JPH0767444B2 - Radiation receiver - Google Patents
Radiation receiverInfo
- Publication number
- JPH0767444B2 JPH0767444B2 JP62014503A JP1450387A JPH0767444B2 JP H0767444 B2 JPH0767444 B2 JP H0767444B2 JP 62014503 A JP62014503 A JP 62014503A JP 1450387 A JP1450387 A JP 1450387A JP H0767444 B2 JPH0767444 B2 JP H0767444B2
- Authority
- JP
- Japan
- Prior art keywords
- radiation
- sensor array
- frequency
- image
- high voltage
- 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
- 230000005855 radiation Effects 0.000 title claims description 31
- 238000000034 method Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 102100027340 Slit homolog 2 protein Human genes 0.000 description 1
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
- X-Ray Techniques (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は放射線受像装置に関するものである。TECHNICAL FIELD The present invention relates to a radiation image receiving device.
従来の技術 センサアレイを高速で走査し、二次元画像を得る装置に
おいて、被検体に照射される放射線の均一性が、画像を
決定する重要な因子となる。従来、照射放射線の均一性
を補正する方法としては、照射放射線量をモニタ検出器
で測定し、モニタ検出器の出力信号、例えば電流値など
の相対変化率を使って補正していく方法が行なわれてい
る。2. Description of the Related Art In a device that scans a sensor array at high speed to obtain a two-dimensional image, the uniformity of radiation applied to a subject is an important factor for determining the image. Conventionally, as a method for correcting the uniformity of irradiation radiation, a method has been used in which the irradiation dose is measured by a monitor detector and the output signal of the monitor detector, for example, the relative change rate of the current value is used for correction. Has been.
発明が解決しようとする問題点 高精度な放射線透過画像を得ようとする場合、従来のよ
うに照射放射線量のみの補正では、照射放射線エネルギ
の補正が出来ないため、管電圧のリップルに起因する誤
差が画像を悪化させる。Problems to be Solved by the Invention When a highly accurate radiation transmission image is to be obtained, it is not possible to correct the irradiation radiation energy by correcting only the irradiation radiation amount as in the conventional case, which is caused by the ripple of the tube voltage. The error makes the image worse.
本発明は、この問題を解決するため各走査における照射
放射線のエネルギの分布を均一ならしめる方法を与える
ことを目的とするものである。It is an object of the present invention to provide a method for solving this problem by making the energy distribution of irradiation radiation uniform in each scan.
問題点を解決するための手段 この目的を達成するため本発明は放射線を発生する電源
の周波数がセンサアレイを走査する周波数の整数倍にな
るようにするものである。Means for Solving the Problems In order to achieve this object, the present invention provides that the frequency of a power supply that generates radiation is an integral multiple of the frequency at which a sensor array is scanned.
作用 被検体を透過する放射線には、電源の昇圧周波数に起因
した電圧リップルが存在している。放射線発生装置によ
り発生される放射線の量とエネルギは、この電圧リップ
ルにより大きく変化する。このため、リップル１周期で
の多数回のサンプリング走査を行なうと、各サンプリン
グ走査における放射線の変化はきわめて大きくなる。一
方電圧リップルは各々の放射線発生装置でほぼ一定の形
状の繰返し波形となるため、電源の周波数をセンサアレ
イの走査の周波数と同一にするか、あるいは整数倍にす
ることにより各走査において、きわめて安定し、かつ均
一な照射を行なうことが出来る。Action The radiation that passes through the subject has a voltage ripple due to the boosting frequency of the power supply. The amount and energy of the radiation generated by the radiation generator changes greatly due to this voltage ripple. Therefore, when a large number of sampling scans are performed in one ripple cycle, the radiation change in each sampling scan becomes extremely large. On the other hand, since the voltage ripple has a repetitive waveform of a substantially constant shape in each radiation generator, it is extremely stable in each scan by making the frequency of the power supply the same as the frequency of the scan of the sensor array or by making it an integral multiple. In addition, uniform irradiation can be performed.
実施例 本発明の一実施例を図に示す。Ｘ線管１から出射される
放射線はスリット２で扇状のビームに絞られ、被検体３
に照射される。被検体３を透過した放射線は、センサア
レイ４で検知され、各画素の信号が画像処理装置９に送
られる。一回のサンプリング走査が完了するとセンサア
レイ４は被検体３に対して相対的に移動し、次の測定を
行なう。この動作を繰返して、二次元画像情報を得て、
画像処理装置９にて、断層像や透過像を得る。Ｘ線管１
は、高電圧が供給されることにより、印加電圧に対応し
たＸ線を発生する。Ｘ線１に供給される高電圧は、商用
電源11（単相でも三相でも良い）を整流回路７で整流
し、次にDDコンバータ６で電圧制御を行なう。そして、
スイッチング方式高電圧発生回路５で昇圧を行ないＸ線
管１に高電圧を供給する。スイッチング方式高電圧発生
回路５のスイッチング信号10はタイミング発生器８より
供給され、画像信号の走査のタイミングと同期されてい
る。スイッチング方式高電圧発生回路５へは、画像信号
の走査の周波数の整数倍の周波数を入力出来るようにな
っている。Embodiment An embodiment of the present invention is shown in the drawing. Radiation emitted from the X-ray tube 1 is focused into a fan-shaped beam by the slit 2 and
Is irradiated. The radiation transmitted through the subject 3 is detected by the sensor array 4, and the signal of each pixel is sent to the image processing device 9. When one sampling scan is completed, the sensor array 4 moves relative to the subject 3 and performs the next measurement. Repeat this operation to obtain two-dimensional image information,
The image processing device 9 obtains a tomographic image and a transmission image. X-ray tube 1
Is supplied with a high voltage to generate X-rays corresponding to the applied voltage. The high voltage supplied to the X-ray 1 is rectified by the rectifier circuit 7 using the commercial power supply 11 (which may be single-phase or three-phase), and then the DD converter 6 performs voltage control. And
The switching type high voltage generating circuit 5 boosts the voltage to supply a high voltage to the X-ray tube 1. The switching signal 10 of the switching type high voltage generating circuit 5 is supplied from the timing generator 8 and is synchronized with the timing of scanning the image signal. A frequency that is an integral multiple of the scanning frequency of the image signal can be input to the switching system high voltage generation circuit 5.
本実施例ではタイミング発生器８により、高電圧発生回
路５と画像処理装置９に信号を送るように設計されてい
るが、画像処理装置９から、直接高電圧発生回路５に信
号を送ることも可能である。また、センサアレイ４の駆
動位置との同期なども本発明に含まれる。In the present embodiment, the timing generator 8 is designed to send a signal to the high voltage generation circuit 5 and the image processing device 9, but it is also possible to send a signal directly from the image processing device 9 to the high voltage generation circuit 5. It is possible. The present invention also includes synchronization with the drive position of the sensor array 4.
さらに、本実施例では、高電圧発生回路５にスイッチン
グ信号を送ることとしたが、逆に高電圧電源のリップル
を検知する回路を付加し、これよりの信号により、セン
サアレイの走査を制御することも可能である。Further, in the present embodiment, the switching signal is sent to the high voltage generation circuit 5, but a circuit for detecting the ripple of the high voltage power source is added on the contrary, and the scanning of the sensor array is controlled by the signal from this. It is also possible.
また、本実施例ではＸ線管についてであったが、放射線
発生器としては、ベータトロンやリニアックなど、パル
ス状や脈動しつつ放射線を発生する放射線を発生する放
射線発生器を使った装置への適用も可能である。Further, although the X-ray tube is used in this embodiment, the radiation generator may be a device using a radiation generator that generates radiation such as betatron or linac, which emits radiation while pulsating or pulsating. Application is also possible.
本発明は、商用周波数では得にくい500Hz以上の高速走
査において、特に効果が大きくなる。The present invention is particularly effective in high-speed scanning of 500 Hz or higher, which is difficult to obtain at commercial frequencies.
発明の効果 本発明により、非常に簡単な構造でセンサアレイの各走
査における照射放射線の線量とエネルギ分布の均一化が
図られるため、特にエネルギ・サブトラクション画像な
どの放射線のエネルギ情報を使う高度な放射線受像法に
おいても安価な装置で高精度に実現出来るため、放射線
画像技術の貢献に寄与することが大きい。EFFECTS OF THE INVENTION According to the present invention, since the dose and energy distribution of the irradiation radiation in each scan of the sensor array can be made uniform with a very simple structure, particularly high-level radiation using energy information of radiation such as energy subtraction image. Even in the image receiving method, since it can be realized with high precision by an inexpensive device, it greatly contributes to the contribution of the radiation image technology.
図は本発明の一実施例における放射線受像装置の構成図
である。 １……Ｘ線管、２……スリット、３……被検体、４……
センサアレイ、５……スイッチング方式高電圧発生回
路、６……DDコンバータ、７……整流回路、８……タイ
ミング発生器、９……画像処理装置。FIG. 1 is a block diagram of a radiation image receiving apparatus according to an embodiment of the present invention. 1 ... X-ray tube, 2 ... Slit, 3 ... Subject, 4 ...
Sensor array, 5 ... Switching type high voltage generator, 6 ... DD converter, 7 ... Rectifier circuit, 8 ... Timing generator, 9 ... Image processing device.
Claims (2)
配置されたセンサアレイで検知し、前記センサアレイを
被検体に対して相対的に走査して、二次元画像を得る放
射線受像装置であって、放射線を発生する電源の周波数
が前記センサアレイを走査する周波数の整数倍であるこ
とを特徴とする放射線受像装置。1. A radiation receiving apparatus for detecting a radiation transmitted through a subject with a linear or planar sensor array and scanning the sensor array relative to the subject to obtain a two-dimensional image. The radiation receiving apparatus is characterized in that a frequency of a power source for generating radiation is an integral multiple of a frequency for scanning the sensor array.
上であることを特徴とする特許請求の範囲第１項記載の
放射線受像装置。2. The radiation receiving apparatus according to claim 1, wherein the frequency of a power source that generates radiation is 500 Hz or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62014503A JPH0767444B2 (en) | 1987-01-23 | 1987-01-23 | Radiation receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62014503A JPH0767444B2 (en) | 1987-01-23 | 1987-01-23 | Radiation receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63181739A JPS63181739A (en) | 1988-07-26 |
| JPH0767444B2 true JPH0767444B2 (en) | 1995-07-26 |
Family
ID=11862863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62014503A Expired - Lifetime JPH0767444B2 (en) | 1987-01-23 | 1987-01-23 | Radiation receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0767444B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382508A (en) * | 2007-09-05 | 2009-03-11 | 同方威视技术股份有限公司 | Apparatus and method for checking contraband in air-freight service container |
| CN101382507A (en) * | 2007-09-05 | 2009-03-11 | 同方威视技术股份有限公司 | Apparatus for checking contraband in air-freight service container |
-
1987
- 1987-01-23 JP JP62014503A patent/JPH0767444B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63181739A (en) | 1988-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4570263A (en) | Tomographic x-ray apparatus for the production of transverse layer images | |
| US3924133A (en) | Device for measuring density of substances by penetrating rays | |
| JP2005021682A (en) | X-ray generator for ct system and slip ring | |
| WO1993021826A1 (en) | System for selective material imaging | |
| US4168436A (en) | Computed tomography | |
| JP2004136021A (en) | Concentrated irradiation type radiotherapy apparatus | |
| KR890001874B1 (en) | Apparatus for x-ray tomography | |
| US4345158A (en) | Tomographic apparatus for the production of transverse layer images | |
| JPH0767444B2 (en) | Radiation receiver | |
| JPH0725922Y2 (en) | Computer tomograph | |
| US4464775A (en) | Method and apparatus for collecting X-ray absorption data in X-ray computed tomography apparatus | |
| JPS60160599A (en) | Tomograph | |
| JPS5822854B2 (en) | Kadenriyuushisousakenbikiyou | |
| JP4828970B2 (en) | X-ray CT apparatus and control method of X-ray CT apparatus | |
| JPS63203137A (en) | X-ray ct apparatus | |
| JPH0576524A (en) | X-ray ct device | |
| JPS6114817B2 (en) | ||
| KR850001490B1 (en) | Radio diagnosis apparatus | |
| JPS62172698A (en) | X-ray computer tomography device | |
| JP2612059B2 (en) | Radiotherapy equipment | |
| JPH0351041A (en) | Radiation ct device | |
| JPH0938074A (en) | Focal point data obtaining method for x-ray ct device and x-ray ct device | |
| JPH03295541A (en) | X-ray diagnostic device | |
| JPS62122636A (en) | X-ray ct apparatus | |
| JPS63115540A (en) | Apparatus for measuring mineral amount of bone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |