Bias lighting in a radiographic apparatus and method

Details Bias lighting in a radiographic apparatus and method Bias lighting in a radiographic apparatus and method

1980-04-21

1982-11-16

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358221, 358223, 378 99, H04N 718

Patent

active

043597599

ABSTRACT:
The radiographic system includes an x-ray source for irradiating a patient with x-radiation. An image intensifier receives the x-radiation which has traversed the patient and produces an optical image of a radiation shadowgraph of the examined area of the patient. A television camera converts the optical image into a video signal. An image processor stores each frame of the video signal generated by the television camera as an electronic image of the optical image viewed on the image intensifier. Alternately, a plurality of frames from the television camera may be combined to produce a composite image. A bias light is provided adjacent the target of a television camera to illuminate the target before an optical image from the image intensifier is monitored by the television camera. This improves the linearity of the response of the television camera, particularly to low amplitude light intensities on the first few video frames generated by the camera.

REFERENCES:
patent: 3573461 (1971-04-01), Ohlsson
patent: 3582651 (1971-06-01), Siedband
patent: 3590145 (1971-06-01), Schneider
patent: 3784816 (1974-01-01), Abrahamsson
patent: 3848130 (1974-11-01), Macouski
patent: 4029948 (1977-06-01), Hounsfield
patent: 4031551 (1977-06-01), Nobutoki
patent: 4145722 (1979-03-01), Takeuti
patent: 4204225 (1980-05-01), Mistretta
patent: 4215365 (1980-07-01), Haendle
patent: 4216494 (1980-08-01), Ohshima

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