CN110811657B - Positron CT device - Google Patents
Positron CT device Download PDFInfo
- Publication number
- CN110811657B CN110811657B CN201910671574.4A CN201910671574A CN110811657B CN 110811657 B CN110811657 B CN 110811657B CN 201910671574 A CN201910671574 A CN 201910671574A CN 110811657 B CN110811657 B CN 110811657B
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- Prior art keywords
- radiation generating
- cover member
- positron
- generating member
- turning
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- 230000005855 radiation Effects 0.000 claims abstract description 60
- 238000007689 inspection Methods 0.000 claims abstract description 38
- 238000002600 positron emission tomography Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 12
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000013170 computed tomography imaging Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229940121896 radiopharmaceutical Drugs 0.000 description 2
- 239000012217 radiopharmaceutical Substances 0.000 description 2
- 230000002799 radiopharmaceutical effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000037237 body shape Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Optics & Photonics (AREA)
- Biomedical Technology (AREA)
- Biophysics (AREA)
- High Energy & Nuclear Physics (AREA)
- Theoretical Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pulmonology (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Nuclear Medicine (AREA)
Abstract
The invention provides a positron CT device capable of maintaining a large examination space and safely correcting the detection sensitivity of a photon detector. The positron CT apparatus has a structure in which photon detectors (11) for detecting radiation are annularly arranged so as to surround an examination space (10). 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 an annular shape, and a cylindrical inspection space (10) is formed by the cover member (16). The radiation generating member (12) is detachably connected to the rotary disk (21). When the rotary disk (21) rotates, the radiation generating member (12) rotates along the surface of the cover member (16) in the inspection space (10).
Description
Technical Field
The present invention relates to a positron CT apparatus (Positron Emission Computed-tomograph: PET).
Background
In a positron CT apparatus, an examination region of a subject to which a radiopharmaceutical has been administered in advance is disposed in a space within photon detectors disposed in a ring shape, and a pair of annihilation photons, which are radiation emitted from the examination region of the subject, are detected by the photon detectors. When the detection time difference between the two detection regions of the photon detector is within a predetermined time, the photon is counted as a pair of annihilation photons, and the annihilation occurrence point is specified as a position on a straight line of the two detection regions where the photon is detected. The radiation data thus obtained is stored, and a PET image is acquired by performing image reconstruction using the stored radiation data. The acquired PET image is then displayed on a display, and transmitted to a server or the like in the hospital.
The photon detector used in such a positron CT apparatus has a non-constant detection sensitivity. Therefore, the detection sensitivity is corrected by rotating the linear radiation generating member for correction in the space within the photon detector arranged in a ring shape and measuring the output of the photon detector at that time (see patent document 1).
Prior art literature
Patent literature
Patent document 1: japanese patent No. 3604469
Disclosure of Invention
Problems to be solved by the invention
In such a positron CT apparatus, conventionally, in order to prevent the risk of collision of a radiation generating unit for correction with an obstacle such as a person when correcting the detection sensitivity of a photon detector, the following structure has been adopted: the photon detector is covered with a cover member, and the radiation generating section for correction is rotated inside the cover member, that is, outside (the photon detector side) of a cylindrical inspection space formed by the cover member. By adopting such a configuration, the space that can be accessed from the outside can be blocked by the cover member from the turning region of the correction radiation generating portion, and therefore the correction radiation generating portion can be prevented from colliding with the obstacle.
However, when such a configuration is adopted, the inner diameter of the cylindrical inspection space formed by the cover member is smaller than the rotation locus of the radiation generating member. Therefore, the space for disposing the examination region of the subject is narrow, and thus the following problems arise: the inspection of a subject having a large body shape becomes difficult, or the subject comes close to the cover member to give a large feeling of compression to the subject.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a positron CT apparatus capable of maintaining a large examination space and safely performing correction of the detection sensitivity of a photon detector.
Solution for solving the problem
The invention described in claim 1 is a positron CT apparatus having photon detectors arranged in a ring shape, comprising: a radiation generating member having a linear shape; 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; and a connecting member for detachably connecting the radiation generating member and the swing mechanism.
