JPS6113982Y2 - - Google Patents
Info
- Publication number
- JPS6113982Y2 JPS6113982Y2 JP9949481U JP9949481U JPS6113982Y2 JP S6113982 Y2 JPS6113982 Y2 JP S6113982Y2 JP 9949481 U JP9949481 U JP 9949481U JP 9949481 U JP9949481 U JP 9949481U JP S6113982 Y2 JPS6113982 Y2 JP S6113982Y2
- Authority
- JP
- Japan
- Prior art keywords
- radiation source
- arm
- point
- driven wheel
- rotation
- 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
- 230000005855 radiation Effects 0.000 claims description 29
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
Description
【考案の詳細な説明】
この考案はポジトロンエミツシヨンCT装置の
較正用線源装置に関している。[Detailed description of the invention] This invention relates to a radiation source device for calibrating a positron emission CT device.
ポジトロンエミツシヨンCT装置において、計
測されたデータの吸収補正や検出器の相対感度の
補正をなすために、スキヤナは較正用線源装置を
組み込まれている。較正用線源装置として、点線
源がスライス面内にて被検体のまわりに回転させ
られるものは、均一な放射能をもつ線源を得るこ
とができて有利である。 In a positron emission CT system, the scanner is equipped with a radiation source device for calibration in order to correct the absorption of measured data and the relative sensitivity of the detector. As a calibration radiation source device, one in which a point radiation source is rotated around the subject within the slice plane is advantageous because it is possible to obtain a radiation source with uniform radioactivity.
本考案は点線源を用いた較正用線源装置に係
り、点線源の出し入れを確実かつ正確になすこと
ができ、しかも簡単な構造によつてこれを成し遂
げられるようにすることにある。 The present invention relates to a calibration radiation source device using a point radiation source, and an object of the present invention is to enable reliable and accurate insertion and removal of the point radiation source, and to achieve this with a simple structure.
本考案の較正用線源装置は、点線源と、点線源
をスライス面内の位置とスライス面から待避する
位置との間を移動させるために点線源を支持する
回転可能なアームと、アームを回転させるための
駆動手段とからなり、駆動手段がゼネバ機構を含
み、ゼネバ機構が駆動車の一回転にたいして従動
車を1/4回転させるものからなり、従動車をアー
ムの回転軸に偏心して取り付けてなること、を特
徴としている。 The calibration radiation source device of the present invention includes a point radiation source, a rotatable arm that supports the point radiation source in order to move the point radiation source between a position within the slice plane and a position where the point radiation source is evacuated from the slice plane, and the arm. The drive means includes a Geneva mechanism, and the Geneva mechanism rotates the driven wheel 1/4 rotation for one rotation of the driving wheel, and the driven wheel is mounted eccentrically to the rotating shaft of the arm. It is characterized by the fact that it becomes
以下、本考案の較正用線源装置の一実施例を、
添付図面にしたがつて説明する。 An example of the calibration radiation source device of the present invention is shown below.
This will be explained with reference to the attached drawings.
第１図および第２図において、１１は支持板、
１２はアーム、１３は点線源をそれぞれ示してい
る。各アームは一端を支持板に回転可能に取り付
けてある。点線源は各アームの他端、すなわち突
出側の端部に取り付けてあつて、支持板の表面か
ら突出する第一位置と支持板の表面に平行な第二
位置との間を移動できる。 In FIGS. 1 and 2, 11 is a support plate;
Reference numeral 12 indicates an arm, and reference numeral 13 indicates a point radiation source. Each arm is rotatably attached at one end to a support plate. A point radiation source is attached to the other end of each arm, ie, the protruding end, and is movable between a first position protruding from the surface of the support plate and a second position parallel to the surface of the support plate.
各アームは、第３図および第４図によく示され
ているように、端部に回転軸１４を固定してあ
る。他方、支持部材１５が支持板の表面に固定さ
れている。各アームは支持部材にある軸受１６に
回転軸を保持されることによつて、支持板に回転
可能に取り付けられている。また、駆動軸１７が
支持部材にある軸受１８に保持されている。ゼネ
バ機構２０がこれらの回転軸と駆動軸との間に配
設されている。ゼネバ機構は、公知のこの種のも
のと同様に、駆動車２１と従動車２２とを備えて
いる。が、従動車は駆動車の一回転にたいして1/
４回転するものからなつている。すなわち、従動
車は一本のスロツト２３のみを設けてあつて、駆
動車が一回転するときに、駆動車のピン２４がス
ロツトに係合して従動車を1/4回転させるように
している駆動車は駆動軸に、従動車はアームの回
転軸にそれぞれ取り付けてあつて、アームを第３
図に実線で示す支持板の表面から突出する位置と
鎖線で示す支持板の表面に平行な位置との間を正
確かつ確実に回転させるようにし、しかも各位置
で従動車が駆動車上のロツク円板２５に接触して
アームを止めるようにしている。点線源はこのよ
うなアームの自由端に固定されている。 Each arm has a rotating shaft 14 fixed to its end, as best shown in FIGS. 3 and 4. On the other hand, a support member 15 is fixed to the surface of the support plate. Each arm is rotatably attached to the support plate by having a rotating shaft held by a bearing 16 in the support member. Further, a drive shaft 17 is held by a bearing 18 on a support member. A Geneva mechanism 20 is disposed between these rotating shafts and the drive shaft. The Geneva mechanism is equipped with a driving wheel 21 and a driven wheel 22, similar to known devices of this type. However, the driven wheel is 1/1 per rotation of the driving wheel.
It consists of something that rotates four times. That is, the driven wheel is provided with only one slot 23, and when the driving wheel makes one rotation, the pin 24 of the driving wheel engages with the slot and causes the driven wheel to rotate 1/4 turn. The drive wheel is attached to the drive shaft, the driven wheel is attached to the rotating shaft of the arm, and the arm is attached to the third
The rotation is made accurately and reliably between the position protruding from the surface of the support plate shown by the solid line in the figure and the position parallel to the surface of the support plate shown by the chain line, and at each position the driven wheel locks on the drive wheel. The arm is stopped by contacting the disc 25. A point source is fixed to the free end of such an arm.
この装置では、さらに、従動車がアームの回転
軸に偏心して取り付けてあつて、アームが各移動
位置で強固に止められるようにしている。すなわ
ち、回転軸１４にはその中心軸にたいして偏心し
た軸部１４Ａを一体に形成してあつて、従動車２
２はこの偏心軸部にかん合されかつねじなどで固
定されている。このような偏心手段はあらかじ
め、従動車が駆動車上のロツク円板に接触してい
る状態にて、従動車を偏心軸部上で回転させかつ
固定しておくことによつて、これらの間の間隙を
最少にすることができ、それによつて従動車をよ
り強力にロツクさせることができる。 Further, in this device, the driven wheel is eccentrically attached to the rotating shaft of the arm so that the arm can be firmly stopped at each moving position. That is, the rotating shaft 14 is integrally formed with a shaft portion 14A that is eccentric with respect to its central axis.
2 is fitted onto this eccentric shaft portion and fixed with a screw or the like. Such an eccentric means is constructed by rotating and fixing the driven wheel on the eccentric shaft in advance while the driven wheel is in contact with the lock disc on the driving wheel. The gap between the wheels can be minimized, thereby allowing the driven vehicle to be more strongly locked.
駆動軸の回転は、たとえば各支持部材１５に電
動機２６を設置し、電動機の回転軸を駆動軸に連
結することによつてなすことができる。各電動機
が同時に回転されることによつて、各アームは図
面に示す回転支持の表面から突出するように位置
に回転され、また電動機が逆方向に一回転される
ことによつて、各アームは支持板の表面と平行な
位置に回転される。 The rotation of the drive shaft can be achieved, for example, by installing an electric motor 26 on each support member 15 and connecting the rotating shaft of the electric motor to the drive shaft. By rotating each motor simultaneously, each arm is rotated into a position such that it projects from the surface of the rotating support shown in the drawings, and by rotating the motor one revolution in the opposite direction, each arm is It is rotated to a position parallel to the surface of the support plate.
この較正用線源装置は、第２図に示すようにし
て、ポジトロンエミツシヨンCT装置のスキヤナ
に設置される。すなわち、支持板は、各アームが
配列されている円あるいは点線源が配列されてい
る円の中心がリングデテクタ３１の回転中心軸に
一致するようにスキヤナ内に配置されると共に、
スキヤナのフレームに回転可能に保持される。各
点線源１３はこれが配列されている円を整数で等
分した区間のひとつを占める巾を有し、リングデ
テクタの一回転ごとに前記空間と公約数をもたな
い区間の数ずつ回転される。この回転は、たとえ
ば支持板の周面に設けた歯車３２を小歯車３３に
かみ合せ、小歯車をスキヤナのフレームに設置さ
れた電動機によつてなされる。より具体的には、
点線源を前述の円の1/64の区間を占める巾に構成
し、支持板をリングデテクタの一回転ごとに7/64
回転させる。 This calibration radiation source device is installed in the scanner of the positron emission CT device as shown in FIG. That is, the support plate is arranged in the scanner so that the center of the circle in which each arm is arranged or the circle in which the point radiation sources are arranged coincides with the rotation center axis of the ring detector 31, and
Rotatably held in the scanner frame. Each point source 13 has a width that occupies one of the sections obtained by equally dividing the circle in which it is arranged by an integer, and is rotated by the number of sections that do not have a common divisor with the space for each rotation of the ring detector. . This rotation is accomplished, for example, by meshing a gear 32 provided on the peripheral surface of the support plate with a small gear 33, and using an electric motor installed in the frame of the scanner to drive the small gear. More specifically,
The point source is configured to have a width that occupies 1/64 of the aforementioned circle, and the support plate is configured to have a width that occupies 1/64 of the above-mentioned circle, and the width of the support plate is 7/64 for each rotation of the ring detector.
Rotate.
この較正用線源装置は、リングデテクタを構成
する放射線検出器の相対感度の補正や吸収補正の
ためのデータの採取に際して、アーム１２を回転
させることによつて点線源がコリメータ３４によ
り形成されるスライス面内に位置させられ、支持
板を回転させることによつて点線源をスライス面
内で被検体のまわりを回転させることができる。
支持板リングデテクタが64回転されかつ点線源が
７回転させられることによつて、各放射線検出器
が前述の補正に必要なデータを検出することがで
きる。被検体に投写され放射性同位元素にもとず
くガンマ線の検出に際しては、アームを逆転させ
ることによつて、点線源をスライス面からただち
に待避させることができる。これらの点線源の出
し入れに際して、アームがゼネバ機構を介して回
転させられているので、各点線源を正確かつ確実
に移動させることができ、しかもゼネバ機構の従
動車がアームの回転軸にたいして偏心して取り付
けてあつて、従動車とロツク円板との間隙をあら
かじめ最少に調整することができるので、点線源
の位置決めを強固かつ確実になすことができる。 In this calibration radiation source device, a point radiation source is formed by the collimator 34 by rotating the arm 12 when collecting data for correcting the relative sensitivity and correcting the absorption of the radiation detector constituting the ring detector. By rotating the support plate, which is positioned in the slice plane, the point source can be rotated around the subject in the slice plane.
The support plate ring detector is rotated 64 times and the point radiation source is rotated 7 times, so that each radiation detector can detect the data necessary for the correction described above. When detecting gamma rays projected onto the subject and based on radioactive isotopes, the point source can be immediately evacuated from the slice plane by reversing the arm. When moving these point ray sources in and out, the arm is rotated via the Geneva mechanism, so each point source can be moved accurately and reliably, and the driven wheel of the Geneva mechanism is not eccentric to the axis of rotation of the arm. When installed, the gap between the driven wheel and the lock disc can be adjusted to the minimum in advance, so that the positioning of the point ray source can be firmly and reliably determined.
本考案の較正用線源装置は、以上述べたよう
に、アームがゼネバ機構をかいして回転されてい
るので、点線源をスライス面内の位置とスライス
面から待避した位置との間を正確に回転させるこ
とができ、しかもゼネバ機構の従動車をアームの
回転中心にたいして偏心して取り付けてあるの
で、点線源を各位置で確実に停止させておくこと
ができる。 As described above, in the calibration radiation source device of the present invention, the arm is rotated using the Geneva mechanism, so the point radiation source can be accurately moved between the position within the slice plane and the position where it is evacuated from the slice plane. Moreover, since the driven wheel of the Geneva mechanism is mounted eccentrically with respect to the center of rotation of the arm, the point ray source can be reliably stopped at each position.
図面は本考案の較正用線源装置の一実施例を示
していて、第１図は正面図、第２図は側面図、第
３図は第１図−線にそう下面図、第４図は第
３図−線にそう断面図である。
１１……支持板、１２……アーム、１３……点
線源、１４……アームの回転軸、２０……ゼネバ
機構、２１……駆動車、２２……従動車。
The drawings show one embodiment of the calibration source device of the present invention, in which Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is a bottom view taken along line 1 in Fig. 1, and Fig. 4 is a cross-sectional view taken along line 3 in Fig. 3. 11: support plate, 12: arm, 13: point source, 14: arm rotation shaft, 20: Geneva mechanism, 21: driving wheel, 22: driven wheel.
Claims (1)
イス面から待避する位置との間を移動させるため
に点線源を支持する回転可能なアームと、アーム
を回転させるための駆動手段とからなり、駆動手
段がゼネバ機構を含み、ゼネバ機構が駆動車の一
回転にたいして従動車1/4回転させるものからな
ると共に、従動車をアームの回転軸に偏心して取
り付けてなること、を特徴としているポジトロン
エミツシヨンCT装置の較正用線源装置。 comprising a point radiation source, a rotatable arm supporting the point radiation source in order to move the point radiation source between a position within the slice plane and a position where it is evacuated from the slice plane, and a drive means for rotating the arm; The positron engine is characterized in that the driving means includes a Geneva mechanism, the Geneva mechanism rotates a driven wheel 1/4 of a rotation for one rotation of the driving wheel, and the driven wheel is mounted eccentrically to the rotating shaft of the arm. Radiation source device for calibration of mission CT equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9949481U JPS586289U (en) | 1981-07-06 | 1981-07-06 | Calibration source device for positron emission CT equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9949481U JPS586289U (en) | 1981-07-06 | 1981-07-06 | Calibration source device for positron emission CT equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS586289U JPS586289U (en) | 1983-01-14 |
| JPS6113982Y2 true JPS6113982Y2 (en) | 1986-04-30 |
Family
ID=29894231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9949481U Granted JPS586289U (en) | 1981-07-06 | 1981-07-06 | Calibration source device for positron emission CT equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS586289U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007271483A (en) * | 2006-03-31 | 2007-10-18 | Hitachi Ltd | Nuclear medicine diagnosis apparatus |
| JP5379580B2 (en) * | 2008-07-16 | 2013-12-25 | 三菱電機株式会社 | Dose distribution measuring device |
| JP6067959B2 (en) * | 2010-06-17 | 2017-01-25 | 東芝メディカルシステムズ株式会社 | Nuclear medicine imaging apparatus and method |
-
1981
- 1981-07-06 JP JP9949481U patent/JPS586289U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS586289U (en) | 1983-01-14 |
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