X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
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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Bowers James
Deych Ruvin
Dobbs John
Analogic Corporation
Hantis K. P.
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