The invention described in claim 2 is the positron CT apparatus according to the invention described in claim 1, comprising: a cover member capable of shielding an opening portion extending from the outside to the inspection space; and a sensor for detecting whether or not the cover member shields an opening portion extending from the outside to the inspection space.
The invention described in claim 3 is the positron CT apparatus according to claim 2, wherein the positron emission tomography apparatus includes a rotation prohibiting unit that prohibits a rotation operation of the radiation generating member by the rotation mechanism when the sensor determines that the cover member does not cover the opening portion extending from the outside to the inspection space.
The invention described in claim 4 is the invention described in claim 1, wherein the connecting member includes: a cylindrical portion along a 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 unit that is detachable from the slewing mechanism, wherein the positron CT apparatus includes a sensor for detecting whether the connection member is connected to the slewing mechanism.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the invention described in claim 1, the following structure is adopted: when correcting the detection sensitivity of the photon detector, the radiation generating member is rotated in the columnar space for inspection, and the radiation generating member is disengaged from the rotation mechanism at the time of inspection, so that the space for inspection can be maintained large, and the correction of the detection sensitivity of the photon detector can be safely performed. Further, since the subject can be brought closer to the photon detector, radiation data can be acquired with higher accuracy, and a PET image with higher accuracy can be acquired.
According to the invention described in claim 2, the following conditions can be easily recognized by the action of the sensor: the opening extending from the outside to the inspection space is shielded by the cover member, and is in a safe state even if the correction work is performed.
According to the invention described in claim 3, since the turning operation of the radiation generating member is inhibited when the cover member does not cover the opening portion extending from the outside to the inspection space, the correction operation can be safely performed.
According to the invention described in claim 4, the following can be easily recognized by the action of the sensor: the connection member for supporting the radiation generating member is connected to the slewing mechanism, and is in a state in which the correction operation can be performed.
Drawings
Fig. 1 is a schematic diagram of a positron CT apparatus of the present invention.
Fig. 2 is a perspective view of the radiation generating member 12 used in the positron CT apparatus of the present invention.
Fig. 3 is a block diagram showing a main control system of the positron CT apparatus of the present invention.
Fig. 4 is a schematic diagram of a positron CT apparatus according to embodiment 2 of the present invention.
Fig. 5 is a perspective view of a connecting member 40 and a radiation generating member 19 used in the positron CT apparatus according to embodiment 2 of the present invention.
Fig. 6 is a block diagram showing a main control system of the positron CT apparatus according to embodiment 2 of the present invention.
Description of the reference numerals
10. An inspection space; 11. a photon detector; 12. a radiation generating member; 13. a rod-shaped portion; 14. an external thread portion; 15. a handle; 16. a cover member; 17. an opening portion; 19. a radiation generating member; 21. a rotating disc; 22. a connecting part; 23. a synchronous belt; 24. a synchronous pulley; 25. a motor; 26. a cover member; 27. a connector; 29. connecting a sensor; 30. a control unit; 31. a rotation control unit; 32. a rotation prohibiting section; 33. a warning display unit; 40. a connecting member; 41. a cylindrical portion; 42. a connection part; 43. a flange portion; 44. a support section; 47. a sensor.
Detailed Description
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 of the present invention. Fig. 2 is a perspective view of the radiation generating member 12 used in the positron CT apparatus of the present invention.
The positron CT apparatus, for example, disposes a head of a subject into which a radiopharmaceutical has been previously introduced in an examination space 10 having a cylindrical shape, detects a pair of annihilation photons emitted from the head of the subject, and acquires a PET image.
The positron CT apparatus has a structure in which photon detectors 11 for detecting radiation are annularly arranged so as to surround an examination space 10. In the embodiment shown in fig. 1, the photon detectors 11 arranged in a ring form are arranged in 3 rows, and the inspection space 10 is surrounded by a plurality of photon detectors 11 arranged in a ring form. 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 a cylindrical inspection space 10 is formed by the cover member 16.
A cover member 26 capable of shielding the opening 17 is disposed in front of the opening 17 extending from the outside to the columnar inspection space 10. The cover member 26 is detachably coupled to the apparatus main body via a connector 27. A connection sensor 29 (see fig. 3 described later) for detecting whether or not the cover member 26 covers the opening 17 extending from the outside to the inspection space 10 is disposed in the connector 27.
A rotatable disk 21 rotatably supported by a support member not shown is disposed on the side of the inspection space 10 opposite to the opening 17. The rotary disk 21 is coupled to a timing pulley 24 rotated by driving a motor 25 via a timing belt 23. Accordingly, the rotary disk 21 is rotated by the driving of the motor 25. The rotation center of the rotary disk 21 coincides with the center of the inspection space 10. The rotary disk 21 is provided with a coupling portion 22 to be coupled to the radiation generating member 12.
As shown in fig. 2, the radiation generating member 12 includes a linear rod-shaped portion 13 filled with a radiation source for emitting positrons therein, and a handle 15. The end of the rod-shaped portion 13 opposite to the handle 15 is a male screw portion 14 that is screw-processed. The male screw portion 14 can be screwed with a female screw portion (not shown) provided in a coupling portion 22 provided in the rotary disk 21. When the radiation generating member 12 is to be fixed to the connecting portion 22, the handle 15 is operated to rotate the radiation generating member 12 about the axial center of the rod-shaped portion 13. Therefore, the radiation generating member 12 is detachably connected to the rotary disk 21 by the male screw portion 14 and the connecting portion 22. When the rotary disk 21 rotates as indicated by arrow a, the radiation generating member 12 rotates along the surface of the cover member 16 inside the space 10 for inspection as indicated by arrow B. The male screw portion 14 and the coupling portion 22 constitute a connecting member of the present invention.
Fig. 3 is a block diagram showing a main control system of the positron CT apparatus of the present invention.
The positron CT apparatus includes a control unit 30 for controlling the entire apparatus. The control unit 30 is constituted by a computer having software installed therein. The functions of the respective units included in the control unit 30 are realized by executing software installed in a computer.
The control unit 30 includes: a rotation control unit 31 for controlling rotation of the rotary disk 21 and the radiation generating member 12 by driving the motor 25; a turning prohibiting unit 32 connected to the connection sensor 29 of the connector 27, for prohibiting the turning operation of the radiation generating member 12 when it is determined that the opening 17 extending from the outside to the inspection space 10 is not shielded by the cover member 26; and a warning display unit 33 that displays a warning when the radiation generating member 12 is turned on without shielding the opening 17 extending from the outside to the inspection space 10 by the cover member 26.
In the case of the positron CT apparatus having the above-described configuration, the radiation generating member 12 is detached from the rotary disk 21 when CT imaging is performed to acquire a PET image. The cover member 26 is also removed from the front surface of the opening 17 extending from the outside to the columnar inspection space 10.
On the other hand, in the case of the positron CT apparatus having the above-described configuration, when the detection sensitivity of the photon detector 11 is corrected, the handle 15 of the radiation generating member 12 is held, and the male screw portion 14 formed at the tip of the rod-like portion 13 is screwed with the female screw portion penetrating the coupling portion 22, so that the radiation generating member 12 is fixed to the rotary disk 21. The cover member 26 is connected to the connector 27, and the opening 17 extending from the outside to the columnar inspection space 10 is shielded by the cover member 26. Then, the rotary disk 21 is rotated by the driving of the motor 25, whereby the radiation generating member 12 is rotated along the surface of the cover member 16 inside the space 10 for inspection.
At this time, since the opening 17 extending from the outside to the columnar space for inspection 10 is shielded by the cover member 26, it is possible to prevent the risk of collision of an obstacle such as a person with the revolving radiation generating member 12. In addition, in a state where the opening 17 extending from the outside to the columnar inspection space 10 is not shielded by the cover member 26, even if the turning operation of the radiation generating member 12 is to be started, the driving of the motor 25 is inhibited by the turning inhibiting portion 32. The warning display unit 33 displays a warning on a display unit, not shown, or the like, and generates a warning sound as needed.
