Patent US3238610A successfully refreshed from Google Patents.
Patent US4541107A successfully refreshed from Google Patents.
US4541107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving X-ray mask with spiral window
Assignee: GRADY JOHN K LITTLETON
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Filing: 1984-06-04
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Granted: 1985-09-10
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Expires: 2004-06-04
Abstract
Abstract An X-ray system includes an X-ray source directing X-radiation on a first path through a subject to an X-radiation receptor which responds to X-rays to direct light radiation on a secondary path to a light image plane. In either path or both paths is a rotating radiation-opaque mask having one or more spiral radio-transparent windows which sweep through the path as the mask rotates. Each spiral window may be formed by the overlap of coaxial spiral windows in superimposed masks which are relatively adjustable in phase to vary the window width.
Inventors
- 👤 Remo J. Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:29
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025; A; A61; A61B; A61B6/00; A61B6/06; G21K1/10; A61B6/02; A61B6/027
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
An X-ray system for radiological examination of a subject comprising: an X-ray source directing radiation on a first path through a subject position; an X-radiation receptor on the path beyond the subject responsive to received X-rays to direct light radiation on a secondary path to a light image plane; and a rotating radiation-opaque mask in one of said paths including a spiral radio-transparent window sweeping through the path as the mask rotates.
Claim 2
Dependent Claim
72 words
An X-ray system for radiological examination of a subject comprising: an X-ray source directing radiation on a first path through a subject position; an X-radiation receptor on the path beyond the subject responsive to received X-rays to direct light radiation on a secondary path to a light image plane; and a rotating radiation-opaque mask in one of said paths including a spiral radio-transparent window sweeping through the path as the mask rotates.
Claim 3
Dependent Claim
12 words
A system according to claim 1 wherein the mask is X-ray opaque.
Claim 4
Dependent Claim
12 words
A system according to claim 1 wherein the mask is light opaque.
Claim 5
Dependent Claim
16 words
A system according to claim 1 wherein the window is of uniform width along its spiral.
Claim 6
Dependent Claim
22 words
A system according to claim 1 wherein the window is of uniform width radially of the axis of rotation of the mask.
Claim 7
Dependent Claim
16 words
A system according to claim 1 wherein the spiral window has a plurality of 360° turns.
Claim 8
Dependent Claim
17 words
A system according to claim 1 wherein the mask has a plurality of spaced, coaxial, spiral windows.
Claim 9
Dependent Claim
12 words
A system according to claim 7 wherein the windows are uniformly spaced.
Claim 10
Dependent Claim
12 words
A system according to claim 7 wherein the windows are spirally equal.
Claim 11
Dependent Claim
13 words
A system according to claim 7 wherein the windows are equal in width.
Claim 12
Dependent Claim
16 words
A system according to claim 10 wherein the windows are spaced apart at least their width.
Claim 13
Dependent Claim
34 words
A system according to claim 1 wherein the mask comprises two closely superimposed, coaxial radio-opaque disks, respective disks having coaxial spiral, radio-transparent windows, disposed to overlap one another to define a smaller effective window.
Claim 14
Dependent Claim
24 words
A system according to claim 12 in combination with drive means for rotating the disks to sweep the effective windows through the X-ray path.
Claim 15
Dependent Claim
20 words
A combination according to claim 13 wherein the drive means includes phasing means for adjusting the overlap of the windows.
Claim 16
Dependent Claim
34 words
A combination according to claim 13 wherein the drive means is separately coupled to respective disks and includes means to adjust the phase relation of the disks and hence the overlap of their windows.
Claim 17
Dependent Claim
27 words
A combination according to claim 13 wherein the drive means comprises two motors respectively driving the disks and a control of the relative phase of the motors.
Claim 18
Dependent Claim
57 words
In an X-ray system directing X-radiation on a path through a subject position to an X-ray receptor emitting secondary, light radiation a scatter reducing device comprising: two closely superimposed, coaxial radio-opaque disks, respective disks having coaxial spiral, radio transparent windows, disposed to overlap one another to define a smaller effective window; and means rotatively supporting the disks.
Claim 19
Dependent Claim
57 words
In an X-ray system directing X-radiation on a path through a subject position to an X-ray receptor emitting secondary, light radiation a scatter reducing device comprising: two closely superimposed, coaxial radio-opaque disks, respective disks having coaxial spiral, radio transparent windows, disposed to overlap one another to define a smaller effective window; and means rotatively supporting the disks.
Claim 20
Dependent Claim
17 words
A device according to claim 17 including means for adjusting the degree of overlap of the windows.
Claim 21
Dependent Claim
12 words
A device according to claim 17 wherein the disks are X-ray opaque.
References Cited (Backward Citations)
US4315146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |