Computed tomography system with stable beam position

Details Computed tomography system with stable beam position Computed tomography system with stable beam position

1998-10-21

2000-07-25

Hantis, K. P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378207, 378901, A61B 600

Patent

active

060944692

ABSTRACT:
A computed tomography system having a fourfold improvement in both short-and long-term beam position stability. A beam-position detector is located at a peripheral edge of the primary fan beam and is fixed relative to the primary detectors so as to indicate beam position on the primary detectors. The beam-position detector is oriented so that its maximum sensitivity to beam motion is in the direction of beam movement due to focal spot drift due to thermal effects and gravity. Short-term focal spot drift is detected by a secondary beam out of the primary fan beam and is corrected in real time by adjusting the position of a collimator for the primary beam. Long-term changes in the focal spot position are corrected by using information from the beam-position detector to recalibrate the focal spot-beam collimator data set.

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