In the above-described embodiment, the cover member 26 is disposed in the opening 17 formed at one end of the columnar inspection space 10, but when the opening is present on both sides of the inspection space 10, the cover member 26 may be disposed on both sides.
Next, another embodiment of the present invention will be described. Fig. 4 is a schematic diagram of a positron CT apparatus according to embodiment 2 of the present invention. Fig. 5 is a perspective view of a connecting member 40 and a radiation generating member 19 used in the positron CT apparatus according to embodiment 2 of the present invention. Fig. 6 is a block diagram showing a main control system of the positron CT apparatus according to embodiment 2 of the present invention. The same reference numerals are given to the same members as those of the embodiment shown in fig. 1 and 3, and detailed description thereof is omitted.
In embodiment 2, the connecting member 40, which is detachable from the rotary disk 21 constituting the rotary mechanism, includes: a cylindrical portion 41 along the surface of the cover member 16; a connection part 42 which is detachable from the rotary disk 21; a flange portion 43; and a support portion 44 that is formed of a tubular member having both ends supported by the connection portion 42 and the flange portion 43, and that supports the radiation generating member 19 inserted from the hole portion 45 formed in the flange portion 43 between the tubular portion 41 and the cover member 16.
A sensor 47 is disposed on the side surface of the device body, and the sensor 47 has a light projecting portion 47a and a light receiving portion 47b, and detects whether or not the connection member 40 is connected to the rotary disk 21 by detecting the connection portion 42 of the connection member 40 attached to the rotary disk 21.
In the positron CT apparatus of embodiment 2, when CT imaging is performed to acquire a PET image, the connecting member 40 supporting the radiation generating member 19 is detached from the rotary disk 21.
On the other hand, in the case of the positron CT apparatus of embodiment 2, the connecting member 40 is fixed to the rotary disk 21 at the time of correcting the detection sensitivity of the photon detector 11. Then, the rotary disk 21 is rotated by the driving of the motor 25, whereby the radiation generating member 19 is rotated along the surface of the cover member 16 inside the space 10 for inspection together with the connecting member 40.
At this time, the radiation generating member 19 rotates in the region between the cylindrical portion 41 of the connecting member 40 and the cover member 16, and therefore, the risk of collision of an obstacle such as a person with the rotating radiation generating member 19 can be prevented. In addition, in a state where the connection member 40 and the rotary disk 21 are not connected, even if the turning operation of the radiation generating member 19 is to be started, the driving of the motor 25 is inhibited by the turning inhibiting portion 32. The warning display unit 33 displays a warning on a display unit, not shown, or the like, and generates a warning sound as needed.
Claims (3)
1. A positron CT apparatus having photon detectors arranged in a ring shape, characterized in that,
the positron CT apparatus includes:
a radiation generating member having a linear shape;
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 connecting member for detachably connecting the radiation generating member and the turning mechanism;
a cover member capable of shielding an opening portion extending from the outside to the inspection space; and
and a sensor for detecting whether the cover member shields the opening.
2. The positron emission tomography apparatus as claimed in claim 1, wherein,
the positron CT apparatus further includes a swing prohibiting unit that prohibits a swing operation of the radiation generating member by the swing mechanism when the sensor detects that the cover member does not cover the opening.
