Radiant energy – Calibration or standardization methods
Reexamination Certificate
2005-11-08
2005-11-08
Porta, David (Department: 2878)
Radiant energy
Calibration or standardization methods
C250S363030, C250S363040, C250S370070, C250S370100, C250S493100, C250S494100, C600S427000
Reexamination Certificate
active
06963065
ABSTRACT:
A normalization apparatus and method for a PET scanner with panel detectors for obtaining an estimate of a normalization array, for correction for count rate effects on the normalization array, and for measurement of the relation between the normalization array and the count rate. The method of the present invention is based on two quasi-independent radial and axial components, which are count rate dependent due to sensitivity changes across the detector blocks. A scatter source is disposed at the center of the FOV and a scatter-free source is disposed at the outer edge of the FOV. The method computes the normalization array through several steps which evaluate the geometric profile, the axial profile, and the correction factor. A count rate correction is introduced to extend the normalization array to any count rate.
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Casey Michael E.
Chen Mu
Conti Maurizio
Hamill James J.
CTI PET Systems, Inc.
Pitts & Brittain, P. C.
Porta David
Sung Christine
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