A MONTE-CARLO INVESTIGATION OF THE DUAL PHOTOPEAK WINDOW SCATTER CORRECTION METHOD

Results from a Monte Carlo investigation of the dual photopeak window (DPW) scatter correction method are presented for point and extended s ources of Tc-99m in both homogeneous and nonhomogeneous attenuating me dia. The DPW method uses the ratio of counts in two nonoverlapping ene rgy windows within the photopeak region as input to a regression relat ion. A pixel-by-pixel estimate of the scatter in the summed windows is obtained and subtracted to yield an estimate of the primary. An appro ximate ten-fold decrease in the scatter fraction and an excellent agre ement with the shape of the true scatter distribution was observed