Collimation apparatus for x-ray beam correction

Details Collimation apparatus for x-ray beam correction Collimation apparatus for x-ray beam correction

A - Human Necessities

61

B

358/11.1

A61B 6/03 (2006.01) A61B 6/06 (2006.01) G21K 1/02 (2006.01)

Patent

CA 2034329

Abstract of the Disclosure 15CT03280 A computed tomography system corrects image errors resulting from misalignment of the fan beam as a result of placement of the x-ray tube, thermal drift of the x-ray tube anode or mechanical stresses of the gantry or x-ray tube. Misalignment is determined alternately by means of a z-axis offset detector which detects movement of the exposure area of the CT fan beam or a predictive model that calculates thermal drift or mechanical deflection of the focal spot of the x-ray tube based on previous use. The system includes a collimator with a controllable z-axis position which may be controlled to reduce z-axis offset of the fan beam exposure area or to make the fan beam more parallel with the imaging plane of the CT system.

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