US4227088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed computer assisted tomography
Assignee: AT&T Inc
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Filing: 1978-10-10
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Granted: 1980-10-07
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Expires: 1998-10-10
Abstract
Abstract X-ray generation and detection apparatus for use in a computer assisted tomography system which permits relatively high speed scanning. A large X-ray tube having a circular anode (3) surrounds the patient area. A movable electron gun (8) orbits adjacent to the anode. The anode directs into the patient area X-rays which are delimited into a fan beam by a pair of collimating rings (21). After passing through the patient, X-rays are detected by an array (22) of movable detectors. Detector subarrays (23) are synchronously movable out of the X-ray plane to permit the passage of the fan beam.
Inventors
- 👤 Dan Maydan
- 👤 Lawrence A. Shepp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:09
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/56; A61B6/02; A61B6/03; A61B6/032; A61B6/40; A61B6/4021; A61B6/4028; A61B6/42; A61B6/4275; H; H01; H01J; H01J35/00; H01J35/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
Apparatus for X-ray generation and detection for use in a transverse section computer assisted tomography system comprising a fixed circular anode (3) surrounding a patient area, a source (8) of electrons impinging upon said anode thereby producing X-rays directed through the patient area, and a circular array of detectors (22) characterized in that said source of electrons is a single electron producing structure incorporated on a rotatable ring adjacent to said fixed circular anode, said ring surrounds the patient area and is substantially concentric with the longitudinal axis of the patient area; said single electron producing structure being orbitally movable by said ring around the patient area adjacent to said fixed circular anode, and said detectors lie in the X-ray beam plane and are partitioned into groups, each group being movable out of said plane synchronously with the movement of said single electron producing structure.
Claim 2
Dependent Claim
145 words
Apparatus for X-ray generation and detection for use in a transverse section computer assisted tomography system comprising a fixed circular anode (3) surrounding a patient area, a source (8) of electrons impinging upon said anode thereby producing X-rays directed through the patient area, and a circular array of detectors (22) characterized in that said source of electrons is a single electron producing structure incorporated on a rotatable ring adjacent to said fixed circular anode, said ring surrounds the patient area and is substantially concentric with the longitudinal axis of the patient area; said single electron producing structure being orbitally movable by said ring around the patient area adjacent to said fixed circular anode, and said detectors lie in the X-ray beam plane and are partitioned into groups, each group being movable out of said plane synchronously with the movement of said single electron producing structure.
Claim 3
Dependent Claim
28 words
Apparatus as set forth in claim 1 further comprising means (17) for detecting the orbital position of said electron producing structure and means (24,25) for moving said detectors.
Claim 4
Dependent Claim
18 words
Apparatus as set forth in claim 1 wherein said detectors are movable axially with relation to said anode.
Claim 5
Dependent Claim
19 words
Apparatus as set forth in claims 1, 2, or 3 wherein said electron producing structure includes an electron gun.
Claim 6
Dependent Claim
21 words
Apparatus as set forth in claims 1, 2, or 3 wherein said electron producing structure includes a hot filament electron emitter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |