Radiation imaging automatic gain control

Details Radiation imaging automatic gain control Radiation imaging automatic gain control

1988-01-13

1990-03-20

Howell, Janice A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

378 99, 358174, H04N 532

Patent

active

049105922

ABSTRACT:
An x-ray imaging system incorporating a television imaging chain is disclosed. The system includes automatic gain control circuitry, operable upon the video signal produced by the camera of the television imaging chain. The gain control circuitry affords automatic gain control capability for increasing the video gain in response to an undesired decrease in video output signal level. The gain control circuitry, however, is constrained in that it includes circuitry for establishing a minimum video gain which is always maintained during a study, irrespective of increases in brightness of an overall sample window area of the image, which could otherwise cause undesirable darkening of areas of interest in the image when the sample window also includes uninteresting structure which happens to exhibit a bright field.

REFERENCES:
patent: 3257506 (1966-06-01), Siepmann
patent: 3849650 (1974-11-01), Patten
patent: 3996420 (1976-12-01), Geluk
patent: 4013833 (1977-03-01), Zimmerman
patent: 4101776 (1978-07-01), Mansfield et al.
patent: 4204225 (1980-05-01), Mistretta
patent: 4204226 (1980-05-01), Mistretta et al.

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