Simultaneous attenuation and scatter correction by restoration in PET imaging

The aim in this work is to correct for attenuation and scatter in PET by analytically assessing the distribution of the scattered photons using the emission and the transmission images, the probability of scatter interactions and the detection efficiency. At an energy threshold above 300 keV, the attenuated photons are exactly those have been scattered. These are removed from the coincidence detection and restored to the coincidences corresponding to the scattering angle /spl theta/=0. We applied this new method for data obtained with a small animal PET scanner but the method is equivalent for a whole body scanner.