Position calculation in a scintillation camera

摘要

For accurate position calculation of scintillation events in a gamma camera, improved methods are disclosed calibrating gain of photodetectors. The camera system may comprise an array of LEDs optically coupled to a scintillator crystal in which signals from photodetectors also coupled to the crystal are separated into those resulting from test LED pulses and actual gamma ray induced scintillations. The LED induced signals may be used for camera calibration while the camera is in image collecting mode. Image clarity may also be improved by correcting roughly calculated positions as a function of the roughly calculated positions, and by eliminating events which do not exactly correspond to nuclear decay emissions as a function of the events' positions.