Patent US6618709B1 successfully refreshed from Google Patents.
Patent EP0090594A1 successfully refreshed from Google Patents.
EP0090594A1
Expired / Lapsed
EP
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Scintillation camera
Assignee: Shimadzu Corp
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Filing: 1983-03-23
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Granted: —
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Expires: 2003-03-23
Abstract
Abstract A scintillation camera dispensing with a position calculation circuit which is indispensable to the Anger scintillation camera. The number of incident gamma rays is integrated only in the lengthwise direction of the shielding plates of a rotatable parallel plate collimator. Data on one-dimensional distribution, which are collected every time the collimator has rotated by the specified angle, are subjected to image information processing so that a picture of distribution of gamma rays may be obtained. In the presently proposed improvements in the Anger scintillation camera, a coordinate transformation circuit is added thereto, in which outputs taken from a position calculation circuit in the form of data on two-dimensional distribution are transformed into data on one-dimensional distribution and fed to an arithmetic unit for the reconstruction of an image. A collimator, which is effective for the collection of data on one-dimensional distribution, is also proposed.
Inventors
- 👤 Hiroyuki Hattori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:45
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1644; G01T1/1642; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/037; A61B6/42; A61B6/4208; A61B6/4258
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A scintillation camera comprising: a radiation detector provided with scintillators; a parallel plate collimator rotatably disposed on the front side of said radiation detector and consisting of a first set of shielding plates arranged in parallel with each other with regular spaces left between adjacent plates and a second set of shielding plates disposed at both ends or shielding plates of equal space and in the middle portion of said first set of shielding plates so as to intersect them; a means by which the number of incident gamma rays is integrated in the lengthwise direction of said first set of shielding plates and, every time said collimator has rotated by a very small angle, data on the distribution of these integrated counting rates are collected in the direction perpendicular to the longitudinal edges of said first set of shielding plates; and an arithmetic unit for the reconstruction of an image.
Claim 2
Dependent Claim
151 words
A scintillation camera comprising: a radiation detector provided with scintillators; a parallel plate collimator rotatably disposed on the front side of said radiation detector and consisting of a first set of shielding plates arranged in parallel with each other with regular spaces left between adjacent plates and a second set of shielding plates disposed at both ends or shielding plates of equal space and in the middle portion of said first set of shielding plates so as to intersect them; a means by which the number of incident gamma rays is integrated in the lengthwise direction of said first set of shielding plates and, every time said collimator has rotated by a very small angle, data on the distribution of these integrated counting rates are collected in the direction perpendicular to the longitudinal edges of said first set of shielding plates; and an arithmetic unit for the reconstruction of an image.
Claim 3
Dependent Claim
24 words
The scintillation camera as set forth in claim 1, wherein said radiation detector, together with said parallel plate collimator, is adapted to be revolved.
Claim 4
Dependent Claim
44 words
The scintillation camera as set forth in claim 1, wherein said second set of shielding plates are disposed in such a manner that their lower edges ab-ut against the upper edges of said first set of shielding plates so as to form solid crossings.
Claim 5
Dependent Claim
161 words
A scintillation camera comprising: a radiation detector provided with scintillators; a parallel plate collimator rotatably disposed on the front side of said radiation detector and consisting of a first set of shielding plates arranged in parallel with each other with regular spaces left between adjacent plates and a second set of shielding plates disposed at both sends or shielding plates of equal space and in the middle portion of said first set of shielding plates so as to interesect them; a position calculation circuit to which inputs corresponding to the scintillations of light are applied and the positions of scintillations are calculated from these inputs so that position signals may be developed; - a coordinate transformation circuit in which, every time said collimator has rotated by the specified angle, outputs taken from said position calculation circuit in the form of data on two-dimensional distribution are transformed into data on one-dimensional distribution; and an arithmetic unit for the reconstruction of an image.
Claim 6
Dependent Claim
161 words
A scintillation camera comprising: a radiation detector provided with scintillators; a parallel plate collimator rotatably disposed on the front side of said radiation detector and consisting of a first set of shielding plates arranged in parallel with each other with regular spaces left between adjacent plates and a second set of shielding plates disposed at both sends or shielding plates of equal space and in the middle portion of said first set of shielding plates so as to interesect them; a position calculation circuit to which inputs corresponding to the scintillations of light are applied and the positions of scintillations are calculated from these inputs so that position signals may be developed; - a coordinate transformation circuit in which, every time said collimator has rotated by the specified angle, outputs taken from said position calculation circuit in the form of data on two-dimensional distribution are transformed into data on one-dimensional distribution; and an arithmetic unit for the reconstruction of an image.
Claim 7
Dependent Claim
24 words
The scintillation camera as set forth in claim 4, wherein said radiation detector, together with said parallel plate collimator, is adapted to be revolved.
Claim 8
Dependent Claim
44 words
The scintillation camera as set forth in claim 4, wherein said second set of shielding plates are disposed in such a manner that their lower edges ab-ut against the upper edges of said first set of shielding plates so as to form solid crossings.
Claim 9
Dependent Claim
68 words
A collimator for use in a scintillation camera or ECT, comprising: a plurality of equally spaced parallel plates having a pronounced property of absorbing gamma rays; and a corrugated spacer inserted into each space between adjacent ones of said parallel plates; said spacer being adapted to have any degree of capacity to absorb gamma rays, provided that said spacer is inferior to said parallel plates in such capacity.
Claim 10
Dependent Claim
68 words
A collimator for use in a scintillation camera or ECT, comprising: a plurality of equally spaced parallel plates having a pronounced property of absorbing gamma rays; and a corrugated spacer inserted into each space between adjacent ones of said parallel plates; said spacer being adapted to have any degree of capacity to absorb gamma rays, provided that said spacer is inferior to said parallel plates in such capacity.
References Cited (Backward Citations)
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