CALIBRATION OF DETECTOR SENSITIVITY IN POSITRON CAMERAS

An improved method for calibrating detector sensitivities in a positron camera has been developed. The calibration phantom is a cylinder of activity placed near the center of the camera and fully within the field of view. The calibration data is processed in such a manner that the following two important properties are achieved. (1) The estimate of a detector sensitivity is uneffected by the sensitivities of the other detectors. (2) The estimates are insensitive to displacements of the calibrating phantom from the camera center. Both of these properties produce a more accurate detector calibration. Copyright © 1990 by The Institute of Electrical and Electronics Engineers, Inc.