X-ray or gamma ray systems or devices – Photographic detector support – Sheet film cassette
Patent
1989-05-10
1990-12-18
Howell, Janice A.
X-ray or gamma ray systems or devices
Photographic detector support
Sheet film cassette
378175, 378167, G03B 4204
Patent
active
049792016
ABSTRACT:
An X-ray imaging system for obtaining a photographic image of the X-ray transmissivity of a body is disclosed. A source of X-rays is directable at the body, and an X-ray imaging subsystem is provided for receiving a pattern of X-rays transmitted through the body, including, in combination: a first X-ray-sensitive screen for converting the pattern of X-rays to a first pattern of light; a light-sensitive film adjacent the first X-ray sensitive screen for receiving the first pattern of light; a second X-ray sensitive screen for also converting the pattern of X-rays to the first pattern of light; an array of light detecting devices positioned to receive the first pattern of light from the second X-ray sensitive screen; means for storing electronic representations of the outputs of the array of light detecting devices; and light generating means responsive to the stored electronic representations for generating a second pattern of light which is directed at and received by the light-sensitive film. An image is formed on the light-sensitive film as a result of being exposed to said first and second patterns of light. The disclosed invention permits use of a standard type of film cassette and provides improvement on the standard radiographic technique in the following ways: (1) The recorded film contrast in low X-ray exposure regions that ordinarily would have been recorded in under-exposed regions of a film's characteristic curve will be increased significantly. (2) The overall range of light transmission that must be viewed by the radiologist will be decreased without sacrificing diagnostic information.
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Chu Kim-Kwok
Howell Janice A.
Innovative Imaging Sciences, Inc.
Novack Martin M.
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