A STUDY OF DATA LOSS AND MISPOSITIONING DUE TO PILEUP IN 2-D DETECTORS IN PET

The effect of event pileup was investigated with a PET system which employs a 2-D detector-array system. Event pileup caused losses of resolution of 9%, 19.8% and 32% of the FWHM for 10, 20 and 30 mCi of positron emitter in the field of view (FOV), respectively. 9.4%, 18.7% and 28.1% of the data from the outer planes of the module were incorrectly placed in the inner planes for 5, 10, and 15 mCi of positron emitter in the FOV, respectively. A simple model of the process was formulated and was found to be adequate to describe the major features of event pileup for a number of source configurations and a wide range of activities. Copyright © 1990 by The Institute of Electrical and Electronics Engineers, Inc.