G. Dissertori and F. Pauss
Active R&D project
Recent years have seen a significant progress in PET (Positron Emission Tomography) instrumentation, boosted by the migration of technologies originally developed for high energy physics experiments into prototype PET devices.
The AX-PET (Axial PET) project is an excellent example in this direction, showing how calorimetry knowledge could be applied for high resolution PET detectors. AX-PET started in 2007 with the goal of constructing a demonstrator for a PET scanner based on the unconventional axial geometry. It uses modules of axially-oriented long LYSO crystals, interleaved by arrays of WLS strips, all read out by Geiger-mode avalanche photodiodes (G-APD). This novel configuration allows a 3-dimensional reconstruction of the gamma interaction point as well as full identification of Compton interactions in the crystals, that can be included in image reconstruction, thus enhancing the sensitivity.