Title :
Optimizing pinhole and parallel hole collimation for scintimammography with compact pixellated detectors
Author :
Smith, Mark F. ; Kieper, Douglas A. ; Majewski, Stan ; Weisenberger, Andrew G. ; Welch, Benjamin
Author_Institution :
Thomas Jefferson Nat. Accelerator Facility, Newport News, VA, USA
Abstract :
The relative advantages of pinhole and parallel hole collimators for scintimammography with compact, pixellated gamma detectors were investigated using analytic models of resolution and sensitivity. Collimator design was studied as follows. A desired object resolution was specified for a pixellated detector with a given crystal size and intrinsic spatial resolution and for a given object-to-collimator distance. Using analytic formulas, pinhole and parallel hole collimator parameters were calculated that satisfy this object resolution with optimal geometric sensitivity. Analyses were performed for 15 cm × 20 cm field of view detectors with crystal elements 1.0, 2.0 and 3.0 mm on a side and 140 keV incident photons.
Keywords :
collimators; gamma-ray applications; gamma-ray detection; image reconstruction; mammography; medical image processing; optimisation; position sensitive particle detectors; solid scintillation detectors; 1 mm; 140 keV; 15 cm; 2 mm; 20 cm; 3 mm; compact pixellated detectors; gamma detectors; optimal geometric sensitivity; optimization; parallel hole collimation; pinhole collimation; scintimammography; Breast; Collimators; Detectors; Head; High-resolution imaging; Image reconstruction; Image resolution; Object detection; Photonic crystals; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2002 IEEE
Print_ISBN :
0-7803-7636-6
DOI :
10.1109/NSSMIC.2002.1239673
