Scanning equalization radiography

Details Scanning equalization radiography Scanning equalization radiography

1988-09-13

1990-11-20

Howell, Janice A.

X-ray or gamma ray systems or devices

Beam control

Scanner

378145, 378156, G21K 510

Patent

active

049724584

ABSTRACT:
A radiographic machine in which the exposure is equalized as between different areas of the image plane so as to enhance high spatial frequency features of the image and suppress low spatial frequency features and achieve other benefits as well. A fan beam which is wide enough to encompass the object being imaged is swept across the object and segments of that beam are individually pulse width modulated at each of a number of sampling intervals during the sweep by monastable or bistable shutter pins which either completely block or completely uncover the sectors which they control. An alternate embodiment adds beam width moulation as well, by making the shutter pins either completely block their sectors of uncover them only to the degree necessary for beam width modulation.

REFERENCES:
patent: 3755672 (1973-08-01), Edholm et al.
patent: 4675893 (1987-06-01), Duinker et al.
patent: 4677652 (1987-06-01), Duinker et al.
patent: 4715056 (1987-12-01), Vlasbloem et al.
patent: 4741012 (1988-04-01), Duinker et al.
patent: 4773087 (1988-09-01), Plewes
patent: 4785471 (1988-11-01), Boersma

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