Exposure control circuit for X-ray generation

Details Exposure control circuit for X-ray generation Exposure control circuit for X-ray generation

1992-04-20

1993-01-12

Hannaher, Constantine

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 97, 378110, 378112, H05G 138

Patent

active

051795825

ABSTRACT:
An exposure control circuit captures an X-ray generator exposure time for a master exposure and replicates that time for subsequent exposures in a series. In one preferred circuit an read counter bank counts down clock pulses during the master exposure time, and then this count is held and is used by a write counter bank which counts up during subsequent exposures. A control circuit controls loading an enabling functions of the read and write counters. For the subsequent exposures, an output relay circuit terminates the X-ray generator exposure when the write counter bank reaches a predetermined count. This arrangement is used favorably with digital subtractive angiography (DSA).

REFERENCES:
patent: 26497 (1868-12-01), Splain
patent: 2122222 (1938-06-01), Vingerhoets
patent: 2788453 (1957-04-01), Lusted
patent: 3428809 (1969-02-01), Daniels et al.
patent: 3792267 (1974-02-01), Westerkowksy
patent: 4335307 (1982-06-01), DeVries et al.
patent: 4358684 (1982-12-01), Greiner et al.
patent: 4639943 (1987-01-01), Heinze et al.
patent: 4796286 (1989-01-01), Ochmann et al.

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