JP2020027005A - Positron ct device - Google Patents

Positron ct device Download PDF

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JP2020027005A
JP2020027005A JP2018151592A JP2018151592A JP2020027005A JP 2020027005 A JP2020027005 A JP 2020027005A JP 2018151592 A JP2018151592 A JP 2018151592A JP 2018151592 A JP2018151592 A JP 2018151592A JP 2020027005 A JP2020027005 A JP 2020027005A
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positron
radiation generating
cover member
inspection space
generating member
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JP7073979B2 (en
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橘　一成
Kazunari Tachibana
一成 橘
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Shimadzu Corp
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    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
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Abstract

To provide a positron CT device capable of safely calibrating the detection sensitivity of a photon detector while keeping the space for inspection to be large.SOLUTION: This positron CT device has a constitution in which a photon detector 11 for detecting a radiation ray is arranged in a ring shape so as to surround a space 10 for inspection. A plurality of photon detectors 11 are covered with a cover member 16. This cover member 16 has a shape along the surface of the plurality of photon detectors 11 arranged in the ring shape, and a cylindrical space 10 for inspection is formed by the cover member 16. A radiation ray generation member 12 is detachably connected to a rotation disk 21. The radiation ray generation member 12 revolves along the surface of the cover member 16 in the space 10 for inspection when the rotation disk 21 rotates.SELECTED DRAWING: Figure 1

Description

この発明は、ポジトロンＣＴ装置（Ｐｏｓｉｔｒｏｎ Ｅｍｉｓｓｉｏｎ Ｃｏｍｐｕｔｅｄ−Ｔｏｍｏｇｒａｐｈｙ：ＰＥＴ）に関する。   The present invention relates to a positron emission computed tomography (PET).

ポジトロンＣＴ装置においては、あらかじめ放射性薬剤を投与した被検者の検査領域を、リング状に配置された光子検出器内の空間に配置し、被検者の検査領域から放射される放射線としての対消滅光子を光子検出器により検出する。そして、その光子を検出した時刻を測定し、光子検出器における２個の検出領域での検出時刻差が一定時間以内の場合にそれを一対の対消滅光子として計数し、さらに、対消滅発生地点を、光子を検出した２個の検出領域の直線上の位置であると特定する。このようにして得たエミッションデータを蓄積し、蓄積したエミッションデータを用いて画像再構成を行なうことにより、ＰＥＴ画像を取得する。そして取得したＰＥＴ画像をモニターに表示するとともに、病院内のサーバ等に転送する。   In a positron CT apparatus, an examination region of a subject to which a radiopharmaceutical has been administered in advance is arranged in a space inside a photon detector arranged in a ring shape, and a pair of radiation as radiation emitted from the examination region of the subject is arranged. Annihilation photons are detected by a photon detector. Then, the time at which the photon was detected is measured, and if the difference between the detection times in the two detection regions in the photon detector is within a predetermined time, it is counted as a pair of annihilated photons. Is determined to be the position on the straight line between the two detection areas where the photons are detected. The emission data thus obtained is accumulated, and a PET image is obtained by performing image reconstruction using the accumulated emission data. Then, the acquired PET image is displayed on a monitor and transferred to a server or the like in the hospital.

このようなポジトロンＣＴ装置に使用される光子検出器の検出感度は一定ではない。このため、リング状に配置された光子検出器内の空間内において校正用の線状の放射線発生部材を旋回させ、そのときの光子検出器の出力を計測することにより、検出感度を補正するようにしている（特許文献１参照）。   The detection sensitivity of the photon detector used in such a positron CT apparatus is not constant. For this reason, the detection sensitivity is corrected by rotating the linear radiation generating member for calibration in the space inside the photon detector arranged in a ring shape and measuring the output of the photon detector at that time. (See Patent Document 1).

特許第３６０４４６９号公報Japanese Patent No. 36060469

このようなポジトロンＣＴ装置においては、従来、光子検出器の検出感度の校正時に校正用の放射線発生部が人等の障害物と衝突する危険を防止するため、光子検出器をカバー部材で覆うとともに、このカバー部材の内部、すなわち、このカバー部材により形成される円柱状の検査用空間の外側（光子検出器側）で校正用の放射線発生部を旋回させる構成が採用されている。このような構成を採用することにより、外部からアクセス可能な空間と校正用の放射線発生部の旋回量域とをカバー部材により遮断することができることから、校正用の放射線発生部が障害物と衝突することを防止することが可能となる。   Conventionally, in such a positron CT apparatus, the photon detector is covered with a cover member in order to prevent the radiation generator for calibration from colliding with an obstacle such as a person at the time of calibrating the detection sensitivity of the photon detector. A configuration is employed in which the calibration radiation generator is turned inside the cover member, that is, outside the columnar inspection space formed by the cover member (on the photon detector side). By adopting such a configuration, the space that can be accessed from the outside and the swiveling range of the radiation generator for calibration can be blocked by the cover member, so that the radiation generator for calibration collides with an obstacle. Can be prevented.

しかしながら、このような構成を採用したときには、カバー部材により形成される円柱状の検査用空間の内径が、放射線発生部材の旋回軌跡より小さくなる。このため、被検者の検査領域を配置する空間が狭くなることから、体格の大きな被検者の検査が困難となり、あるいは、被検者とカバー部材が接近して被検者に大きな圧迫感を与えるという問題が生じている。   However, when such a configuration is employed, the inner diameter of the cylindrical inspection space formed by the cover member is smaller than the turning locus of the radiation generating member. For this reason, the space for arranging the examination area of the subject is narrowed, so that it is difficult to examine the subject with a large physique, or the subject and the cover member come close to each other to cause a great feeling of oppression to the subject. The problem of giving

この発明は上記課題を解決するためになされたものであり、検査用空間を大きく維持しながら、光子検出器の検出感度の校正を安全に実行することが可能なポジトロンＣＴ装置を提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and provides a positron CT apparatus capable of safely executing the calibration of the detection sensitivity of a photon detector while maintaining a large inspection space. Aim.

請求項１に記載の発明は、リング状に配置された光子検出器を有するポジトロンＣＴ装置であって、線状の放射線発生部材と、前記光子検出器を覆い、円柱状の検査用空間を形成するカバー部材と、前記放射線発生部材を、前記検査用空間の内部において前記カバー部材の表面に沿って旋回させる旋回機構と、前記放射線発生部材と前記旋回機構とを着脱自在に接続する接続部材と、を備えたことを特徴とする。   The invention according to claim 1 is a positron CT apparatus having a ring-shaped photon detector, wherein a linear radiation generating member and a cylindrical inspection space are formed to cover the photon detector. A cover member, a turning mechanism for turning the radiation generating member along the surface of the cover member inside the inspection space, and a connecting member for detachably connecting the radiation generating member and the turning mechanism. , Is provided.

請求項２に記載の発明は、請求項１に記載の発明において、外部から前記検査用空間に至る開口部を遮蔽可能な蓋部材と、前記蓋部材が前記外部から前記検査用空間に至る開口部を遮蔽しているか否かを検出するセンサと、を備える。   According to a second aspect of the present invention, in the first aspect of the present invention, a lid member capable of shielding an opening from the outside to the inspection space, and an opening from the outside to the inspection space from the outside. A sensor for detecting whether or not the section is shielded.

請求項３に記載の発明は、請求項２に記載の発明において、前記センサが、前記蓋部材が前記外部から前記検査用空間に至る開口部を遮蔽していないと判定したときに、前記旋回機構による前記放射線発生部材の旋回動作を禁止する旋回禁止部を備える。   According to a third aspect of the present invention, in the second aspect of the present invention, when the sensor determines that the lid member does not block an opening from the outside to the inspection space, the rotation is performed. A turning prohibition unit that prohibits a turning operation of the radiation generating member by a mechanism;

請求項４に記載の発明は、請求項１に記載の発明において、前記接続部材は、前記カバー部材の表面に沿った円筒部と、前記円筒部と前記カバー部材の間において前記放射線発生部材を支持する支持部と、前記旋回機構に対して着脱自在な接続部とを有するとともに、前記接続部材が前記旋回機構と接続されているか否かを検出するセンサを備える。   According to a fourth aspect of the present invention, in the first aspect of the invention, the connection member includes a cylindrical portion along a surface of the cover member and the radiation generating member between the cylindrical portion and the cover member. It has a supporting part for supporting and a connecting part detachably attached to the turning mechanism, and a sensor for detecting whether or not the connecting member is connected to the turning mechanism.

請求項１に記載の発明によれば、光子検出器の検出感度の校正時には、円柱状の検査用空間内において放射線発生部材を旋回させるとともに、検査を行うときには放射線発生部材を旋回機構から離脱させる構成であることから、検査用の空間を大きく維持しながら、光子検出器の検出感度の校正を安全に実行することが可能となる。また、被検体を光子検出器により接近させることができることから、より高精度にエミッションデータを取得することができ、精度の高いＰＥＴ画像を取得することが可能となる。   According to the first aspect of the present invention, when the detection sensitivity of the photon detector is calibrated, the radiation generating member is turned in the cylindrical inspection space, and the radiation generating member is detached from the turning mechanism when performing the inspection. With the configuration, it is possible to safely execute the calibration of the detection sensitivity of the photon detector while maintaining a large inspection space. Further, since the subject can be brought closer to the photon detector, emission data can be acquired with higher accuracy, and a PET image with high accuracy can be acquired.

請求項２に記載の発明によれば、センサの作用により、蓋部材により外部から検査用空間に至る開口部が遮蔽され、校正作業を実行しても安全な状態であることを容易に認識することが可能となる。   According to the second aspect of the present invention, by the action of the sensor, the opening from the outside to the inspection space is blocked by the lid member, and it is easily recognized that it is safe to execute the calibration work. It becomes possible.

請求項３に記載の発明によれば、蓋部材が外部から検査用空間に至る開口部を遮蔽していないときには放射線発生部材の旋回動作が禁止されることから、校正作業を安全に実行することが可能となる。   According to the third aspect of the invention, when the lid member does not cover the opening from the outside to the inspection space, the turning operation of the radiation generating member is prohibited, so that the calibration operation can be performed safely. Becomes possible.

請求項４に記載の発明によれば、センサの作用により、放射線発生部材を支持する接続部材が旋回機構と接続され、校正作業を実行し得る状態であることを容易に認識することが可能となる。   According to the fourth aspect of the present invention, it is possible to easily recognize that the connection member supporting the radiation generating member is connected to the turning mechanism by the action of the sensor, and is in a state where the calibration work can be performed. Become.

この発明に係るポジトロンＣＴ装置の概要図である。1 is a schematic diagram of a positron CT apparatus according to the present invention. この発明に係るポジトロンＣＴ装置に使用される放射線発生部材１２の斜視図である。FIG. 2 is a perspective view of a radiation generating member 12 used in the positron CT apparatus according to the present invention. この発明に係るポジトロンＣＴ装置の主要な制御系を示すブロック図である。FIG. 2 is a block diagram showing a main control system of the positron CT apparatus according to the present invention. この発明の第２実施形態のポジトロンＣＴ装置の概要図である。It is a schematic diagram of a positron CT apparatus of a second embodiment of the present invention. この発明の第２実施形態に係るポジトロンＣＴ装置に使用される接続部材４０および放射線発生部材１９の斜視図である。It is a perspective view of the connection member 40 and the radiation generating member 19 used for the positron CT apparatus according to the second embodiment of the present invention. この発明の第２実施形態に係るポジトロンＣＴ装置の主要な制御系を示すブロック図である。FIG. 6 is a block diagram illustrating a main control system of a positron CT apparatus according to a second embodiment of the present invention.

以下、この発明の実施の形態を図面に基づいて説明する。図１は、この発明に係るポジトロンＣＴ装置の概要図である。また、図２は、この発明に係るポジトロンＣＴ装置に使用される放射線発生部材１２の斜視図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a positron CT apparatus according to the present invention. FIG. 2 is a perspective view of the radiation generating member 12 used in the positron CT apparatus according to the present invention.

このポジトロンＣＴ装置は、例えば、あらかじめ放射性薬剤を投与した被検者の頭部を円柱状の形状を有する検査用空間１０内に配置し、被検者の頭部から放射される対消滅光子を検出することによりＰＥＴ画像を取得するものである。   In this positron CT apparatus, for example, a head of a subject to which a radiopharmaceutical has been administered in advance is arranged in an examination space 10 having a cylindrical shape, and a pair of annihilation photons emitted from the head of the subject is generated. A PET image is acquired by detecting the image.

このポジトロンＣＴ装置は、放射線を検出する光子検出器１１を検査用空間１０を取り囲むようにリング状に配置した構成を有する。リング状に配置された光子検出器１１は、図１に示す実施形態においては３列配置されており、検査用空間１０は、リング状に配置された複数の光子検出器１１により取り囲まれている。複数の光子検出器１１は、カバー部材１６により覆われている。このカバー部材１６は、リング状に配置された複数の光子検出器１１の表面に沿う形状を有し、このカバー部材１６により円柱状の検査用空間１０が形成される。   This positron CT apparatus has a configuration in which photon detectors 11 for detecting radiation are arranged in a ring shape so as to surround an inspection space 10. The photon detectors 11 arranged in a ring shape are arranged in three rows in the embodiment shown in FIG. 1, and the inspection space 10 is surrounded by a plurality of photon detectors 11 arranged in a ring shape. . The plurality of photon detectors 11 are covered by a cover member 16. The cover member 16 has a shape along the surface of the plurality of photon detectors 11 arranged in a ring shape, and the cover member 16 forms a cylindrical inspection space 10.

外部から円柱状の検査用空間１０に至る開口部１７の前面には、この開口部１７を遮蔽可能な蓋部材２６が配設されている。この蓋部材２６は、コネクタ２７を介して装置本体と着脱自在に連結されている。このコネクタ２７には、蓋部材２６が外部から検査用空間１０に至る開口部１７を遮蔽しているか否かを検出するための接続センサ２９（後述する図３参照）が配設されている。   On the front surface of the opening 17 extending from the outside to the cylindrical inspection space 10, a lid member 26 capable of shielding the opening 17 is provided. This lid member 26 is detachably connected to the apparatus main body via a connector 27. The connector 27 is provided with a connection sensor 29 (see FIG. 3 described later) for detecting whether or not the lid member 26 covers the opening 17 that extends from the outside to the inspection space 10.

検査用空間１０における開口部１７とは逆側には、図示しない支持部材により回転可能に支持された回転円盤２１が配設されている。この回転円盤２１は、モータ２５の駆動により回転する同期プーリ２４と、同期ベルト２３を介して連結されている。このため、回転円盤２１は、モータ２５の駆動により回転する。この回転円盤２１の回転中心は、検査用空間１０の中心と一致している。そして、回転円盤２１には、放射線発生部材１２との連結部２２が配設されている。   A rotating disk 21 rotatably supported by a support member (not shown) is disposed on the side opposite to the opening 17 in the inspection space 10. The rotating disk 21 is connected via a synchronous belt 23 to a synchronous pulley 24 rotated by the drive of a motor 25. Therefore, the rotating disk 21 is rotated by driving the motor 25. The center of rotation of the rotating disk 21 coincides with the center of the inspection space 10. The rotating disk 21 is provided with a connecting portion 22 for connecting to the radiation generating member 12.

図２に示すように、放射線発生部材１２は、内部にポジトロンを放出する放射線源が充填された線状の棒状部１３と、ハンドル１５とを備える。棒状部１３のハンドル１５とは逆側の端部は、ネジ加工がされた雄ネジ部１４となっている。この雄ネジ部１４は、回転円盤２１に配設された連結部２２に穿設された雌ネジ部（図示せず）と螺合可能となっている。放射線発生部材１２を連結部２２に固定するときには、ハンドル１５を操作して放射線発生部材１２を棒状部１３の軸心を中心として回転させる。このため、放射線発生部材１２は、雄ネジ部１４と連結部２２の作用により、回転円盤２１に対して着脱自在に接続される。そして、この放射線発生部材１２は、回転円盤２１が矢印Ａで示すように回転すると、矢印Ｂに示すように、検査用空間１０の内部においてカバー部材１６の表面に沿って旋回する。この雄ネジ部１４と連結部２２とは、この発明における接続部材を構成する。   As shown in FIG. 2, the radiation generating member 12 includes a linear rod-shaped portion 13 filled with a radiation source that emits a positron, and a handle 15. The end of the bar 13 opposite to the handle 15 is a male screw 14 which has been threaded. The male screw portion 14 can be screwed with a female screw portion (not shown) formed in a connecting portion 22 provided on the rotating disk 21. When fixing the radiation generating member 12 to the connecting portion 22, the handle 15 is operated to rotate the radiation generating member 12 about the axis of the rod portion 13. For this reason, the radiation generating member 12 is detachably connected to the rotating disk 21 by the action of the male screw part 14 and the connecting part 22. Then, when the rotating disk 21 rotates as shown by the arrow A, the radiation generating member 12 turns along the surface of the cover member 16 inside the inspection space 10 as shown by the arrow B. The male screw part 14 and the connecting part 22 constitute a connecting member in the present invention.

図３は、この発明に係るポジトロンＣＴ装置の主要な制御系を示すブロック図である。   FIG. 3 is a block diagram showing a main control system of the positron CT apparatus according to the present invention.

このポジトロンＣＴ装置は、装置全体を制御する制御部３０を備える。この制御部３０は、ソフトウエアがインストールされたコンピュータから構成される。この制御部３０に含まれる各部の機能は、コンピュータにインストールされているソフトウエアを実行することで実現される。   This positron CT apparatus includes a control unit 30 that controls the entire apparatus. The control unit 30 includes a computer in which software is installed. The function of each unit included in the control unit 30 is realized by executing software installed in the computer.

この制御部３０は、モータ２５を駆動することにより回転円盤２１および放射線発生部材１２の回転を制御する旋回制御部３１と、コネクタ２７における接続センサ２９と接続され、蓋部材２６が外部から検査用空間１０に至る開口部１７を遮蔽していないと判定したとき放射線発生部材１２の旋回動作を禁止する旋回禁止部３２と、蓋部材２６が外部から検査用空間１０に至る開口部１７を遮蔽することなく放射線発生部材１２の旋回開始操作を行ったときに警告を表示する警告表示部３３と、を備える。   The control unit 30 is connected to a rotation control unit 31 that controls the rotation of the rotating disk 21 and the radiation generating member 12 by driving a motor 25, and a connection sensor 29 in a connector 27. When it is determined that the opening 17 that reaches the space 10 is not blocked, the turning prohibition unit 32 that prohibits the turning operation of the radiation generating member 12 and the lid member 26 block the opening 17 that reaches the inspection space 10 from the outside. And a warning display unit 33 that displays a warning when a rotation start operation of the radiation generating member 12 is performed without performing the operation.

以上のような構成を有するポジトロンＣＴ装置において、ＰＥＴ画像を取得するためにＣＴ撮影を実行するときには、放射線発生部材１２は、回転円盤２１から取り外される。また、蓋部材２６も、外部から円柱状の検査用空間１０に至る開口部１７の前面から取り外される。   In the positron CT apparatus configured as described above, when performing CT imaging to acquire a PET image, the radiation generating member 12 is removed from the rotating disk 21. Further, the lid member 26 is also removed from the front surface of the opening 17 extending from the outside to the cylindrical inspection space 10.

一方、以上のような構成を有するポジトロンＣＴ装置において、光子検出器１１の検出感度の校正を行うときには、放射線発生部材１２におけるハンドル１５を保持し、棒状部１３の先端に形成された雄ネジ部１４を連結部２２に穿設された雌ネジ部に螺合させることにより、放射線発生部材１２を回転円盤２１に固定する。また、蓋部材２６をコネクタ２７と連結させ、外部から円柱状の検査用空間１０に至る開口部１７を蓋部材２６により遮蔽する。そして、モータ２５の駆動により回転円盤２１を回転させ、これにより放射線発生部材１２を検査用空間１０の内部においてカバー部材１６の表面に沿って旋回させる。   On the other hand, in the positron CT apparatus having the above-described configuration, when the detection sensitivity of the photon detector 11 is calibrated, the handle 15 of the radiation generating member 12 is held, and the male screw formed at the tip of the rod 13 is formed. The radiation generating member 12 is fixed to the rotating disk 21 by screwing the 14 into a female screw portion formed in the connecting portion 22. Further, the lid member 26 is connected to the connector 27, and the opening 17 extending from the outside to the cylindrical inspection space 10 is shielded by the lid member 26. Then, the rotating disk 21 is rotated by the drive of the motor 25, whereby the radiation generating member 12 is turned inside the inspection space 10 along the surface of the cover member 16.

この時には、外部から円柱状の検査用空間１０に至る開口部１７が蓋部材２６により遮蔽されていることから、人等の障害物と旋回する放射線発生部材１２とが衝突する危険を防止することが可能となる。また、外部から円柱状の検査用空間１０に至る開口部１７が蓋部材２６により遮蔽されていない状態において放射線発生部材１２の旋回動作を開始しようとしても、旋回禁止部３２の作用によりモータ２５の駆動が禁止される。また、警告表示部３３により図示しない表示部等に警告表示がなされるとともに、必要に応じ、警告音が発生される。   At this time, since the opening 17 from the outside to the cylindrical inspection space 10 is shielded by the lid member 26, it is possible to prevent a danger of collision between the swirling radiation generating member 12 and an obstacle such as a person. Becomes possible. Further, even if the turning operation of the radiation generating member 12 is to be started in a state where the opening 17 extending from the outside to the cylindrical inspection space 10 is not covered by the lid member 26, the operation of the motor 25 is prevented by the operation of the turning prohibiting portion 32. Driving is prohibited. In addition, the warning display unit 33 displays a warning on a display unit (not shown) or the like, and generates a warning sound as necessary.

なお、上述した実施形態においては、円柱状の検査用空間１０の一端に形成された開口部１７に対して蓋部材２６を配置しているが、検査用空間１０の両側に開口部が存在するときには、両方に蓋部材２６を配設すればよい。   In the above-described embodiment, the lid member 26 is arranged with respect to the opening 17 formed at one end of the cylindrical inspection space 10, but there are openings on both sides of the inspection space 10. In some cases, the lid members 26 may be provided on both sides.

次に、この発明の他の実施形態について説明する。図４は、この発明の第２実施形態に係るポジトロンＣＴ装置の概要図である。また、図５は、この発明の第２実施形態に係るポジトロンＣＴ装置に使用される接続部材４０および放射線発生部材１９の斜視図である。さらに、図６は、この発明の第２実施形態に係るポジトロンＣＴ装置の主要な制御系を示すブロック図である。なお、図１および図３に示す実施形態と同様の部材については、同一の符号を付して詳細な説明を省略する。   Next, another embodiment of the present invention will be described. FIG. 4 is a schematic diagram of a positron CT apparatus according to the second embodiment of the present invention. FIG. 5 is a perspective view of the connecting member 40 and the radiation generating member 19 used in the positron CT apparatus according to the second embodiment of the present invention. FIG. 6 is a block diagram showing a main control system of the positron CT apparatus according to the second embodiment of the present invention. The same members as those in the embodiment shown in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description is omitted.

この第２実施形態においては、回転機構を構成する回転円盤２１に対して着脱自在な接続部材４０が、カバー部材１６の表面に沿った円筒部４１と、回転円盤２１に対して着脱自在な接続部４２と、フランジ部４３と、両端を接続部４２とフランジ部４３とに支持された筒状部材から構成され、フランジ部４３に形成された孔部４５から挿入された放射線発生部材１９を円筒部４１とカバー部材１６との間において支持する支持部４４と、を有している。   In the second embodiment, a connection member 40 detachable from the rotating disk 21 constituting the rotation mechanism is connected to a cylindrical portion 41 along the surface of the cover member 16 and a connection detachable from the rotating disk 21. Part, a flange part 43, and a cylindrical member supported at both ends by the connection part 42 and the flange part 43, and the radiation generating member 19 inserted through the hole part 45 formed in the flange part 43 is cylindrical. And a support portion 44 for supporting between the portion 41 and the cover member 16.

また、装置本体の側面には、投光部４７ａと受光部４７ｂとを有し、接続部材４０における回転円盤２１に装着された接続部４２を検知することにより、接続部材４０が回転円盤２１と接続されているか否かを検出するセンサ４７が配設されている。   Further, on the side surface of the apparatus main body, there are a light projecting part 47a and a light receiving part 47b, and by detecting the connecting part 42 attached to the rotating disk 21 in the connecting member 40, the connecting member 40 is A sensor 47 for detecting whether or not the connection is provided is provided.

この第２実施形態に係るポジトロンＣＴ装置において、ＰＥＴ画像を取得するためにＣＴ撮影を実行するときには、放射線発生部材１９を支持する接続部材４０は、回転円盤２１から取り外される。   In the positron CT apparatus according to the second embodiment, when performing CT imaging to acquire a PET image, the connecting member 40 supporting the radiation generating member 19 is removed from the rotating disk 21.

一方、この第２実施形態に係るポジトロンＣＴ装置において、光子検出器１１の検出感度の校正を行うときには、接続部材４０を回転円盤２１に固定する。そして、モータ２５の駆動により回転円盤２１を回転させ、これにより放射線発生部材１９を接続部材４０とともに、検査用空間１０の内部においてカバー部材１６の表面に沿って旋回させる。   On the other hand, in the positron CT apparatus according to the second embodiment, when calibrating the detection sensitivity of the photon detector 11, the connecting member 40 is fixed to the rotating disk 21. Then, the rotating disk 21 is rotated by the drive of the motor 25, whereby the radiation generating member 19 is swung together with the connecting member 40 along the surface of the cover member 16 inside the inspection space 10.

この時には、放射線発生部材１９は、接続部材４０における円筒部４１とカバー部材１６との間の領域で旋回することから、人等の障害物と旋回する放射線発生部材１９とが衝突する危険を防止することが可能となる。また、接続部材４０と回転円盤２１とが接続されていない状態において放射線発生部材１９の旋回動作を開始しようとしても、旋回禁止部３２の作用によりモータ２５の駆動が禁止される。また、警告表示部３３により図示しない表示部等に警告表示がなされるとともに、必要に応じ、警告音が発生される。   At this time, since the radiation generating member 19 rotates in the region between the cylindrical portion 41 and the cover member 16 in the connection member 40, it is possible to prevent a danger of collision between the rotating radiation generating member 19 and an obstacle such as a person. It is possible to do. Further, even if the turning operation of the radiation generating member 19 is to be started in a state where the connecting member 40 and the rotating disk 21 are not connected, the driving of the motor 25 is prohibited by the operation of the turning prohibiting portion 32. In addition, the warning display unit 33 displays a warning on a display unit (not shown) or the like, and generates a warning sound as necessary.

１０ 検査用空間
１１ 光子検出器
１２ 放射線発生部材
１３ 棒状部
１４ 雄ネジ部
１５ ハンドル
１６ カバー部材
１７ 開口部
１９ 放射線発生部材
２１ 回転円盤
２２ 連結部
２３ 同期ベルト
２４ 同期プーリ
２５ モータ
２６ 蓋部材
２７ コネクタ
２９ 接続センサ
３０ 制御部
３１ 旋回制御部
３２ 旋回禁止部
３３ 警告表示部
４０ 接続部材
４１ 円筒部
４２ 接続部
４３ フランジ部
４４ 支持部
４７ センサ
DESCRIPTION OF SYMBOLS 10 Inspection space 11 Photon detector 12 Radiation generating member 13 Rod part 14 Male screw part 15 Handle 16 Cover member 17 Opening 19 Radiation generating member 21 Rotating disk 22 Connection part 23 Synchronous belt 24 Synchronous pulley 25 Motor 26 Cover member 27 Connector 29 connection sensor 30 control unit 31 turning control unit 32 turning prohibition unit 33 warning display unit 40 connecting member 41 cylindrical unit 42 connecting unit 43 flange unit 44 support unit 47 sensor

Claims (4)

リング状に配置された光子検出器を有するポジトロンＣＴ装置であって、
線状の放射線発生部材と、
前記光子検出器を覆い、円柱状の検査用空間を形成するカバー部材と、
前記放射線発生部材を、前記検査用空間の内部において前記カバー部材の表面に沿って旋回させる旋回機構と、
前記放射線発生部材と前記旋回機構とを着脱自在に接続する接続部材と、
を備えたことを特徴とするポジトロンＣＴ装置。 A positron CT apparatus having a ring-shaped photon detector,
A linear radiation generating member,
A cover member that covers the photon detector and forms a cylindrical inspection space,
A turning mechanism for turning the radiation generating member along the surface of the cover member inside the inspection space,
A connection member for detachably connecting the radiation generating member and the turning mechanism,
A positron CT apparatus comprising: 請求項１に記載のポジトロンＣＴ装置において、
外部から前記検査用空間に至る開口部を遮蔽可能な蓋部材と、
前記蓋部材が前記外部から前記検査用空間に至る開口部を遮蔽しているか否かを検出するセンサと、
を備えるポジトロンＣＴ装置。 The positron CT apparatus according to claim 1,
A cover member capable of shielding an opening from the outside to the inspection space,
A sensor for detecting whether or not the lid member blocks an opening from the outside to the inspection space,
A positron CT apparatus comprising: 請求項２に記載のポジトロンＣＴ装置において、
前記センサが、前記蓋部材が前記外部から前記検査用空間に至る開口部を遮蔽していないと判定したときに、前記旋回機構による前記放射線発生部材の旋回動作を禁止する旋回禁止部を備えるポジトロンＣＴ装置。 The positron CT apparatus according to claim 2,
A positron having a swirling prohibition unit for prohibiting a swiveling operation of the radiation generating member by the swirling mechanism when the sensor determines that the lid member does not block an opening from the outside to the inspection space; CT device. 請求項１に記載のポジトロンＣＴ装置において、
前記接続部材は、前記カバー部材の表面に沿った円筒部と、前記円筒部と前記カバー部材の間において前記放射線発生部材を支持する支持部と、前記旋回機構に対して着脱自在な接続部とを有するとともに、
前記接続部材が前記旋回機構と接続されているか否かを検出するセンサを備えるポジトロンＣＴ装置。 The positron CT apparatus according to claim 1,
The connection member, a cylindrical portion along the surface of the cover member, a support portion that supports the radiation generating member between the cylindrical portion and the cover member, and a connection portion that is detachable from the turning mechanism. With
A positron CT apparatus including a sensor for detecting whether or not the connection member is connected to the turning mechanism.
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