US4239972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for computed tomography
Assignee: US Philips Corp
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Filing: 1979-03-30
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Granted: 1980-12-16
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Expires: 1999-03-30
Abstract
Abstract A device for examining an object with penetrating radiation, comprises a closed array of switchable radiation sources, which are arranged inside a flat disc-shaped space and enclose the object, and a closed array of transparent radiation detectors which is arranged within the array of radiation sources. During an examination, the radiation sources emit a beam of radiation which penetrates the neighboring detectors and irradiate the object from different directions. Transmitted radiation is measured by detectors which are situated behind the object.
Inventors
- 👤 Wolfgang Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:45
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/083; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/40; A61B6/4007; A61B6/42; A61B6/4275
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
93 words
A device for examining an object comprising: a plurality of individually controlled radiation source means, disposed in a planar array around the object, which function to irradiate the object, from different directions, with a beam of penetrating radiation, and a closed array of radiation detectors, disposed around the object within the array of source means and lying substantially in the plane thereof, the detectors functioning to measure radiation from the source means which is transmitted through the object and being at least partially transmissive of radiation from the source means to the object.
Claim 2
Independent Claim
93 words
A device for examining an object comprising: a plurality of individually controlled radiation source means, disposed in a planar array around the object, which function to irradiate the object, from different directions, with a beam of penetrating radiation, and a closed array of radiation detectors, disposed around the object within the array of source means and lying substantially in the plane thereof, the detectors functioning to measure radiation from the source means which is transmitted through the object and being at least partially transmissive of radiation from the source means to the object.
Claim 3
Dependent Claim
37 words
A device as claimed in claim 1 wherein the radiation detectors are disposed and shaped so that radiation generated by the source means is, when viewed from the object, substantially uniformly spatially attenuated by the radiation detectors.
Claim 4
Dependent Claim
19 words
A device as claimed in claim 2 wherein the radiation detectors absorb approximately fifty percent of radiation incident thereon.
Claim 5
Dependent Claim
59 words
A device as claimed in any of claim 1, 2 or 3 wherein each of the radiation detectors comprises a scintillator and a light detector, the light detector functioning to measure scintillation light produced in the scintillator, the radiation source means and scintillators being disposed within a disc-shaped space and light detectors being disposed outside of the disc-shaped space.
Claim 6
Dependent Claim
83 words
A device as claimed in claim 1, 2 or 3 wherein each of the radiation detectors comprises: a plurality of scintillators; light detector means which function to measure light produced by the scintillators; and a plurality of light conductors which transmit the light from the scintillators to the light detector means and which are transmissive of the penetrating radiation; the radiation source means and scintillators being disposed within a disc-shaped space and the light detector means being disposed outside of the disc-shaped space.
Claim 7
Dependent Claim
80 words
A device as claimed in claim 4 wherein each of the radiation detectors comprises: a plurality of scintillators; light detector means which function to measure light produced by the scintillators; and a plurality of light conductors which transmit the light from the scintillators to the light detector means and which are transmissive of the penetrating radiation; the radiation source means and scintillators being disposed within a disc-shaped space and the light detector means being disposed outside of the disc-shaped space.
Claim 8
Dependent Claim
55 words
A device as claimed in claim 5 wherein each of the radiation detectors comprises: a plurality of radiation absorbing scintillators which are spaced, one from the other, to define a plurality of radiation transmitting apertures; and further comprising a radiation absorbing shield is disposed between each of the radiation absorbing scintillators and adjacent source means.
Claim 9
Dependent Claim
56 words
A device as claimed in claim 6 wherein each of the radiation detectors comprises: a plurality of radiation absorbing scintillators which are spaced, one from the other, to define a plurality of radiation transmitting apertures; and further comprising a radiation absorbing shield is disposed between each of the radiation absorbing scintillators and an adjacent source means.
Claim 10
Independent Claim
44 words
A device as claimed in claims 1, 2 or 3 wherein at least one radiation detector which is disposed between a radiation source means and the object further functions to measure the intensity of radiation which is incident on the object from that source.
Claim 11
Dependent Claim
41 words
A device as claimed in claim 4 wherein at least one radiation detector which is disposed between a radiation source means and the object further functions to measure the intensity of radiation which is incident on the object from that source.
Claim 12
Dependent Claim
41 words
A device as claimed in claim 5 wherein at least one radiation detector which is disposed between a radiation source means and the object further functions to measure the intensity of radiation which is incident on the object from that source.
Claim 13
Dependent Claim
41 words
A device as claimed in claim 6 wherein at least one radiation detector which is disposed between a radiation source means and the object further functions to measure the intensity of radiation which is incident on the object from that source.
Claim 14
Dependent Claim
41 words
A device as claimed in claim 7 wherein at least one radiation detector which is disposed between a radiation source means and the object further functions to measure the intensity of radiation which is incident on the object from that source.
Claim 15
Dependent Claim
41 words
A device as claimed in claim 8 wherein at lest one radiation detector which is disposed between a radiation source means and the object further functions to measure the intensity of radiation which is incident on the object from that source.
References Cited (Backward Citations)
US4031395A
Cited
US4153842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |