X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1991-11-27
1993-08-24
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
358111, 378108, H05G 164
Patent
active
052395677
ABSTRACT:
The invention relates to an X-ray imaging system, comprising an X-ray source for emitting an X-ray beam, a power supply unit which is connected to the X-ray source, an X-ray detector for converting the X-ray beam into an optical image, a television pick-up device for converting the optical image into a video signal, a detection device which is connected to the television pick-up device and which serves to form a control signal from the video signal, an output of the detection device being connected to the power supply unit for adjustment thereof, and a display unit which is connected to the output of the television pick-up device via an amplifier (18). When the reciprocal of the signal generated by the detection device is used as the gain factor for the amplifier, a stable brightness is obtained on the television monitor without giving rise to a light flash when the X-ray source is switched on. As a result, the duration of exposure can be reduced during medical imaging so that the dose applied is less and motional unsharpness is reduced.
REFERENCES:
patent: 4101776 (1978-07-01), Mansfield et al.
patent: 4628357 (1986-12-01), Fenster
patent: 4703496 (1987-10-01), Meccariello et al.
patent: 5003572 (1991-03-01), Meccariello et al.
Church Craig E.
Slobod Jack D.
U.S. Philips Corp.
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