Patent ID: 7211800
Filing Date: 2007-05-01
Classification: A61B,G01T

Abstract:
1. A method for correcting an Esum output signal of a nuclear medical imaging apparatus, comprising the steps of: storing a sample series of said Esum output signal obtained at a first sampling rate; detecting a scintillation event using a sample of said Esum output signal obtained at a second sampling rate; determining a minimum value of said Esum output signal from said stored sample series upon detection of a scintillation event; using said determined minimum value to obtain a first DC shift correction value; mathematically operating on said first DC shift correction value with a second DC shift correction value obtained by calibrating a scintillation detector of said nuclear medical imaging apparatus using two radiation sources of differing count rates, to obtain a third DC shift correction value; and correcting said Esum output signal for DC offset by using said third DC is shift correction value.