EP0412734A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Single photon emission CT apparatus
Assignee: Toshiba Corp
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Filing: 1990-08-03
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Granted: —
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Expires: 2010-08-03
Abstract
Abstract A single-photon emission computed tomography (SPECT) apparatus for detecting gamma rays emitted from a radioisotope given to a body to be examined, including three focus collimators (9) and corresponding detectors (10) arranged at 120 o intervals and each capable of rotating 120 o around the body for providing detection data; a processor for processing said detection data to produce a reconstruction data corresponding to a densdity distribution tomographic image of the radioisotope in the body; and holding mechanisms for positioning a compensation radioisotope (19) adjacent the focus point of each focus collimator on a structure (61) which rotates together with each focus collimator and corresponding detector upon rotation of each focus collimator and corresponding detector around the body.
Inventors
- 👤 Takashi C/O Intellectual Property Div. Ichihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:40
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2985; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/037
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A single-photon emission computed tomography (SPECT) apparatus for detecting gamma rays emitted from a radioisotope given to a target body to be examined comprising: at least one focus collimator (9-1) and a corresponding detector (10-1) mounted on a structure (6) capable of rotation around at least a portion of said body for providing detection data; means (15-18) for processing said detection data to produce reconstruction data corresponding to a density distribution tomographic image of said radioisotope in said body; and characterised in the provision of holding means (11-1) for positioning a compensation radioisotope (12-1), adjacent the focus point (13-1) of said focus collimator for rotation with the structure (6).
Claim 2
Dependent Claim
109 words
A single-photon emission computed tomography (SPECT) apparatus for detecting gamma rays emitted from a radioisotope given to a target body to be examined comprising: at least one focus collimator (9-1) and a corresponding detector (10-1) mounted on a structure (6) capable of rotation around at least a portion of said body for providing detection data; means (15-18) for processing said detection data to produce reconstruction data corresponding to a density distribution tomographic image of said radioisotope in said body; and characterised in the provision of holding means (11-1) for positioning a compensation radioisotope (12-1), adjacent the focus point (13-1) of said focus collimator for rotation with the structure (6).
Claim 3
Dependent Claim
113 words
A single-photon emission computed tomography (SPECT) apparatus for detecting gamma rays emitted from a radioisotope given to a target body to be examined comprising: three focus collimators (9-1, 9-2, 9-3) and corresponding detectors (10-1, 10-2, 10-3) arranged at 120 o intervals on a structure (6) capable of rotation through 120 o around the body for providing detection data; means (15-18) for processing said detection data to produce reconstruction data corresponding to a density distribution tomographic image of the radioisotope in said body; and characterised in the provision of holding means (11-1) for positioning a compensation radioisotope (12-1) adjacent the focus point (13-1) of each focus collimator (9-1) for rotation with the structure (6).
Claim 4
Dependent Claim
113 words
A single-photon emission computed tomography (SPECT) apparatus for detecting gamma rays emitted from a radioisotope given to a target body to be examined comprising: three focus collimators (9-1, 9-2, 9-3) and corresponding detectors (10-1, 10-2, 10-3) arranged at 120 o intervals on a structure (6) capable of rotation through 120 o around the body for providing detection data; means (15-18) for processing said detection data to produce reconstruction data corresponding to a density distribution tomographic image of the radioisotope in said body; and characterised in the provision of holding means (11-1) for positioning a compensation radioisotope (12-1) adjacent the focus point (13-1) of each focus collimator (9-1) for rotation with the structure (6).
Claim 5
Dependent Claim
46 words
The SPECT apparatus according to claim 1 or 2, characterised in the provision of means (20, 27) for selectively exposing and shielding the or each compensation radioisotope to permit exposure and shielding of said compensation radioisotope on the side of said focus collimator and said detector.
Claim 6
Dependent Claim
22 words
The SPECT apparatus according to claim 2, characterised in that the holding means for each compensation radioisotope is provided by two detectors.
Claim 7
Dependent Claim
40 words
The SPECT apparatus as claimed in claim 4, characterised in that each compensation radioisotape is in a plate-like container (12-1) which is removably located with a pair of opposite sides in slide grooves (14) formed in two adjacent detectors (10).
Claim 8
Dependent Claim
42 words
The SPECT apparatus as claimed in claim 2, characterised in that the means for exposing and shielding the or each compensation radioisotope (19) comprise a pair of shutters (21) displaceable inwardly and outwardly of slots (22) in a pair of detectors (10).
Claim 9
Dependent Claim
30 words
The SPECT apparatus as claimed in claim 6, characterised in that the shutters (21) are provided with drive mechanisms (23) for displacing them into and out of the slots (22).
Claim 10
Dependent Claim
41 words
The SPECT apparatus as claimed in claim 3, characterised in that the or each compensation radioisotope (28) is mounted such as to be displaceable between an operating position and an ambush position in which it is shielded from the dectector (10).
References Cited (Backward Citations)
No citation records indexed.
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