Patent US4774410A successfully refreshed from Google Patents.
US4774410A
Expired / Lapsed
US
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Asymmetric S.P.E.C.T. collimator which surrounds the patient
Assignee: Siemens Medical Solutions USA Inc
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Filing: 1987-09-02
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Granted: 1988-09-27
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Expires: 2007-09-02
Abstract
Abstract First, second, third and fourth sections of a collimator are arranged to bound an asymmetric interior region. The collimator has one and only one focal point, which is located inside the body to be imaged. The first and second sections are curved and are preferably circular arcs with different radii of curvature. The third and fourth sections are straight.
Inventors
- 👤 Jiang Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:27
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1648; G01T1/1644; G21; G21K; G21K1/00; G21K1/02; G21K1/025; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/037
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A collimator for use in SPECT imaging, comprising: first, second, third and fourth sections arranged in a manner that the first and second sections are curved and opposed to each other and focus to a single focal point; the third and fourth sections are straight and opposed to each other and focus to said single focal point; and the third and fourth sections are connected to and extend between the first and second sections to form a closed curve which bounds an interior region in which said point is located.
Claim 2
Dependent Claim
90 words
A collimator for use in SPECT imaging, comprising: first, second, third and fourth sections arranged in a manner that the first and second sections are curved and opposed to each other and focus to a single focal point; the third and fourth sections are straight and opposed to each other and focus to said single focal point; and the third and fourth sections are connected to and extend between the first and second sections to form a closed curve which bounds an interior region in which said point is located.
Claim 3
Dependent Claim
14 words
The collimator of claim 1, wherein the first and second sections are differently shaped.
Claim 4
Dependent Claim
22 words
The collimator of claim 2, wherein the first and second collimator sections are arcs of circles which have different radii of curvature.
Claim 5
Dependent Claim
16 words
The collimator of claim 2, wherein a one of the first and second sections is semicircular.
Claim 6
Dependent Claim
36 words
A collimator having the shape of a noncircular closed curve, the collimator bounding an interior region and, within each image plane of interest, focusing to one and only one focal point located in said interior region.
Claim 7
Dependent Claim
36 words
A collimator having the shape of a noncircular closed curve, the collimator bounding an interior region and, within each image plane of interest, focusing to one and only one focal point located in said interior region.
References Cited (Backward Citations)
US4095107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |