US4258256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for examining a body by means of penetrating radiation
Assignee: US Philips Corp
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Filing: 1978-12-21
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Granted: 1981-03-24
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Expires: 1998-12-21
Abstract
Abstract A body is irradiated by a primary radiation beam; the scattered radiation produced thereby is incident on a detector device consisting of a plurality of detectors and is a measure for the density distribution of materials in the primary beam. However, this gives rise to multiple scattered radiation which disturbs the measurement. The present invention provides a device in which disturbance by multiple scattered radiation is greatly reduced, without any significant effect on the scattered radiation originating from the primary beam. A device in accordance with the invention is provided with flat laminations which are arranged between the primary beam and the detector device and which are aligned with the primary beam in a fan of flat planes.
Inventors
- 👤 Geoffrey Harding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:41
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/48; A61B6/483; A61B6/06; G; G21; G21K; G21K1/00; G21K1/02; G21K1/025; A61B6/42; A61B6/4291
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
In a device for examining a body of the type comprising means for projecting penetrating radiation through the body in a primary beam of small cross-section area, whereby scattered radiation is produced by interaction of radiation in the primary beam with materials in the body, a plurality of radiation detectors, and slit aperture means which function to transmit the scattered radiation from the body to the detectors, the improvement comprising: laminar radiation absorbing means, disposed between the body and the detectors, which function to transmit scattered radiation, which originates in the region of the primary beam, to the detectors and to attenuate scattered radiation, which originates outside of the primary beam and which propagates towards the detectors.
Claim 2
Dependent Claim
117 words
In a device for examining a body of the type comprising means for projecting penetrating radiation through the body in a primary beam of small cross-section area, whereby scattered radiation is produced by interaction of radiation in the primary beam with materials in the body, a plurality of radiation detectors, and slit aperture means which function to transmit the scattered radiation from the body to the detectors, the improvement comprising: laminar radiation absorbing means, disposed between the body and the detectors, which function to transmit scattered radiation, which originates in the region of the primary beam, to the detectors and to attenuate scattered radiation, which originates outside of the primary beam and which propagates towards the detectors.
Claim 3
Dependent Claim
59 words
The improvement of claim 1 wherein the laminar radiation absorbing means comprise a plurality of laminations of a material having a high absorption factor for radiation, said laminations being spaced one from the other and disposed so that an extension of each lamination would at least approximately extend through the primary beam along the entire length of the beam.
Claim 4
Dependent Claim
34 words
The improvement claimed in claims 1 or 2 wherein the laminations are flat plates and are disposed in planes which intersect in a straight line which at least approximately coincides with the primary beam.
Claim 5
Dependent Claim
71 words
A device as claimed in claim 3 wherein ends of the laminations which are closest to the primary beam are spaced, one from the other, at a distance of approximately S=wL/L p where w is the diameter of the cross section of the primary beam, LP p is the distance between the primary beam and the detectors, and L is the distance between the ends of the laminations and the detectors.
References Cited (Backward Citations)
US1164987A
Cited
US4124804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |