Computed tomography apparatus and beam diaphragm therefor...

Details Computed tomography apparatus and beam diaphragm therefor... Computed tomography apparatus and beam diaphragm therefor...

2008-01-08

2008-01-08

Kao, Chih-Cheng G (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Collimator

C378S145000, C378S147000

Reexamination Certificate

active

07317786

ABSTRACT:
A gating device to delimit an x-ray beam, has a device housing, first and second absorber elements mounted in the device housing opposite each other, and an adjustment device for moving the absorber elements relative to each other to set a spacing therebetween forming a slit for passage of an x-ray beam therethrough. Each absorber element has an edge shaped to give the slit a slit width that varies in a longitudinal direction of the slit that increases outwardly from a central position toward respectively opposite ends of the slit. Each slit edge has a middle region producing a uniform width of the slit and further regions respectively disposed on opposite sides of the middle region that produce a linearly, longitudinally increasing slit width. The adjustment device produces a parallelogram-like relative movement between the absorber elements.

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