US3586860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray plant for both radioscopy and photography
Assignee: Saab AB
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Filing: 1969-04-04
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Granted: 1971-06-22
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Expires: 1989-04-04
Abstract
Abstract Plural transducer elements, comprising a single transducer, are associated with an X-ray tube to produce an output which varies with average intensity of X-ray radiation. The transducer element outputs are summed, averaged and amplified, and are corrected for factors common to both radioscopy and photography, then fed, through a selector switch, either to a dose velocity controlling device which maintains radiation intensity at a desired level for radioscopy, or to an exposure controlling device which times photographic exposures.
Inventors
- 👤 Soren Borje Edhard Borjesson
- 👤 Rolf Gosta Nyden
- 👤 Stig Arne Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:42
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
In an X-ray examination plant having an X-ray generator, means for controlling the generator by reference to the output from a transducer, which output has a magnitude that is a function of the intensity of radiation from the generator that has passed a subject being examined, said control means being characterized by: A. signal correction means connected with the transducer for modifying the output thereof in accordance with characteristics of the generator-transducer combination that must be taken into account in controlling the generator for both radioscopy and photography; B. selector switch means connected with the signal correction means and alternatively movable to each of two positions; C. exposure duration control means connected with the selector switch means to be connectable therethrough, in one of its said positions, with the signal correction means, for timing operation of the generator in photography in accordance with said magnitude of the transducer output; and D. radiation intensity control means connected with the selector switch means to be connectable therethrough, in the other of its said positions, with the signal correction means, for so controlling the generatoR for radioscopy as to maintain said magnitude of the transducer output substantially constant.
Claim 2
Dependent Claim
195 words
In an X-ray examination plant having an X-ray generator, means for controlling the generator by reference to the output from a transducer, which output has a magnitude that is a function of the intensity of radiation from the generator that has passed a subject being examined, said control means being characterized by: A. signal correction means connected with the transducer for modifying the output thereof in accordance with characteristics of the generator-transducer combination that must be taken into account in controlling the generator for both radioscopy and photography; B. selector switch means connected with the signal correction means and alternatively movable to each of two positions; C. exposure duration control means connected with the selector switch means to be connectable therethrough, in one of its said positions, with the signal correction means, for timing operation of the generator in photography in accordance with said magnitude of the transducer output; and D. radiation intensity control means connected with the selector switch means to be connectable therethrough, in the other of its said positions, with the signal correction means, for so controlling the generatoR for radioscopy as to maintain said magnitude of the transducer output substantially constant.
Claim 3
Dependent Claim
23 words
The X-ray plant of claim 1, further characterized by: said signal correcting means being arranged to correct for dark current of the transducer.
Claim 4
Dependent Claim
165 words
The X-ray plant of claim 1 wherein the transducer comprises a plurality of transducer elements, each responsive to a different portion of the radiation from the generator that has passed a subject being examined, further characterized by said signal correcting means comprising: A. a plurality of dark current correction means, one connected with each transducer element for correcting the output therefrom to compensate for the dark current thereof; B. summation means connected with all of said dark current correction means to combine the corrected outputs of the several transducer elements; C. amplifier means having its input connected with the output of said summation means and having a controllable amplification factor; and D. control means connected with the several transducer elements and with the amplifier means for simultaneously controlling the number of transducer elements in operation and the amplification factor of the amplifier so that the output of the amplifier is a function of the average of the corrected outputs of the transducer elements in operation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |