X-ray examination apparatus and filter suitable for use therein

Details X-ray examination apparatus and filter suitable for use therein X-ray examination apparatus and filter suitable for use therein

1991-04-08

1992-09-15

Porta, David P.

X-ray or gamma ray systems or devices

Beam control

Filter

378159, G21K 110

Patent

active

051484650

ABSTRACT:
A lens-like X-ray filter is filled with a liquid, the filter having flexible walls, the filter being between an X-ray source and an X-ray detector in an X-ray examination apparatus. The filter obviates brightness variations in an X-ray image caused by vignetting. The filter thickness is adjustable by the supply and the discharge of a liquid, the filter preserving a quadratic thickness variation from the center to the edges.

REFERENCES:
patent: 3755672 (1973-08-01), Edholm et al.
patent: 4101766 (1978-07-01), Minami et al.
patent: 4300055 (1981-11-01), Taumann
patent: 4481419 (1984-11-01), Persyk

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