Collimation apparatus for x-ray beam correction

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

1990-04-16

1991-02-05

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378151, G01N 2300

Patent

active

049911899

ABSTRACT:
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 of 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 of 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.

REFERENCES:
patent: 4559639 (1985-12-01), Glover et al.

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