OpenPET is our original idea to realize an open-type 3D PET scanner for PET-image guided particle therapy such as in situ dose verification and direct tumor tracking. The principal of dose verification for particle therapy is based on the measurement of positron emitters which are produced through fragmentation reactions caused by proton or carbon ion irradiation. Even with a full-ring geometry, the OpenPET has an open gap through which the treatment beam passes, while conventional positron cameras applied to particle therapy imaging have been basically limited to planner imaging. The key technology which has enabled OpenPET is our original, 4-layered DOI detector. In this presentation, we propose the use of positron emitter beams for direct visualization of the beam stopping position. In addition to a C-11 beam, an O-15 beam has been also demonstrated.Medinet Network Meetin
