US4400821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the measurement of the X-ray tube high voltage
Assignee: Siemens AG
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Filing: 1982-03-31
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Granted: 1983-08-23
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Expires: 2002-03-31
Abstract
Abstract In an exemplary embodiment, two radiation detectors are present which are covered on their inlet sides for the radiation by two x-ray filters of different absorption. A divider divides the two output signals of the radiation detectors so that its output signal is a measure of the time variation of x-ray tube voltage during an exposure. The output signal of the divider is supplied to a time measurement circuit which provides a measure of the exposure time during which the x-ray tube voltage is greater than or equal to a predetermined value.
Inventors
- 👤 Horst Aichinger
- 👤 Heinz E. Kranberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/265; G; G01; G01R; G01R15/00; G01R15/14; G01R15/144
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
Apparatus for the measurement of the x-ray tube high voltage of an x-ray diagnostic system, said apparatus including x-ray filters of different absorption, radiation detectors (3, 4) which are covered on their input sides for the radiation by the respective x-ray filters (5, 6) of different absorption, and a divider (9) for the output signals of the radiation detectors (3, 4) characterized in that a time measurement circuit is connected with the output of the divider (9) said time measurement circuit (16 through 24) comprising means for detecting the exposure time while the x-ray tube voltage is greater than or equal to a predetermined value.
Claim 2
Dependent Claim
105 words
Apparatus for the measurement of the x-ray tube high voltage of an x-ray diagnostic system, said apparatus including x-ray filters of different absorption, radiation detectors (3, 4) which are covered on their input sides for the radiation by the respective x-ray filters (5, 6) of different absorption, and a divider (9) for the output signals of the radiation detectors (3, 4) characterized in that a time measurement circuit is connected with the output of the divider (9) said time measurement circuit (16 through 24) comprising means for detecting the exposure time while the x-ray tube voltage is greater than or equal to a predetermined value.
Claim 3
Dependent Claim
103 words
Apparatus according to claim 1, characterized in that the time measurement circuit (16 through 24) includes a percent circuit (16, 17) connected with said divider (9) for the formation of a signal which corresponds to a specific percentage of the peak value of the x-ray tube voltage, and that a comparator (19) is present which compares the signal of the percent member (16, 17) with the respective value of the x-ray tube voltage, and a counter (22) controlled by the comparator such that the comparator activates the counter (22) while the x-ray tube voltage lies above the selected percentage of the peak value.
References Cited (Backward Citations)
US3515873A
Cited
US4361900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |