Title :
The influence of phantom size, shape, and density, and collimator selection on the dual photopeak window scatter correction method
Author :
Hademenos, George J. ; King, Michael A. ; Ljungberg, Michael
Author_Institution :
Dept. of Nucl. Med., Massachusetts Univ., Medical Center, Worcester, MA, USA
Abstract :
Results from a Monte Carlo investigation are presented for the application of the dual photopeak window (DPW) scatter correction method to phantom geometries of varying shapes, sizes, and densities, as well as to several collimators. A Monte Carlo program was used to simulate a Tc-99m point source at locations of 0.5 cm from the phantom surface, at the center, 0.5 cm from the bottom, and 4/5 the distance lateral from the center for each case of variation. DPW was then used to correct for scatter using a regression relation determined for a 30.5 cm×23.0 cm water-filled elliptical tub phantom using an ultrahigh-resolution collimator. The application of DPW in all cases accounted for an approximate twelve-fold reduction in scatter fraction
Keywords :
Monte Carlo methods; computerised tomography; radioisotope scanning and imaging; DPW; Monte Carlo program; Tc-99m point source; collimator selection; dual photopeak window scatter correction method; phantom density; phantom geometries; phantom shape; phantom size; regression relation; scatter fraction; ultrahigh-resolution collimator; water-filled elliptical tub phantom; Biomedical imaging; Cancer; Collimators; Electromagnetic scattering; Energy resolution; Imaging phantoms; Monte Carlo methods; Nuclear medicine; Particle scattering; Shape;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301449
