Experimental studies of the performance of different methods in the inter-crystal Compton scatter correction on one-to-one coupled PET detectors

The purpose of the study is to assess the performance of different methods in correcting the inter-crystal Compton scatters in one-to-one coupled PET detectors. A experimental system was constructed with 10 × 10 LYSO crystal arrays, 10 × 10 SiPM arrays and read-out circuits. The SiPMs were one-to-one air-coupled with the crystals, and then connected to the read-out circuit though the cable. Two detector modules were placed face to face. When a coincidence events were detected, the energy signals from all 200 SiPMs (two detectors) were read and sent to the host PC for data analysis off-line. Signals from one of the two detectors were used as references for electronic collimation. Four different practical methods to decode the crystal ID were implemented on the second detector. We compared the performance of different methods by calculating and comparing the MAE error of their energy distribution. In the end, we drew a conclusion to support our further work.