Development and performance study of single photon emission computed tomography system

Abstract

Single photon emission computed tomography system for the measurement of the distribution of externally administered radionuclides in human body has been developed and its performance is studied. GAMMATOM-II consists of 36 NaI(T$\ell$) scintillation detectors of 2 cm (dia.)$\times$3.8 cm (length). The detectors are arranged into four separate banks each of which consists of nine detectors. Each detector bank is arranged in a circular arc shape and is displaced 1/4 detector width each other from center. Using collimators which have converging multiple holes and new sampling scheme, spatial resolution of 7 mm FWHM was obtained with 15 cm diameter resolution phantom. Sensitivity of the system was observed as counts of 100 (counts/sec)/($\mu$Ci/cc) with 28 cm diameter uniform disk phantom filled with $^{99m}$Tc.