X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1989-01-10
1992-01-28
Howell, Janice A.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
378 99, 378207, 358111, H05G 138
Patent
active
050849115
ABSTRACT:
A phototimer for controlling x-ray exposure includes an array of x-ray sensors, and digital processing electronics for calculating x-ray exposure by selecting one or more signals from the x-ray sensors, and calculating the x-ray exposure from the selected signals. After calculating the x-ray exposure, the calculated exposure is employed to control the x-ray exposure either by displaying the calculated exposure to an operator who compares the calculated exposure with a desired exposure and repeats the exposure if necessary, or by automatically terminating the exposure by sending a control signal to the x-ray source. The improvement in the state of x-ray phototimer technology resides in the automatic selection of a subset of signals from a plurality of photosensors, thereby improving the reliability of the measurement. In prior art devices, the signals from a plurality of sensors were either selected manually by a switch, or all employed in a predetermined algorithm.
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Frank Lee F.
Moore William E.
Schaetzing Ralph
Sezan Muhammed I.
Eastman Kodak Company
Howell Janice A.
Noval William F.
Wong Don
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