Title :
Investigation of full-field CZT detector for emission mammotomography
Author :
Archer, Caryl N. ; Tornai, Martin P.
Author_Institution :
Dept. of Biomed. Eng., Duke Univ., Durham, NC, USA
Abstract :
The purpose of this work is to investigate and characterize a 16×20 cm2 detector using quantized cadmium-zinc-telluride (CZT), which has been recently incorporated into the application specific emission tomograph (ASET) system for dedicated emission mammotomography. The LumaGEM 3200-S consists of 5120 total segmented pixels on 2.5 mm center-to-center pitch. The mean intrinsic energy resolution has been measured at 9.9% FWHM at 140 keV. The camera is mounted on the hemispherical gantry system for dedicated, uncompressed breast imaging, utilizing a high resolution parallel beam collimator. The modified ASET system is evaluated with planar and SPECT measurements of line sources and cold rod phantoms using simple circular tomography. Image quality is investigated through measurements of lesions in a breast background including lesion signal-to-noise ratio and contrast, using both simple vertical axis of rotation orbits and more complicated three-dimensional orbits.
Keywords :
collimators; image reconstruction; mammography; medical signal processing; phantoms; position sensitive particle detectors; semiconductor counters; single photon emission computed tomography; 16 cm; 20 cm; FWHM; LumaGEM 3200-S camera; SPECT measurement; application specific emission tomograph system; breast background; circular tomography; cold rod phantoms; dedicated uncompressed breast imaging; emission mammotomography; full-field CZT detector; hemispherical gantry system; high resolution parallel beam collimator; image quality; image reconstruction; lesion measurement; lesion signal-to-noise ratio; line sources; mean intrinsic energy resolution; modified ASET system; planar measurement; quantized cadmium-zinc-telluride detector; rotation orbits; three-dimensional orbits; total segmented pixels; vertical axis; Breast; Cameras; Detectors; Energy measurement; Energy resolution; Extraterrestrial measurements; High-resolution imaging; Image segmentation; Lesions; Orbits;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2003 IEEE
Print_ISBN :
0-7803-8257-9
DOI :
10.1109/NSSMIC.2003.1352437
