Gamma camera with automatic adjustment of the energy spectrum

摘要

A nuclear camera system is provided in which the energy spectrum peaks identified by a camera detector head are automatically adjusted to account for drift and other sources of inaccuracy. Histograms of events detected by the photomultiplier tubes of the detector head are acquired continuously and updated periodically. A system operator initiates the adjustment with an autopeaking command which causes the system to ascertain the validity of the histogram data and, if it is valid, to determine a peak energy level. The determined level is compared to a theoretical value for an isotope present and the comparison is used to adjust the gain applied to energy data of the detector head.