Patent US4823017A successfully refreshed from Google Patents.
US4823017A
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US
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Scintillation camera and multifocal fan-beam collimator used therein
Assignee: Siemens Medical Solutions USA Inc
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Filing: 1986-12-19
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Granted: 1989-04-18
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Expires: 2006-12-19
Abstract
Abstract A fan-beam collimator has a plurality of focal lengths. The shortest focal length is located at the center of the collimator. The longest focal length is located at the periphery of the collimator. The focal length increases between the minimum focal length and the maximum focal length.
Inventors
- 👤 Jiang Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:51
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1642; G21; G21K; G21K1/00; G21K1/02; G21K1/025; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/037
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
18 words
A scintillation camera system, comprising a scintillation camera head and fan-beam collimator having a plurality of focal lengths.
Claim 2
Dependent Claim
18 words
A scintillation camera system, comprising a scintillation camera head and fan-beam collimator having a plurality of focal lengths.
Claim 3
Dependent Claim
22 words
A scintilation camera system, comprising a scintillation camera head and a fan-beam collimator which focuses to a plurality of coplanar focal points.
Claim 4
Dependent Claim
22 words
A scintilation camera system, comprising a scintillation camera head and a fan-beam collimator which focuses to a plurality of coplanar focal points.
Claim 5
Dependent Claim
20 words
The scintillation camera system of claim 2, wherein the focal points are all coplanar with a centerline of the collimator.
Claim 6
Dependent Claim
65 words
A fan-beam collimator having a plurality of focal lengths, the focal length of the collimator being at a minimum value adjacent a centerline of the collimator, the focal length of the collimator being at a maximum value adjacent two opposed peripheral regions thereof and the focal length of the collimator nondecreasing from said minimum value to said maximum value as distance from said centerline increases.
Claim 7
Dependent Claim
65 words
A fan-beam collimator having a plurality of focal lengths, the focal length of the collimator being at a minimum value adjacent a centerline of the collimator, the focal length of the collimator being at a maximum value adjacent two opposed peripheral regions thereof and the focal length of the collimator nondecreasing from said minimum value to said maximum value as distance from said centerline increases.
Claim 8
Dependent Claim
16 words
The collimator of claim 4, wherein the focal length of the collimator varies in discrete steps.
Claim 9
Dependent Claim
21 words
The collimator of claim 4, wherein said minimum value is approximately 45 cm and said maximum value is approximately 130 cm.
Claim 10
Dependent Claim
23 words
The collimator of claim 4, wherein the focal length of the collimator varies in such small discrete steps as to simulate continuous variation.
References Cited (Backward Citations)
FR1561351A
Cited
US3688113A
Cited
US3777148A
Cited
DE2351450A1
Cited
US4250392A
Cited
US4670657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |