X-ray examination apparatus having a stray radiation grid with a

Details X-ray examination apparatus having a stray radiation grid with a X-ray examination apparatus having a stray radiation grid with a

1990-03-16

1990-11-06

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Beam control

Collimator

378147, 378154, G21K 102

Patent

active

049691767

ABSTRACT:
In apparatus for radiographic diagnostics an X-ray beam attenuated by an object to be examined is converted into a light image by means of an X-ray image intensifier tube. Inter alia as a result of the geometry of the X-ray beam and of the input screen of the X-ray image intensifier tube the intensity of the image decreases towards the edge (vignetting). By arranging a stray radiation grid, for example, in the form of a perforated plate of X-ray-absorbing material, for example, lead or tungsten, in the path of radiation between the X-ray source and the X-ray image intensifier tube, vignetting can be reduced by an adapted variation of the local transmission of the stray radiation grid.

REFERENCES:
patent: 2407938 (1946-09-01), Schonander
patent: 2638554 (1953-05-01), Bartow et al.
patent: 3373286 (1968-03-01), Han
patent: 3748470 (1973-07-01), Barrett
patent: 3793520 (1974-02-01), Grenier
patent: 4020356 (1977-04-01), Brahme
patent: 4220890 (1980-09-01), Beekmans
patent: 4825454 (1989-04-01), Annis et al.

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