Simulation study of a pinhole SPECT system with a triple head gamma camera

The purpose of our research is to develop a new pinhole SPECT system using a triple head gamma camera system. The proposed data acquisition geometry used multi-pinhole collimators attached to each gamma camera. Acquired data were reconstructed with the OS-EM method. We evaluated the feasibility of the system with simulations. In the simulations, we evaluated three types of the pinhole collimators with the numbers of pinholes; 5, 8 and 11. And we used a brain phantom and myocardial phantom. Attenuation correction was conducted with the x-ray CT image of the corresponding slice. The results of the simulations confirmed the feasibility of our proposed multi-pinhole SPECT system with more than eight pinholes for each detector.