3. A positron CT apparatus having photon detectors arranged in a ring shape, characterized in that,
the positron CT apparatus includes:
a radiation generating member having a linear shape;
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 connecting member for detachably connecting the radiation generating member and the turning mechanism;
a sensor for detecting whether the connection member is connected with the swing mechanism; and
a turning prohibition unit that prohibits turning operation of the radiation generating member by the turning mechanism when the sensor detects that the connecting member is not connected to the turning mechanism,
the connecting member has: a cylindrical portion along a 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 part which is detachable from the swing mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018151592A JP7073979B2 (en) | 2018-08-10 | 2018-08-10 | Positron CT device |
| JP2018-151592 | 2018-08-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110811657A CN110811657A (en) | 2020-02-21 |
| CN110811657B true CN110811657B (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910671574.4A Active CN110811657B (en) | 2018-08-10 | 2019-07-24 | Positron CT device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7073979B2 (en) |
| CN (1) | CN110811657B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490675A (en) * | 1981-06-13 | 1984-12-25 | Bruker Analytische Messtechnik Gmbh | Electromagnet for use in NMR tomography |
| JPH02262086A (en) * | 1989-03-31 | 1990-10-24 | Shimadzu Corp | Sensitivity correction apparatus of ring ect apparatus |
| JPH0487490U (en) * | 1990-11-30 | 1992-07-29 | ||
| JPH05240958A (en) * | 1992-02-29 | 1993-09-21 | Shimadzu Corp | Positron ct apparatus |
| JPH07318653A (en) * | 1994-05-26 | 1995-12-08 | Hitachi Medical Corp | Positron ct system |
| JPH08292267A (en) * | 1995-04-20 | 1996-11-05 | Hitachi Medical Corp | Positron ct equipment |
| JPH0990042A (en) * | 1995-09-28 | 1997-04-04 | Hamamatsu Photonics Kk | Positron ct device and its picture reconstructing method |
| JP2000028727A (en) * | 1999-07-06 | 2000-01-28 | Hamamatsu Photonics Kk | Positron ct apparatus |
| JP2007086089A (en) * | 2006-12-28 | 2007-04-05 | Shimadzu Corp | Positron ct device |
| WO2007116816A1 (en) * | 2006-03-31 | 2007-10-18 | Hitachi, Ltd. | Nuclear medicine diagnosis apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9128193B2 (en) * | 2012-10-16 | 2015-09-08 | Kabushiki Kaisha Toshiba | Two-axis apparatus with stationary positioning, rotating and/or scanning motion of point or line sources |
| US20150065869A1 (en) * | 2013-09-03 | 2015-03-05 | Prescient Imaging LLC | Low noise transmission scan simultaneous with positron emission tomography |
-
2018
- 2018-08-10 JP JP2018151592A patent/JP7073979B2/en active Active
-
2019
- 2019-07-24 CN CN201910671574.4A patent/CN110811657B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490675A (en) * | 1981-06-13 | 1984-12-25 | Bruker Analytische Messtechnik Gmbh | Electromagnet for use in NMR tomography |
| JPH02262086A (en) * | 1989-03-31 | 1990-10-24 | Shimadzu Corp | Sensitivity correction apparatus of ring ect apparatus |
| JPH0487490U (en) * | 1990-11-30 | 1992-07-29 | ||
| JPH05240958A (en) * | 1992-02-29 | 1993-09-21 | Shimadzu Corp | Positron ct apparatus |
| JPH07318653A (en) * | 1994-05-26 | 1995-12-08 | Hitachi Medical Corp | Positron ct system |
| JPH08292267A (en) * | 1995-04-20 | 1996-11-05 | Hitachi Medical Corp | Positron ct equipment |
| JPH0990042A (en) * | 1995-09-28 | 1997-04-04 | Hamamatsu Photonics Kk | Positron ct device and its picture reconstructing method |
| JP2000028727A (en) * | 1999-07-06 | 2000-01-28 | Hamamatsu Photonics Kk | Positron ct apparatus |
| WO2007116816A1 (en) * | 2006-03-31 | 2007-10-18 | Hitachi, Ltd. | Nuclear medicine diagnosis apparatus |
| JP2007086089A (en) * | 2006-12-28 | 2007-04-05 | Shimadzu Corp | Positron ct device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7073979B2 (en) | 2022-05-24 |
| JP2020027005A (en) | 2020-02-20 |
| CN110811657A (en) | 2020-02-21 |
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