Bow-tie X-ray filter assembly for dual energy tomography

Details Bow-tie X-ray filter assembly for dual energy tomography Bow-tie X-ray filter assembly for dual energy tomography

1990-03-26

1990-12-04

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 18, 378156, G21K 300

Patent

active

049759337

ABSTRACT:
A polymer attenuation filter in a CT machine is mounted at its center and allowed to expand freely at its ends to prevent cracking of the filter as it expands with temperature and after it becomes brittle with x-ray exposure. Vertical expansion of the filter at its center is accommodated by a stress relief hole cut between the center fastening points. Relatively greater horizontal expansion is accommodated by means of spring clamping. Difference in expansion between a metallic strip filter and its support is accommodated by tightly affixing the ends of the filter to the support so that the metallic strip is always under tension and cannot buckle.

REFERENCES:
patent: 4288695 (1981-09-01), Walters et al.
patent: 4399550 (1983-08-01), Hauck et al.

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