The ClearPET™ project:: development of a 2nd generation high-performance small animal PET scanner

Second generation high-performance PET scanners, called ClearPET(TM)(1), have been developed by working groups of the Crystal Clear Collaboration (CCC). High sensitivity and hi.-h spatial resolution for the ClearPET camera is achieved by using a phoswich arrangement combining two different types of lutetium-based scintillator materials: LSO from CTI and LuYAP:Ce from the CCC (ISTC project). In a first ClearPET prototype, phoswich arrangements of 8 x 8 crystals of 2 x 2 x 10 mm(3) are coupled to multi-channel photomultiplier tubes (Hamamatsu R7600). A unit of four PMTs arranged in-line represents one of 20 sectors of the ring design. The opening diameter of the ring is 120 mm, the axial detector length is 110 mm. The PMT pulses are digitized by free-running ADCs and digital data processing determines the gamma energy, the phoswich layer and even the exact pulse starting time. which is subsequently used for coincidence detection. The gantry allows rotation of the detector modules around the field of view.