X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1992-06-15
1993-11-30
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
378108, H05G 144
Patent
active
052672956
ABSTRACT:
Method in x-ray diagnostics for regulating the exposure of a film or equivalent to an optimal level. The radiation that has passed through an object is measured by detectors and, based on this measurement, the time of exposure regulated. The measurement signals are passed from the detector or from different detectors to an amplifier associated with each detector. The amplifications of the amplifiers are initially calibrated by exposing a reference object to a predetermined dosage, passing the amplified signals from the detectors one at a time to an integrator for an initial switching period, comparing each amplified and integrated signal with a reference value, and independently adjusting the switching period of each amplified signal to produce amplification values so that each detector and amplifier gives an integrated signal equal to the reference value.
REFERENCES:
patent: 4313055 (1982-01-01), Richter
patent: 4454606 (1984-06-01), Relihan
patent: 4504962 (1985-03-01), Moore
patent: 4748648 (1988-05-01), Boucle
patent: 4748649 (1988-05-01), Griesmer et al.
patent: 4935945 (1990-06-01), Mochizuki et al.
Church Craig E.
Planmed Oy
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