This paper investigates optimum slat collimator design parameters for dual-head coincidence imaging (DHCI) systems. Noise equivalent count (NEC) rate was examined with respect to the activity concentration under various system conditions. All results are derived from Monte Carlo simulations with a digital anthropomorphic (Zubal) phantom. The DHCI system was modeled after the Millennium VG gamma camera (GEMS, Waukesha, WI). The dead-time characteristics of the camera were experimentally determined. Our results suggests that substantial NEC gains can be achieved by varying the slat-to-slat separation, such that the peak of the NEC curve is located at clinically relevant levels (i.e., 0.07 0.10 Ci/cc). The NEC was also found to increase with the use of longer slats with appropriately selected slat-to-slat separation. Furthermore, the NEC performance also depends on the count-rate performance (i.e., dead-time losses) of the system. Therefore, as improvements are made to the count-rate capabilities of DHCI systems, the slat geometry should be modified. Further study is required to determine the effect that slat collimator design has on image quality and lesion detection for clinically realistic imaging situations. Index Terms-Dual-head coincidence imaging (DHCI), noise equivalent count (NEC), salt collimator. ).Publisher Item Identifier S 0018-9499(02)01653-2.
This work investigates optimum slat collimator design parameters for dual head coincidence imaging systems. Noise equivalent count rate was examined with respect to the activity concentration under various system conditions.All results are derived from Monte Carlo simulations with a digital anthropomorphic phantom. The DHCI system was modeled after the Millennium VG gamma camera (GEMS. Waukesha, Wisconsin). The dead-time characteristics of the camera were experimentally determined.Our results suggests that substantial NEC gains can be achieved by varying the slat to slat separation, such that the peak of the NEC curve is located at clinically relevant levels (i.e., 0.07-0.10 pcikc). The NEC was also found to increase by using longer slats with appropriately selected slat to slat separation. Furthermore, the NEC performance also depends on the count rate performance (i.e., deadtime losses) of the system. Therefore as improvements are made to the count rate capabilities of DHCI systems, the slat geometry should be modified.Further study is required to determine the effect slat collimator design has on image quality and lesion detection for clinically realistic imaging situations.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.