US4047041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray detector array
Assignee: General Electric Co
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Filing: 1976-04-19
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Granted: 1977-09-06
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Expires: 1996-04-19
Abstract
Abstract An ionization chamber array, useful in computerized X-ray tomography apparatus comprises a plurality of substantially parallel, rod-like cathodes disposed equi-distant between parallel planar anodes in a high pressure detector gas. X-ray energy enters the array in the plane of the cathodes in a direction substantially parallel to their long dimensions.
Inventors
- 👤 John M. Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:15
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/02; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/40; A61B6/4007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
An ion chamber detector array for determining the distribution of x-ray intensities in one or more flat, coplanar, x-ray beams comprising: a first flat anode sheet disposed in a plane lying parallel to the plane of said x-ray beams; a second, flat anode sheet disposed parallel to said first anode sheet, a third, flat anode sheet disposed parallel to and adjacent a side of said first anode sheet opposite said second anode sheet; a first plurality of rod-like cathode elements disposed in said x-ray beam and equi-distant between said first anode sheet and said second anode sheet, a long dimension of said cathode elements being oriented in a direction substantially parallel to the angle of incidence of one or more of said x-ray beams; a second plurality of rod-like cathode elements disposed in said x-ray beam and equi-distant between said first anode sheet and said third anode sheet, a long dimension of said cathode elements being oriented in a direction substantially parallel to the angle of incidence of one or more of said x-ray beams; a gaseous detecting medium disposed between said first anode sheet, and second anode sheet, said third anode sheet, and said cathodes; means for applying an electric potential between said cathodes and said anodes, whereby an electric field is impressed between said cathodes and said anodes, and for connecting each of said cathodes to a signal processing circuit.
Claim 2
Dependent Claim
232 words
An ion chamber detector array for determining the distribution of x-ray intensities in one or more flat, coplanar, x-ray beams comprising: a first flat anode sheet disposed in a plane lying parallel to the plane of said x-ray beams; a second, flat anode sheet disposed parallel to said first anode sheet, a third, flat anode sheet disposed parallel to and adjacent a side of said first anode sheet opposite said second anode sheet; a first plurality of rod-like cathode elements disposed in said x-ray beam and equi-distant between said first anode sheet and said second anode sheet, a long dimension of said cathode elements being oriented in a direction substantially parallel to the angle of incidence of one or more of said x-ray beams; a second plurality of rod-like cathode elements disposed in said x-ray beam and equi-distant between said first anode sheet and said third anode sheet, a long dimension of said cathode elements being oriented in a direction substantially parallel to the angle of incidence of one or more of said x-ray beams; a gaseous detecting medium disposed between said first anode sheet, and second anode sheet, said third anode sheet, and said cathodes; means for applying an electric potential between said cathodes and said anodes, whereby an electric field is impressed between said cathodes and said anodes, and for connecting each of said cathodes to a signal processing circuit.
Claim 3
Dependent Claim
16 words
The detector array of claim 1 wherein said cathode elements are parallel, one to the other.
Claim 4
Dependent Claim
24 words
The detector of claim 1 wherein said gaseous medium comprises elements of atomic weight greater than or equal to the atomic weight of argon.
Claim 5
Dependent Claim
25 words
The detector array of claim 3 wherein said gaseous medium is selected from the group of gases consisting of argon, krypton, xenon, and mixtures thereof.
Claim 6
Dependent Claim
11 words
The detector of claim 4 wherein said gaseous medium is xenon.
Claim 7
Dependent Claim
21 words
The detector of claim 1 wherein said gaseous detecting medium has a pressure between approximately 10 atmospheres and approximately 100 atmospheres.
Claim 8
Dependent Claim
22 words
The detector of claim 6 further comprising a pressure vessel disposed about and containing said anodes, said cathodes, and said gaseous medium.
Claim 9
Dependent Claim
22 words
The detector of claim 7 wherein said pressure vessel comprises a window lying perpendicular to and adjacent said anodes and said cathodes.
Claim 10
Dependent Claim
22 words
The detector of claim 1 wherein said cathode elements comprise strips of electricity conductive material disposed on a sheet of dielectric material.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |