Radiant energy – Automatic/serial detection of similar sources
Patent
1980-04-21
1982-06-15
Smith, Alfred E.
Radiant energy
Automatic/serial detection of similar sources
250416TV, 358111, G03B 4116, N05G 130, A61B 600, H04N 532
Patent
active
043353070
ABSTRACT:
A radiographic apparatus and method are disclosed for producing an x-ray shadowgraph of a patient for display on a video monitor. The apparatus includes an x-ray source for irradiating the patient and an image intensifier for receiving the radiation which has traversed the patient. The image intensifier produces an optical image of the shadowgraphic projection of the radiation through the patient. A television camera is optically connected with the image intensifier to convert the optical image into a video signal. An image processor is provided for storing and enhancing the video signals from the television camera to produce various images on the television monitor. An automatic exposure control is provided for determining the duration which the x-ray tube should be operated for properly exposing one x-ray shadowgraphic image of the patient. The exposure control includes a photoelectric transducer which is optically coupled with the image intensifier to produce a signal which is indicative of the average intensity of the optical image. An integrator integrates the intensity signal to produce a signal which is indicative of the total light exposure. When the exposure signal reaches a predetermined level, a timer which was started as the x-ray source started emitting radiation is stopped. The time indicated on the timer indicates the duration which the x-ray source should be operated to produce and properly expose one shadowgraphic image.
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"Automatic Brightness Controls of Fluoroscopic image systems," Godbarson, Proceedings of the Society of Photo-Optical Instrumentation Engineers Medicine III vol. 47, pp. 242-247, Aug. 1-2, 1974, CGR Instruction Handbook, SR-275p, Service Manual, Septar Radiographic/Fluoroscopic X-ray Generator, (preliminary) pp. 2-76 to 2-84, Jun. 1977.
DeVries Richard C.
Hill Edwin R.
Grigsby T. N.
Smith Alfred E.
Technicare Corporation
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