A Monte-Carlo simulation study on coarse septa for scatter correction in 3D PET

This report shows the usefulness of coarse septa in positron emission tomography by Monte-Carlo simulation. It was shown that coarse septa result in higher sensitivity than two-dimensional mode with conventional full-septa and lower scatter fraction than three-dimensional mode without septa. In addition, we propose a new scatter correction method using coarse septa, where scatter components are estimated from coincidence data for those line-of-responses that are intercepted by coarse septa. This scatter correction potentially has an ability to cope with scatter from radioactivity outside the field-of-view