US3974385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray diagnostic apparatus
Assignee: Siemens AG
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Filing: 1975-06-02
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Granted: 1976-08-10
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Expires: 1995-06-02
Abstract
Abstract An X-ray diagnostic apparatus including an automatic exposure timer which measures the X-radiation dosage on a film during the exposure or X-raying of an object, and automatically interrupts the exposure when a predetermined dosage has been reached; including a programming arrangement in which the exposure data for example, the X-ray tube voltage, the initial emission current and the darkening of the film, are manually adjustable in an organ-programmed manner dependent upon the portion of a patient's body which is being X-rayed; and including a time control circuit by means of which the emission current is reduced during an exposure.
Inventors
- 👤 Stig Grim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/36; H05G1/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
In an X-ray diagnostic apparatus, and X-ray tube for projecting X-rays onto a film; an automatic exposure timer for measuring the X-ray dosage received by said film from said X-ray tube and to automatically interrupt the exposure upon said dosage reaching a predetermined value; programming means for controllably varying, in dependence upon a body portion being X-rayed, the exposure parameters including X-ray tube voltage, the initial emission current and the darkening of the film; and a timing circuit for reducing the emission current of said X-ray tube during the exposure, the improvement comprising: means connected to said programming means for regulating said timing circuit pursuant to a preselected body organ or type of examination so as to reduce the emission current of said X-ray tube to a predetermined value during the exposure in dependence upon the organ being X-rayed and to thereby increase the X-ray tube voltage.
Claim 2
Dependent Claim
147 words
In an X-ray diagnostic apparatus, and X-ray tube for projecting X-rays onto a film; an automatic exposure timer for measuring the X-ray dosage received by said film from said X-ray tube and to automatically interrupt the exposure upon said dosage reaching a predetermined value; programming means for controllably varying, in dependence upon a body portion being X-rayed, the exposure parameters including X-ray tube voltage, the initial emission current and the darkening of the film; and a timing circuit for reducing the emission current of said X-ray tube during the exposure, the improvement comprising: means connected to said programming means for regulating said timing circuit pursuant to a preselected body organ or type of examination so as to reduce the emission current of said X-ray tube to a predetermined value during the exposure in dependence upon the organ being X-rayed and to thereby increase the X-ray tube voltage.
Claim 3
Dependent Claim
72 words
An apparatus as claimed in claim 1, said exposure device comprising a high-voltage generator, an impedance connected in series to said high-voltage generator, said regulating means including switching elements for varying said impedance prior to the exposure in dependence upon a predetermined body organ or type of examination so as to cause said X-ray tube voltage to automatically increase in conformance with a programmed sequence upon a reduction of said emission current.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |