CN110811657A - Positron CT device - Google Patents
Positron CT device Download PDFInfo
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- CN110811657A CN110811657A CN201910671574.4A CN201910671574A CN110811657A CN 110811657 A CN110811657 A CN 110811657A CN 201910671574 A CN201910671574 A CN 201910671574A CN 110811657 A CN110811657 A CN 110811657A
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- positron
- cover member
- radiation generating
- inspection space
- generating member
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- 230000005855 radiation Effects 0.000 claims abstract description 56
- 238000007689 inspection Methods 0.000 claims abstract description 37
- 230000002401 inhibitory effect Effects 0.000 claims description 6
- 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 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000013170 computed tomography imaging Methods 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
- 230000000694 effects Effects 0.000 description 1
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- 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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- Engineering & Computer Science (AREA)
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- 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)
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- 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 which can maintain a large inspection space and can safely correct the detection sensitivity of a photon detector. The positron CT device has a structure in which a photon detector (11) for detecting radiation is annularly arranged so as to surround an examination space (10). The plurality of photon detectors (11) are covered with 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). The radiation generating member (12) is detachably connected to the rotating disk (21). When the rotating disk (21) rotates, the radiation generating member (12) revolves along the surface of the cover member (16) in the inspection space (10).
Description
Technical Field
The present invention relates to a Positron CT device (PET).
Background
In a positron CT apparatus, an examination region of a subject into which a radiopharmaceutical has been previously administered is disposed in a space within a ring-shaped photon detector, and annihilation photons in pairs, which are radiation emitted from the examination region of the subject, are detected by the photon detector. Then, the time at which the photon is detected is measured, and when the difference between the detection times at 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 pair annihilation occurrence point is specified as the position on the straight line of the two detection regions at which 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. Then, the acquired PET image is displayed on a display and transmitted to a server or the like in a hospital.
The detection sensitivity of the photon detector used in such a positron CT apparatus is not constant. Therefore, the linear radiation generating member for correction is rotated in the space in the annularly arranged photon detector, and the output of the photon detector at that time is measured, thereby correcting the detection sensitivity (see patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3604469
Disclosure of Invention
Problems to be solved by the invention
In the case of such a positron CT apparatus, conventionally, in order to prevent a 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 configuration is adopted: the photon detector is covered with a cover member, and the radiation generating unit for calibration is rotated inside the cover member, that is, outside (on the photon detector side) the cylindrical inspection space formed by the cover member. With this configuration, the space that can be accessed from the outside and the turning region of the radiation generating unit for correction can be blocked by the cover member, and therefore the radiation generating unit for correction can be prevented from colliding with an obstacle.
However, in the case of such a configuration, 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 arranging the examination region of the subject is narrow, and therefore the following problems occur: the examination of a large-sized subject becomes difficult, or the subject comes close to the cover member to give a large feeling of pressure 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 detection sensitivity of a photon detector.
Means for solving the problems
The invention described in claim 1 is a positron CT apparatus having a photon detector arranged in a ring shape, the positron CT apparatus including: a radiation generating member in a linear shape; a cover member that covers the photon detector and forms a cylindrical inspection space; a revolving mechanism for revolving the radiation generating member along a surface of the cover member inside the inspection space; and a connecting member that detachably connects the radiation generating member and the rotating mechanism.
The invention described in claim 2 is the invention described in claim 1, wherein the positron CT apparatus includes: a cover member capable of shielding an opening extending from the outside to the inspection space; and a sensor for detecting whether or not the cover member covers an opening extending from the outside to the inspection space.
The invention described in claim 3 is the positron CT apparatus described in claim 2, wherein the positron CT 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 shield an opening 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 rotation mechanism, and the positron CT apparatus includes a sensor for detecting whether or not the connection member is connected to the rotation mechanism.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the invention described in claim 1, the structure is as follows: when the detection sensitivity of the photon detector is corrected, the radiation generating member is rotated in the cylindrical inspection space, and the radiation generating member is separated from the rotating mechanism when the inspection is performed, so that the inspection space can be maintained large, and the correction of the detection sensitivity of the photon detector can be safely performed. In addition, since the subject can be brought closer to the photon detector, the 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 situation can be easily recognized by the action of the sensor: an opening extending from the outside to the inspection space is shielded by the cover member, and the opening is in a safe state even if the calibration work is performed.
According to the invention described in claim 3, since the turning operation of the radiation generating member is prohibited when the opening extending from the outside to the inspection space is not shielded by the cover member, the calibration work can be performed safely.
According to the invention described in claim 4, the following situation can be easily recognized by the action of the sensor: the connecting member for supporting the radiation generating member is connected to the swing mechanism, and is in a state capable of performing the calibration operation.
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 the connecting member 40 and the 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 a 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 threaded portion; 15. a handle; 16. a cover member; 17. an opening part; 19. a radiation generating member; 21. rotating the disc; 22. a connecting portion; 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 inhibiting unit; 33. a warning display unit; 40. a connecting member; 41. a cylindrical portion; 42. a connecting portion; 43. a flange portion; 44. a support portion; 47. a sensor.
Detailed Description
Embodiments of the present invention will be described below 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.
In this positron CT apparatus, for example, the head of a subject into which a radiopharmaceutical has been previously injected is disposed in an examination space 10 having a cylindrical shape, and a pair of annihilation photons emitted from the head of the subject are detected to acquire a PET image.
This positron CT apparatus has a configuration in which a photon detector 11 for detecting radiation is annularly arranged so as to surround an examination space 10. The ring-shaped photon detectors 11 are arranged in 3 rows in the embodiment shown in fig. 1, and the inspection space 10 is surrounded by the ring-shaped photon detectors 11. 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 the columnar inspection space 10.
A cover member 26 capable of covering the opening 17 is disposed on the front surface of the opening 17 extending from the outside to the columnar inspection space 10. The cover member 26 is detachably connected to the apparatus main body via a connector 27. A connection sensor 29 (see fig. 3 described later) for detecting whether or not the opening 17 extending from the outside to the inspection space 10 is blocked by the cover member 26 is disposed in the connector 27.
A rotating 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 rotating disc 21 is connected to a timing pulley 24 that is rotated by driving of a motor 25 via a timing belt 23. Therefore, the rotary disk 21 is rotated by the driving of the motor 25. The rotation center of the rotating disk 21 coincides with the center of the inspection space 10. A coupling portion 22 coupled to the radiation generating member 12 is disposed on the rotating disk 21.
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 and a handle 15. The end of the rod-shaped portion 13 opposite to the handle 15 is a male screw portion 14 formed by screwing. The male screw portion 14 is threadably engaged with a female screw portion (not shown) provided in a coupling portion 22 disposed on the rotating disc 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 rotating disk 21 by the external thread portion 14 and the connecting portion 22. When the rotating disk 21 rotates as indicated by arrow a, the radiation generating member 12 rotates along the surface of the cover member 16 in the inspection space 10 as indicated by arrow B. The male screw portion 14 and the coupling portion 22 constitute a coupling 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 with 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 section 31 that controls rotation of the rotating disk 21 and the radiation generating member 12 by driving the motor 25; a rotation inhibiting unit 32 connected to the connection sensor 29 of the connector 27 and inhibiting the rotation operation of the radiation generating member 12 when it is determined that the cover member 26 does not shield the opening 17 extending from the outside to the inspection space 10; and a warning display unit 33 that displays a warning when the rotation start operation of the radiation generating member 12 is performed on the premise that the opening 17 extending from the outside to the inspection space 10 is not shielded by the cover member 26.
In the case of the positron CT apparatus having the above-described configuration, the radiation generating means 12 is detached from the rotating 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 radiation generating member 12 is fixed to the rotating disk 21 by holding the handle 15 of the radiation generating member 12 and screwing the male screw portion 14 formed at the distal end of the rod-shaped portion 13 to the female screw portion inserted in the coupling portion 22. 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 rotating disk 21 is rotated by driving of the motor 25, whereby the radiation generating member 12 is rotated along the surface of the cover member 16 in the inspection space 10.
At this time, since the opening 17 extending from the outside to the columnar inspection space 10 is shielded by the cover member 26, it is possible to prevent a risk of collision between an obstacle such as a person and the rotating radiation generating member 12. 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 when the rotation operation of the radiation generating member 12 is to be started, the rotation inhibiting portion 32 inhibits the driving of the motor 25. The warning display unit 33 displays a warning on a display unit, not shown, 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 the connecting member 40 and the 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 a positron CT apparatus according to embodiment 2 of the present invention. In addition, the same members as those of the embodiment shown in fig. 1 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
In embodiment 2, the connecting member 40 that 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 connecting portion 42 which is detachable from the rotary disk 21; a flange portion 43; and a support portion 44 which is composed of a cylindrical member having both ends supported by the connection portion 42 and the flange portion 43, and supports the radiation generating member 19 inserted from a hole 45 formed in the flange portion 43 between the cylindrical portion 41 and the cover member 16.
A sensor 47 is disposed on a side surface of the apparatus main body, and the sensor 47 has a light projecting portion 47a and a light receiving portion 47b and detects whether or not the linking member 40 is linked to the rotary disk 21 by detecting the linking portion 42 of the linking member 40 attached to the rotary disk 21.
In the positron CT apparatus according to embodiment 2, the connecting member 40 supporting the radiation generating unit 19 is detached from the rotating disk 21 when CT imaging is performed to acquire a PET image.
On the other hand, in the case of the positron CT apparatus according to embodiment 2, the connection member 40 is fixed to the rotary disk 21 when the detection sensitivity of the photon detector 11 is corrected. Then, the rotating disk 21 is rotated by driving of the motor 25, whereby the radiation generating member 19 is rotated along the surface of the cover member 16 inside the inspection space 10 together with the connecting member 40.
At this time, the radiation generating member 19 revolves in the region between the cylindrical portion 41 of the connecting member 40 and the cover member 16, and therefore, it is possible to prevent a risk of collision of an obstacle such as a person with the revolving radiation generating member 19. In a state where the coupling member 40 and the rotating disk 21 are not coupled to each other, even when the rotation operation of the radiation generating member 19 is to be started, the rotation inhibiting unit 32 inhibits the driving of the motor 25. The warning display unit 33 displays a warning on a display unit, not shown, and generates a warning sound as needed.
Claims (4)
1. A positron CT apparatus having a photon detector arranged in a ring shape, the positron CT apparatus being characterized in that,
the positron CT apparatus includes:
a radiation generating member in a linear shape;
a cover member that covers the photon detector and forms a cylindrical inspection space;
a revolving mechanism for revolving the radiation generating member along a surface of the cover member inside the inspection space; and
and a connecting member that detachably connects the radiation generating member and the rotating mechanism.
2. The positron CT apparatus according to claim 1,
the positron CT apparatus includes:
a cover member capable of shielding an opening extending from the outside to the inspection space; and
a sensor for detecting whether or not the cover member blocks an opening extending from the outside to the inspection space.
3. The positron CT apparatus of claim 2, wherein,
the positron CT apparatus includes a rotation inhibiting unit that inhibits 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 extending from the outside to the examination space.
4. The positron CT apparatus according to claim 1,
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 connecting part which is detachable relative to the rotating mechanism and is provided with a connecting part,
the positron CT device comprises a sensor for detecting whether the connecting component is connected with the slewing mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-151592 | 2018-08-10 | ||
| JP2018151592A JP7073979B2 (en) | 2018-08-10 | 2018-08-10 | Positron CT device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110811657A true CN110811657A (en) | 2020-02-21 |
| CN110811657B CN110811657B (en) | 2023-09-29 |
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| 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 (11)
| 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 |
| US20150065869A1 (en) * | 2013-09-03 | 2015-03-05 | Prescient Imaging LLC | Low noise transmission scan simultaneous with positron emission tomography |
Family Cites Families (1)
| 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 |
-
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 (11)
| 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 |
| US20150065869A1 (en) * | 2013-09-03 | 2015-03-05 | Prescient Imaging LLC | Low noise transmission scan simultaneous with positron emission tomography |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7073979B2 (en) | 2022-05-24 |
| CN110811657B (en) | 2023-09-29 |
| JP2020027005A (en) | 2020-02-20 |
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