Assembly for radiographic imaging

Details Assembly for radiographic imaging Assembly for radiographic imaging

1992-10-22

1993-11-02

Porta, David P.

X-ray or gamma ray systems or devices

Photographic detector support

Sheet film cassette

378149, 378154, G03B 4204

Patent

active

052590160

ABSTRACT:
An X-ray imaging assembly is disclosed comprised of (I) a front and back pair of intensifying screens, (II) a radiographic element mounted between the intensifying screens, and (III) a collimating grid The front screen being chosen to exhibit modulation transfer factors greater than those of reference curve A in FIG. 2 . The radiographic element is comprised of a transparent film support, a front silver halide emulsion layer unit coated on the support and located adjacent the front intensifying screen, a back silver halide emulsion layer unit coated on the support and located adjacent the back intensifying screen, and means for reducing crossover to less than 10 percent. The X-ray collimating grid, located to receive X-radiation prior to the front screen, is comprised of an X-ray opaque material forming an array of at least 85 X-ray transmission apertures per inch providing at least 50 percent open area. The apertures have nonlinear boundaries and a ratio of maximum to minimum cross-sectional widths ranging from 1:1 to 3:2.

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