JPS61155884A - Gamma camera detector - Google Patents
Gamma camera detectorInfo
- Publication number
- JPS61155884A JPS61155884A JP27472784A JP27472784A JPS61155884A JP S61155884 A JPS61155884 A JP S61155884A JP 27472784 A JP27472784 A JP 27472784A JP 27472784 A JP27472784 A JP 27472784A JP S61155884 A JPS61155884 A JP S61155884A
- Authority
- JP
- Japan
- Prior art keywords
- photomultiplier tube
- light
- opening
- scintillator
- gamma camera
- 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
Landscapes
- Measurement Of Radiation (AREA)
- Nuclear Medicine (AREA)
Abstract
Description
【発明の詳細な説明】
E発明の技術分野〕
本発明は体内に投与したラジオアイソトープの2次元分
布を得るガンマカメラ検出器に関し、更には光電子増倍
管のゲインドリフトを補正する機能を有するガンマカメ
ラ検出器に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a gamma camera detector that obtains a two-dimensional distribution of radioisotopes administered into the body, and further relates to a gamma camera detector having a function of correcting gain drift of a photomultiplier tube. Regarding camera detectors.
[発明の技術的背景とその問題点]
ガンマカメラ検出器に用いられている光電子増倍管は長
時間使用していると、地磁気等の影響を受けてドリフト
が発生し、正確なラジオアイソトープの2次元分布を得
ることがむづかしくなる。[Technical background of the invention and its problems] When photomultiplier tubes used in gamma camera detectors are used for long periods of time, they tend to drift due to the influence of the earth's magnetism, making it difficult to accurately detect radioisotopes. It becomes difficult to obtain a two-dimensional distribution.
その為それを補正する必要がある。Therefore, it is necessary to correct it.
光電子増倍管のゲインドリフトを補正する場合、ある一
定周期で基準光を与え、その出力が一定値となるように
、光電子増倍管のゲインを変化させる必要がある。When correcting the gain drift of a photomultiplier tube, it is necessary to apply reference light at a certain period and change the gain of the photomultiplier tube so that its output becomes a constant value.
従来、この基準光の与え方としては光電子増倍W同志の
間に発光素子を組込むか、あるいは発光素子を組込んで
ある特殊な光電子倍増管を使用するかのいずれかであっ
た。Conventionally, this reference light has been provided either by incorporating a light emitting element between the photomultipliers W or by using a special photomultiplier tube incorporating a light emitting element.
しかし、前者の場合は構造的に複雑になるという問題が
、後者の場合は特殊なものを使用する為価格が高くなる
という問題があった。However, in the former case, there was a problem that the structure was complicated, and in the latter case, there was a problem that the price was high because special parts were used.
[発明の目的]
本発明は上記事情に鑑みてなされたもので、簡単な構造
で、ガンマカメラ本体を動かすことなく光電子増倍管の
ゲインドリフトを補正する機能を有するガンマカメラ検
出器を提供することを目的とする。[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a gamma camera detector that has a simple structure and has a function of correcting the gain drift of a photomultiplier tube without moving the gamma camera body. The purpose is to
[発明の概!!]
上記目的を達成する為に本発明は光電子増倍管とシンチ
レータとの間に、基準光を発光させる発光素子を具備し
たライトガイドとシンチレータからの光を透過またはし
ゃ断あるいは基準光を乱反射させる開閉手段とを設けた
ことを特徴とする。[Summary of the invention! ! ] In order to achieve the above object, the present invention provides a light guide equipped with a light emitting element that emits reference light between a photomultiplier tube and a scintillator, and an opening/closing system that transmits or blocks light from the scintillator or diffusely reflects the reference light. It is characterized by providing means.
[発明の実施例] 次に本発明の一実施例を図面を参照して説明する。[Embodiments of the invention] Next, one embodiment of the present invention will be described with reference to the drawings.
第1図、第2図において、体内に投与したラジオアイソ
トープからガンマ線1が発生する。In FIGS. 1 and 2, gamma rays 1 are generated from a radioisotope administered into the body.
ガンマカメラ検出器2はコリメータ3を有し、その上に
ガンマ線1が入光すると発光するシンチレータ4が載置
されている。更にその、ヒにはガラス5と周囲に基準光
を発光させる発光素子6を有するライトガイド7とが載
置れている。このライトガイド7内には外部からの信号
で透明、不透明に切り代る液晶からなる開閉手段8が組
込まれている。このライトガイド7の上部には六角稠密
に配列された光電子増倍管9が複数設けられている。The gamma camera detector 2 has a collimator 3, on which is placed a scintillator 4 that emits light when gamma rays 1 are incident thereon. Furthermore, a light guide 7 having a glass 5 and a light emitting element 6 that emits reference light around it is placed on the top. Built into the light guide 7 is an opening/closing means 8 made of liquid crystal that can be switched between transparent and opaque in response to an external signal. A plurality of hexagonally densely arranged photomultiplier tubes 9 are provided above the light guide 7.
前述の開閉手段8は光電子増倍管9の受光面に対向して
設けられている。尚、信号10は発光素子6を発光また
消光さ゛せる制御信号である。また、信号群11は複数
個ある開閉手段8を1個1個独立にあるいは一緒に開閉
させる制御信号群である。The aforementioned opening/closing means 8 is provided facing the light receiving surface of the photomultiplier tube 9. Note that the signal 10 is a control signal that causes the light emitting element 6 to emit or extinguish light. Further, the signal group 11 is a control signal group for opening and closing the plurality of opening/closing means 8 one by one or together.
次に上述の如く構成された本発明に係るガンマカメラ検
出器2の作用について説明する。Next, the operation of the gamma camera detector 2 according to the present invention configured as described above will be explained.
まず、通常のガンマカメラ検出器2の動作について述べ
る。まず信号群11により開閉手段8を開状態即ち透明
状態に保持し、かつ信号10により発光素子6を消光し
ておく。この状態において、体内に投与したラジオアイ
ソトープから発生したガンマ線1はコリメータ3を経て
シンチレータ4に入光する。ここで、シンチレータ4は
シンチレーションをおこし発光する。この光はガラス5
゜ライトガイド7を経て更に開閉手段8を透過して光電
子増倍管9に入り、この光電子増倍管9の出力信号によ
り位置計算を行い、ガンマ線の入射位置を求める。First, the operation of the normal gamma camera detector 2 will be described. First, the opening/closing means 8 is held in an open state, that is, a transparent state, by the signal group 11, and the light emitting element 6 is extinguished by the signal 10. In this state, gamma rays 1 generated from the radioisotope administered into the body enter the scintillator 4 via the collimator 3. Here, the scintillator 4 causes scintillation and emits light. This light is glass 5
After passing through the light guide 7, the light passes through the opening/closing means 8 and enters the photomultiplier tube 9, and the position is calculated based on the output signal of the photomultiplier tube 9 to determine the incident position of the gamma ray.
次に一定時間経過して光電子増倍管9のゲインドリフト
の補正を行う場合はまず信号群11により補正すべき光
電子増倍管9の1つに対向する開閉手段8の1つを閉状
態即ち不透明状態にしてシンチレータ4からの光を遮断
して、かつ信号10により発光素子6を発光させ、基準
信号を発光させる。この発光素子6からの基準信号はラ
イトガイド7内を通り、液晶からなる開閉手段8により
乱反射され補正すべき光電子増倍管9の受光面に入光す
る。この時閉状態になっている開閉手段8に対向して設
けられている光電子増倍管9にはシンチレータ4からの
光は殆んど入光しない。液晶かうなる開閉手段8の形を
工夫することにより各光電子増倍管9に入る基準光を等
しくできる。基準信号が入力した光電子増倍管9の出力
値を求め基準値と比較してゲインをコントロールし、ゲ
インドリフトの補正を行う。1つの光電子増倍管9のゲ
インドリフトの補正を終了すると信号群11を制御して
次に別の光電子増倍管9の補正を行う。Next, when correcting the gain drift of the photomultiplier tube 9 after a certain period of time has elapsed, first, one of the opening/closing means 8 facing one of the photomultiplier tubes 9 to be corrected is set to the closed state using the signal group 11. It is set in an opaque state to block light from the scintillator 4, and causes the light emitting element 6 to emit light in response to the signal 10, thereby causing the reference signal to emit light. The reference signal from the light emitting element 6 passes through the light guide 7, is diffusely reflected by the opening/closing means 8 made of liquid crystal, and enters the light receiving surface of the photomultiplier tube 9 to be corrected. At this time, almost no light from the scintillator 4 enters the photomultiplier tube 9 provided opposite the opening/closing means 8 which is in the closed state. By devising the shape of the liquid crystal opening/closing means 8, the reference light entering each photomultiplier tube 9 can be made equal. The output value of the photomultiplier tube 9 into which the reference signal is input is determined and compared with the reference value to control the gain and correct the gain drift. When the gain drift correction for one photomultiplier tube 9 is completed, the signal group 11 is controlled to correct another photomultiplier tube 9 next.
かくして順次光電子像信管9の補正を行うことができる
。In this way, the photoelectron image fuze 9 can be corrected sequentially.
あるいは信号群11を制御して全ての開閉装置8を同時
に開閉して光電子増倍管9全てを同時に補正することも
できるし、また一定の個数毎に補正することもできる。Alternatively, it is possible to control the signal group 11 to open and close all the switching devices 8 at the same time to correct all the photomultiplier tubes 9 at the same time, or it is also possible to correct each of the photomultiplier tubes in units of a fixed number.
[発明の効果]
以上述べた如く本発明によれば、開閉装置を外部からの
信号により開閉させることにより光電子増倍管の補正を
ガンマカメラ検出器本体を動かすことなく行うことがで
きる。[Effects of the Invention] As described above, according to the present invention, the photomultiplier tube can be corrected without moving the gamma camera detector main body by opening and closing the opening/closing device in response to an external signal.
更に、開閉装置をライトガイドに組込むことにより従来
のガンマカメラ検出器をそのまま使用することもできる
。Furthermore, by incorporating the opening/closing device into the light guide, a conventional gamma camera detector can be used as is.
また、開閉装置を光電子増倍管毎に対向して設けると、
光電子増倍管1つ1つについであるいは一定個数毎に補
正を行うことができ、また必要によっては、光電子増倍
管毎てを同時に補正することもできる。In addition, if a switching device is provided facing each photomultiplier tube,
Correction can be performed for each photomultiplier tube one by one or for a certain number of photomultiplier tubes, and if necessary, all photomultiplier tubes can be corrected at the same time.
第1図は本発明に係るガンマカメラ検出器の断面図、第
2図は第1図のI−M断面図である。
1・・・ガンマ線、2・・・ガンマカメラ検出器、3・
・・コリメータ、
4・・・シンチレータ、5・・・ガラス、6・・・発光
素子、7・・・ライトガイド、8・・・開閉手段、9・
・・光電子倍増管。
代理人 弁理士 則近憲佑(ほか1名)第2図FIG. 1 is a sectional view of a gamma camera detector according to the present invention, and FIG. 2 is a sectional view taken along line I-M in FIG. 1... Gamma ray, 2... Gamma camera detector, 3...
...Collimator, 4...Scintillator, 5...Glass, 6...Light emitting element, 7...Light guide, 8...Opening/closing means, 9...
...Photomultiplier tube. Agent: Patent attorney Kensuke Norichika (and 1 other person) Figure 2
Claims (4)
ータと、このシンチレータに対向してシンチレータから
の光を受光する光電子増倍管とからなり、この光電子増
倍管と前記シンチレータとの間に、基準光を発光させる
発光素子を具備したライトガイドとシンチレータからの
光を透過または遮蔽させる開閉手段とを設けたことを特
徴とするガンマカメラ検出器。(1) Consisting of a collimator, a scintillator that emits gamma rays, and a photomultiplier tube that faces this scintillator and receives light from the scintillator, and a reference light is provided between the photomultiplier tube and the scintillator. A gamma camera detector comprising a light guide equipped with a light emitting element that emits light and an opening/closing means that transmits or blocks light from a scintillator.
請求の範囲1項記載のガンマカメラ検出器。(2) The gamma camera detector according to claim 1, wherein the opening/closing means is a liquid crystal.
いることを特徴とする特許請求の範囲第1項記載のガン
マカメラ検出器。(3) The gamma camera detector according to claim 1, wherein the opening/closing means is incorporated within the light guide.
られていることを特徴とする特許請求の範囲第1項記載
のガンマカメラ検出器。(4) The gamma camera detector according to claim 1, wherein the opening/closing means is provided for each predetermined number of photomultiplier tubes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27472784A JPS61155884A (en) | 1984-12-28 | 1984-12-28 | Gamma camera detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27472784A JPS61155884A (en) | 1984-12-28 | 1984-12-28 | Gamma camera detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61155884A true JPS61155884A (en) | 1986-07-15 |
Family
ID=17545729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27472784A Pending JPS61155884A (en) | 1984-12-28 | 1984-12-28 | Gamma camera detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61155884A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10186045A (en) * | 1996-12-26 | 1998-07-14 | Canon Inc | Radiation detecting device and its method |
GB2325367A (en) * | 1997-04-25 | 1998-11-18 | Cintel Int Ltd | Stabilisation of photoelectric cells |
JP2009042233A (en) * | 2001-03-23 | 2009-02-26 | Koninkl Philips Electronics Nv | Method of determination of absorbed dosage by radiation sensor |
-
1984
- 1984-12-28 JP JP27472784A patent/JPS61155884A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10186045A (en) * | 1996-12-26 | 1998-07-14 | Canon Inc | Radiation detecting device and its method |
GB2325367A (en) * | 1997-04-25 | 1998-11-18 | Cintel Int Ltd | Stabilisation of photoelectric cells |
JP2009042233A (en) * | 2001-03-23 | 2009-02-26 | Koninkl Philips Electronics Nv | Method of determination of absorbed dosage by radiation sensor |
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