X-ray diagnostics installation with a gating unit for the domina

Details X-ray diagnostics installation with a gating unit for the domina X-ray diagnostics installation with a gating unit for the domina

1991-01-16

1991-11-19

Howell, Janice A.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 98, 358111, H05G 164

Patent

active

050671421

ABSTRACT:
An x-ray diagnostics installation for producing x-ray images has an x-ray image intensifier and a detector for measuring the average image brightness in a dominant region of the output screen of the x-ray image intensifier, and a gating unit with which the size and position of the dominant region can be varied. The gating unit is in the form of a tape roll of opaque material having a number of differently sized and shaped openings therein, corresponding to different desired measuring fields. A large number of differing dominant regions can thereby be selected by means of a unit which occupies a small space.

REFERENCES:
patent: 3539813 (1970-11-01), Resnick
patent: 4335307 (1982-06-01), DeVries et al.

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