US4134020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring local absorption differences
Assignee: US Philips Corp
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Filing: 1977-09-26
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Granted: 1979-01-09
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Expires: 1997-09-26
Abstract
Abstract The radiation source of a fan-beam X-ray scanner is adjustable relative to the body to be examined so that the beam exactly covers the body. Use can be made of the radiation which passes besides the body for adjustment of the optimum distance. The variation of the enlargement factor which is caused by adjustment is recorded and is applied to an arithmetic unit for use in calculating the absorption values.
Inventors
- 👤 Frans W. Zonneveld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:31
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/083; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/58; A61B6/589
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
Apparatus for determining local absorption differences in a body, comprising a radiation source for generating a fan-shaped beam of penetrating radiation which irradiates the body, detector means which are location-sensitive in at least one direction, scanning means for orbiting said source and detector means about a central axis which passes through said body, the radiation source and the detector means always being situated opposite each other, one on each side of said central axis, and means for adjusting the distance between said central axis and the radiation source and/or the detector means to which adapt the beam width in the region occupied by the body to a relevant dimension of the body.
Claim 2
Dependent Claim
112 words
Apparatus for determining local absorption differences in a body, comprising a radiation source for generating a fan-shaped beam of penetrating radiation which irradiates the body, detector means which are location-sensitive in at least one direction, scanning means for orbiting said source and detector means about a central axis which passes through said body, the radiation source and the detector means always being situated opposite each other, one on each side of said central axis, and means for adjusting the distance between said central axis and the radiation source and/or the detector means to which adapt the beam width in the region occupied by the body to a relevant dimension of the body.
Claim 3
Dependent Claim
28 words
Apparatus as claimed in claim 1, in which the radiation source and the detector are displaceable together along an axis connecting the radiation source with the detector means.
Claim 4
Dependent Claim
41 words
Apparatus as claimed in claim 1, in which one element of an assembly system formed by the combination of the radiation source and the detector means can be separately displaced along an axis connecting the radiation source with the detector means.
Claim 5
Dependent Claim
24 words
Apparatus as claimed in claim 1, further, including means for automatically adjusting the distance between the radiation source and the body to an optimum.
Claim 6
Dependent Claim
38 words
Apparatus as claimed in claim 1, further including detectors means for measuring radiation which has not passed through the body and for adjusting the position of the radiation source relative to the body in response to said measuring.
Claim 7
Dependent Claim
37 words
Apparatus as claimed in claim 1, further including adjustment means which function to control the intensity of the beam emitted by the radiation source in a manner dependent on the distance between the source and the body.
References Cited (Backward Citations)
US3922552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |