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

Volume

3

fYear

2002

fDate

10-16 Nov. 2002

Firstpage

1806

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2002 IEEE

Print_ISBN

0-7803-7636-6

Type

conf

DOI

10.1109/NSSMIC.2002.1239673

Filename

1239673