction of the laser beam (in the direction of the arrow in the figure). Drive to. As a result, the stimulable phosphor film 3
Light having an intensity corresponding to the amount of X-ray irradiation emitted by photoexcitation from each point is focused by a light-condensing sheet 5 and guided sequentially to a photomultiplier tube 7 . The output of the photomultiplier tube 7 is guided to a data processing device 8, where it is electrically processed and a reproduced image is displayed on an image display device 9.
しかしながら、このような従来のシステムには
次のような問題があつた。 However, such conventional systems have the following problems.
第１に、蓄積性螢光体膜の放射線像再生のため
の光励起に当つては、偏向装置や蓄積性螢光体膜
の駆動など機械的走査手段を必要とするため、再
生時間の短縮化が難しい。第２に、同様の理由か
ら蓄積性螢光体膜とその光励起システム部の一体
化が難しく、蓄積性螢光体膜は放射線像記録後に
付属する再生装置に改めてかけなければならず、
従つて放射線像の画像処理の即時性に欠ける。 First, optical excitation for reproducing the radiation image of the stimulable phosphor film requires mechanical scanning means such as a deflection device and driving the stimulable phosphor film, so the reproduction time can be shortened. is difficult. Secondly, for the same reason, it is difficult to integrate the stimulable phosphor film and its optical excitation system, and the stimulable phosphor film must be reapplied to the attached reproducing device after recording the radiation image.
Therefore, the immediacy of image processing of radiographic images is lacking.
本発明は、機械的走査手段を用いることなく蓄
積性螢光体膜の光励起を行うことにより、放射線
像の再生時間の短縮を図り、画像処理に即時性を
持たせることも可能とした放射線検出装置を提供
することを目的とする。
The present invention aims at shortening the reproduction time of a radiation image by optically exciting a stimulable phosphor film without using mechanical scanning means, and enables radiation detection to provide immediacy to image processing. The purpose is to provide equipment.
〔発明の概要〕
本発明においては、放射線像を撮像する蓄積性
螢光体膜に対して、電子ビームの衝撃によりこの
蓄積性螢光体膜を光励起するために有効な波長成
分の光を発する光励起用螢光体膜を対向配置す
る。そしてこの光励起用螢光体膜を電子ビームで
走査し、この光励起用螢光体膜からの光を光学系
で集光して蓄積性螢光体膜を走査して順次光励起
を行い、蓄積性螢光体膜の各点から発せられる光
を光検出器によつて順次検出するように構成す
る。[Summary of the Invention] In the present invention, a stimulable phosphor film for capturing a radiation image is bombarded with an electron beam to emit light with a wavelength component effective for optically exciting the stimulable phosphor film. The phosphor films for optical excitation are arranged to face each other. Then, this photoexcitation phosphor film is scanned with an electron beam, and the light from this photoexcitation phosphor film is focused by an optical system to scan the stimulable phosphor film to sequentially perform photoexcitation. The light emitted from each point of the phosphor film is sequentially detected by a photodetector.
本発明によれば、機械的走査手段を用いないが
ら蓄積性螢光体膜とその光励起システム部分の一
体化が容易になる。また蓄積性螢光体膜の放射線
像再生時における光励起は電子ビームにより電気
的に行われるので像再生時間が短縮され、画像処
理に即時性を持たせることが可能となる。
The present invention facilitates the integration of a stimulable phosphor film and its optical excitation system portion without using mechanical scanning means. Furthermore, since the optical excitation of the stimulable phosphor film during radiation image reproduction is electrically performed by an electron beam, the image reproduction time is shortened, and image processing can be performed with immediacy.
本発明の実施例を第２図を参照して説明する。
図において、１１はＸ線管であり、これから放射
されたフアンビームＸ線１２は被検体１３に照射
され、その透過Ｘ線像が蓄積性螢光体膜１４に記
録される。蓄積性螢光体膜１４は光励起によりＸ
線照射量に対応する強さの光を発するものであ
る。蓄積性螢光体膜１４の背後には光励起用螢光
体膜１５が配置されている。この光励起用螢光体
膜１５はガラス真空容器１６のフエースプレート
内面に塗布されており、真空容器１６内には電子
銃１７と、この電子銃１７からの電子ビーム２０
を偏光走査するための水平偏光電極１８１，１８
２および垂直偏向電極１９１，１９２が封入され
ている。つまりこの真空容器１６はいわば陰極線
走査管を構成している。光励起用螢光体膜１５
は、電子ビーム２０の走査により蓄積性螢光体膜
１４を光励起するために有効な波長成分を有する
光を発するものである。光励起用螢光体膜１５と
蓄積性螢光体膜１４の間には集光光学系２２が設
けられ、電子ビーム２０の走査により光励起用螢
光体膜１５が発する励起光２１を蓄積性螢光体膜
１４上に集光して、これを順次走査励起するよう
になつている。２３は蓄積性螢光体膜１４が光励
起されて発する、Ｘ線像の各点からの光を検知し
て電気信号に変換する電子増倍管である。電子増
倍管２３の前面には波長選択性光学フイルタ２４
をおいて励起光２１を分離し、蓄積性螢光体膜１
４が発する光を選択的に検知してこれを増幅器２
５を介してデータ処理装置２７に送り込む。デー
タ処理装置２７は、電子ビームの偏向走査を制御
する掃引回路２６からの同期信号を得て入力され
たＸ線像データの画像処理を行う。被検体１３の
透過Ｘ線像の再生像は画像表示装置２８に表示さ
れることになる。
An embodiment of the present invention will be described with reference to FIG.
In the figure, reference numeral 11 denotes an X-ray tube. Fan beam X-rays 12 emitted from the tube are irradiated onto a subject 13, and the transmitted X-ray image is recorded on a stimulable phosphor film 14. The stimulable phosphor film 14 emits
It emits light with an intensity corresponding to the amount of radiation. A phosphor film 15 for optical excitation is disposed behind the stimulable phosphor film 14 . This phosphor film 15 for optical excitation is coated on the inner surface of the face plate of a glass vacuum container 16, and inside the vacuum container 16 there is an electron gun 17 and an electron beam 20 emitted from the electron gun 17.
Horizontal polarization electrodes 18 1 , 18 for polarization scanning
2 and vertical deflection electrodes 19 1 and 19 2 are enclosed. In other words, this vacuum vessel 16 constitutes a so-called cathode ray scanning tube. Fluorescent film 15 for optical excitation
The electron beam 20 emits light having a wavelength component effective for optically exciting the stimulable phosphor film 14 by scanning with the electron beam 20. A condensing optical system 22 is provided between the phosphor film 15 for optical excitation and the stimulable phosphor film 14, and the excitation light 21 emitted by the phosphor film 15 for optical excitation is collected by the stimulable phosphor film 14 by scanning the electron beam 20. The light is focused on the light body film 14 and is sequentially scanned and excited. Reference numeral 23 denotes an electron multiplier tube that detects the light emitted from each point of the X-ray image when the stimulable phosphor film 14 is excited and converts it into an electrical signal. A wavelength selective optical filter 24 is installed in front of the electron multiplier tube 23.
The excitation light 21 is separated from the stimulable phosphor film 1.
4 selectively detects the light emitted by amplifier 2.
5 to the data processing device 27. The data processing device 27 receives a synchronization signal from the sweep circuit 26 that controls the deflection and scanning of the electron beam, and performs image processing on the input X-ray image data. A reproduced image of the transmitted X-ray image of the subject 13 is displayed on the image display device 28.
蓄積性螢光体膜１４としては例えば、希土類元
素付活バリウムフルオロハライドやAg活性化リ
ン酸ガラスを用いる。前者の場合、光励起用螢光
体膜１５としては、波長630nm付近に発光ピーク
を有するもの、例えば主成分Zn〔PO4〕2〔Mn〕
を含む螢光体膜を用い、後者の場合には波長
360nm付近に発光ピークを有するもの、例えば主
成分Ca2Mg・Si2O7〔Ge〕を含む螢光体膜を用い
る。そして光学フイルタ２４としては、前者の場
合波長300〜400nm、後者の場合波長500〜700nm
を選択的に透過するものを用いればよい。 As the stimulable phosphor film 14, for example, rare earth element-activated barium fluorohalide or Ag-activated phosphate glass is used. In the former case, the phosphor film 15 for photoexcitation has an emission peak around a wavelength of 630 nm, for example, the main component is Zn [PO 4 ] 2 [Mn].
In the latter case, the wavelength
A phosphor film having an emission peak around 360 nm, for example, containing Ca 2 Mg·Si 2 O 7 [Ge] as a main component, is used. The optical filter 24 has a wavelength of 300 to 400 nm in the former case, and a wavelength of 500 to 700 nm in the latter case.
What is necessary is to use a material that selectively transmits.
こうしてこの実施例によれば、蓄積性螢光体膜
とその光励起システム部を一体化すると共に機械
的可動部分をなくして、蓄積性螢光体膜にＸ線像
を蓄積記録し、これを電子ビーム走査を利用した
いわゆる飛点走査によつて電気信号として読出
し、再生することができる。また、蓄積性螢光体
膜のＸ線像再生時における光励起は電子ビームに
より電気的に行われることから、Ｘ線像の再生時
間が短縮され、画像処理に即時性を持たせること
ができる。例えばＸ線テレビカメラとそのビデオ
信号のデイジタル画像処理を組合せた各種診断シ
ステムが実用されているが、本発明をこれらの診
断システムに適用することができる。即ち像再生
時間が短いので、パルスイメージモード（数コマ
１秒の間欠Ｘ線曝射に同期してサブストラクシヨ
ン像を作り、その像を順次重ね合わせることによ
り一枚のサブストラクシヨン像を完成させる）
や、その他コンテイニユアスモード、TIDモード
等として知られたデイジタル画像処理が容易に実
行できる。従つて本発明により、上記診断システ
ムの簡略化を図ることができる。 Thus, according to this embodiment, the stimulable phosphor film and its optical excitation system are integrated, and mechanically movable parts are eliminated. It can be read out and reproduced as an electrical signal by so-called flying spot scanning using beam scanning. In addition, since optical excitation of the stimulable phosphor film during X-ray image reproduction is performed electrically by an electron beam, the X-ray image reproduction time can be shortened and image processing can be performed with immediacy. For example, various diagnostic systems that combine an X-ray television camera and digital image processing of its video signal are in use, and the present invention can be applied to these diagnostic systems. In other words, since the image reproduction time is short, pulse image mode (substructural images are created in synchronization with intermittent X-ray exposure of several frames per second, and the images are successively superimposed to complete one substructural image. )
Digital image processing known as continuous mode, TID mode, etc. can be easily performed. Therefore, according to the present invention, the above-mentioned diagnostic system can be simplified.
なお本発明は上記実施例に限られるものではな
い。例えば、光検出器として光電子増倍管の他に
ホトダイオードなどを用いることができる。また
電子ビームの偏向方式として静電偏光形でなく電
磁偏向形を用いてもよい。 Note that the present invention is not limited to the above embodiments. For example, in addition to a photomultiplier tube, a photodiode or the like can be used as a photodetector. Further, as the electron beam deflection method, an electromagnetic deflection type may be used instead of an electrostatic polarization type.
第１図ａ，ｂは従来の蓄積性螢光体膜を用いた
Ｘ線像撮像および再生システムを示す図、第２図
は本発明の一実施例のＸ線像撮像および再生シス
テムを示す図である。
１１……Ｘ線管、１２……フアンビームＸ線、
１３……被検体、１４……蓄積性螢光体膜、１５
……光励起用螢光体膜、１６……ガラス真空容
器、１７……電子銃、１８１，１８２，１９１，
１９２……偏向電極、２０……電子ビーム、２１
……励起光、２２……集光光学系、２３……電子
増倍管、２４……波長選択性光学フイルタ、２５
……増幅器、２６……掃引回路、２７……データ
処理装置、２８……画像表示装置。
FIGS. 1a and 1b show a conventional X-ray image capturing and reproducing system using a stimulable phosphor film, and FIG. 2 shows an X-ray image capturing and reproducing system according to an embodiment of the present invention. It is. 11...X-ray tube, 12...Fan beam X-ray,
13... Subject, 14... Accumulative phosphor film, 15
...phosphor film for optical excitation, 16 ... glass vacuum container, 17 ... electron gun, 18 1 , 18 2 , 19 1 ,
19 2 ... Deflection electrode, 20... Electron beam, 21
... Excitation light, 22 ... Condensing optical system, 23 ... Electron multiplier tube, 24 ... Wavelength selective optical filter, 25
... amplifier, 26 ... sweep circuit, 27 ... data processing device, 28 ... image display device.
Claims (1)
照射量に対応する強さの光を発する蓄積性螢光体
膜と、電子ビームの衝撃によりこの蓄積性螢光体
膜を光励起するために有効な波長成分を有する光
を発する光励起用螢光体膜と、この光励起用螢光
体膜を電子ビームで走査する手段と、前記光励起
用螢光体膜から発せられる光を集光して前記蓄積
性螢光体膜を走査するための光学系と、前記蓄積
性螢光体膜から発せられる光を検出する光検出器
とを備えたことを特徴とする放射線検出装置。1. A stimulable phosphor film that emits light with an intensity corresponding to the amount of radiation irradiated by photoexcitation after radiation irradiation, and a wavelength component that is effective for photoexciting this stimulable phosphor film by the impact of an electron beam. a phosphor film for photoexcitation that emits light, a means for scanning the phosphor film for photoexcitation with an electron beam, and a means for scanning the phosphor film for photoexcitation with an electron beam; A radiation detection device comprising: an optical system for scanning a film; and a photodetector for detecting light emitted from the stimulable phosphor film.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57147057A JPS5936243A (en) | 1982-08-25 | 1982-08-25 | Radiation detector |
| DE8383304763T DE3378864D1 (en) | 1982-08-25 | 1983-08-17 | Storage & reconstruction apparatus for radiation image |
| EP83304763A EP0102790B1 (en) | 1982-08-25 | 1983-08-17 | Storage & reconstruction apparatus for radiation image |
| US06/526,465 US4598207A (en) | 1982-08-25 | 1983-08-25 | Storage and reconstruction apparatus for radiation image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57147057A JPS5936243A (en) | 1982-08-25 | 1982-08-25 | Radiation detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5936243A JPS5936243A (en) | 1984-02-28 |
| JPS6255129B2 true JPS6255129B2 (en) | 1987-11-18 |
Family
ID=15421516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57147057A Granted JPS5936243A (en) | 1982-08-25 | 1982-08-25 | Radiation detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5936243A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006343673A (en) * | 2005-06-10 | 2006-12-21 | Rigaku Corp | X-ray image reading apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5549754A (en) * | 1991-04-30 | 1996-08-27 | Murata Manufacturing Co., Ltd. | Lead frame holder |
-
1982
- 1982-08-25 JP JP57147057A patent/JPS5936243A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006343673A (en) * | 2005-06-10 | 2006-12-21 | Rigaku Corp | X-ray image reading apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5936243A (en) | 1984-02-28 |
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