Method and apparatus for radiography

Details Method and apparatus for radiography Method and apparatus for radiography

1991-11-15

1993-05-18

Porta, David F.

X-ray or gamma ray systems or devices

Beam control

Antiscatter grid

378146, 378154, G21K 100

Patent

active

052127192

ABSTRACT:
A method and apparatus for radiographic techniques using an x-ray source (13). The radiographed object (M) is subjected to a beam (X) of radiation which is employed for forming a radiographic image of the object (M) onto a film (25). Between the radiographed object (M) and the film (25) is utilized a grid assembly (20) that prevents the disturbing effect of backscattered radiation or secondary radiation generated in the radiographed object on the radiographed image. The grid assembly (20) comprises a grid plate (22) having several equidistantly spaced lamellas opaque to x-rays. The x-rays can pass in the direction of the beam axis between the spaces (24) of said lamellas to the film (25). The grid plate is reciprocatingly oscillated at a varying amplitude so that the stops and changes of travel direction (K.sub.1 . . . K.sub.5) are appropriately evenly distributed over the interlamellar spaces of the grid plate (22), thereby avoiding the imaging the grid lamellas (23) in a disturbing manner onto the film (25) or other imaging means.

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