Title :
Theoretical performance comparison of a Compton-scatter aperture and parallel-hole collimator
Author :
Clinthorne, Neal H. ; Ng, Chor-yi ; Hua, Chia-ho ; Gormley, Jerome E. ; LeBlanc, James W. ; Wilderman, Scott J. ; Rogers, W. Leslie
Author_Institution :
Div. of Nucl. Med., Michigan Univ., Ann Arbor, MI, USA
Abstract :
Using the Uniform Cramer-Rao bound on variance, the performance of a conventional parallel-hole collimator has been compared with that of a ring-geometry Compton-scatter aperture. Objects used for the evaluation were uniformly emitting disk sources with diameters ranging from about 4-30 cm. Results for a 7.5 cm diameter disk and 141 keV incident energy show that a Compton-scatter aperture, constructed with Si detectors having 230 eV FWHM energy resolution, can be 15 times more efficient than a standard parallel-hole collimator at the same operating point
Keywords :
Compton effect; silicon radiation detectors; 141 keV; 230 eV; 230 eV FWHM energy resolution; 4 to 30 cm; 7.5 cm; Compton-scatter aperture; Si detectors; Uniform Cramer-Rao bound; operating point; parallel-hole collimator; ring-geometry Compton-scatter aperture; standard parallel-hole collimator; uniformly emitting disk sources; variance; Apertures; Biomedical engineering; Chromium; Collimators; Covariance matrix; Delta-sigma modulation; Detectors; Image reconstruction; Nuclear medicine; Scattering;
Conference_Titel :
Nuclear Science Symposium, 1996. Conference Record., 1996 IEEE
Print_ISBN :
0-7803-3534-1
DOI :
10.1109/NSSMIC.1996.591443
