Dynamic cardiac SPECT imaging using a stationary SPECT camera

The current SPECT scanning paradigm involves slow rotation of multiple detectors around the patient, and is not well adapted to performing multiple collections of tomographically complete data over short time intervals. In order to rotate the detectors fast around the patient, the detectors of the current SPECT scanner are made to rotate in a circular path resulting increase in the distance of detectors from the patient and a decrease in spatial resolution. We are investigating a novel SPECT camera with the capability to collect full tomographic data every 2 seconds. The proposed camera uses three stationary detectors mounted with slant-hole collimators that rotate at about 30 rpm. Because the detectors are stationary, they can be placed much closer to the patient for improved spatial resolution. With Monte Carlo simulations and list-mode reconstructions, we compared the performance of conventional 3-headed SPECT with the proposed stationary SPECT system to estimate the kinetic parameters of two-compartmental model of myocardial perfusion. The study separated the effects of fast temporal scanning speed and better spatial resolution of DyRoSH scanner in estimating the kinetic parameters of myocardial perfusion accurately. The proposed system showed better accuracy in estimating kinetic parameters compared to conventional SPECT scanner.