X-ray examination apparatus

X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling

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378 987, H04N 100

Patent

active

055330860

ABSTRACT:
An x-ray examination apparatus includes an imaging control for adjusting amplification of a primary video signal that is supplied by an image acquisition device, e.g., a television pick-up tube. By increasing the average video signal level, electronic noise is reduced. White-compression is performed so as to match the dynamic range of the amplified video signal to the range of an analog-to-digital converter for converting the amplified video signal to digital format. However, excessive white compression leads to deterioration of diagnostic quality. To avoid image artifacts associated with excessive white compression, both amplification of the primary video signal and white-compression are performed depending on the average signal level and the dynamic range of the primary video signal.

REFERENCES:
patent: 4636954 (1987-01-01), Komatsu
patent: 4700299 (1987-10-01), Kimura et al.
patent: 4910592 (1990-03-01), Shroy, Jr. et al.
patent: 5003572 (1991-03-01), Meccariello et al.
patent: 5128751 (1992-07-01), Ohara
"Physical Image Quality Evaluation of a Digital Spot Fluorography System" A. R. Cowen et al, Phys. Med. Biol. 1992, vol. 37, No. 2, pp. 325-342.

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