X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1984-05-16
1985-12-31
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378 99, H05G 144
Patent
active
045625867
ABSTRACT:
An X-ray image pick-up device includes an X-ray source for radiating X-rays onto an object including a region of interest, an image intensifier for converting to an optical image an X-ray image obtained when the X-rays radiated from the X-ray source are transmitted through the object, an image pick-up camera for converting to an image pick-up signal the optical image which is generated from the image intensifier, and an optical diaphragm arranged between the image intensifier and the image pick-up camera for adjusting an amount of optical image light incident on the image pick-up camera. The X-ray image pick-up device further includes an exposure controller for detecting both the maximum value of image pick-up signals from the pick-up camera and the average value of the image pick-up signals in the region of interest at a time of fluoroscopic examination, for calculating the density resolutions of the output pick-up signals from the image pick-up camera with respect to the various combinations of tube voltages, tube currents and optical diaphragm values, and for determining a tube voltage and a tube current of an X-ray source, along with an optical diaphragm value so as to provide a maximum density resolution which permits the device to always operate under optimal exposure conditions.
REFERENCES:
patent: 4423521 (1983-12-01), Haendle
patent: 4473843 (1984-09-01), Bishop
patent: 4479231 (1984-10-01), Haendle
Honda Michitaka
Takami Osamu
Church Craig E.
Kabushiki Kaisha Toshiba
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