Method and apparatus for obtaining a selectable contrast image in an X-ray film
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United States of America Patent
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Apr 9, 1991
Grant Date -
N/A
app pub date -
Dec 20, 1989
filing date -
Dec 20, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a method and apparatus for obtaining a selectable contrast image in an X-ray exposure. The method comprises applying a controlled high voltage to an X-ray tube in response to a controlled invertor-generated voltage; generating the controlled invertor-generated voltage; driving the invertor in response to a KV control signal; comparing a KV feedback signal with a KV reference signal for developing said KV control signal, and selecting any of a plurality of variable level reference signals as the KV reference signal. The apparatus comprises means for carrying out the foregoing method.
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