Real-time radioactive source localization with a moving coded-aperture detector system at low count rates

We present a feasibility study of real-time radioactive source localization in which the effects of low count rates on source localizations with a moving coded-aperture detector system are addressed. The conventional crosscorrelation method with the installed binary mask was not reliable enough to filter out background noise at low count rates in this study. To improve the cross-correlation performance, we adopted a new binary mask design method for future work. Offline data processing to mimic on-line data processing was based on multi-CPUs and multi-GPUs (graphics processing units) parallel processing. We also show an iterative list-mode localization method using background-free simulated data.