We have developed a Time-of-flight high resolution and commercially viable detector module for the application in small PET scanners. A new approach to depth of interaction (DOI) encoding with low complexity for a pixelated crystal array using a single side readout and 4-to-1 coupling between scintillators and photodetectors was investigated. In this method the DOI information is estimated using the light sharing technique. The detector module is a 1.53Ã—1.53Ã—15mm3 matrix of 8Ã—8 LYSO scintillator with lateral surfaces optically depolished separated by reflective foils. The crystal array is optically coupled to 4Ã—4 silicon photomultipliers (SiPM) array and readout by a high performance front-end ASIC with TDC capability (50ps time binning). The results show an excellent crystal identification for all the scintillators in the matrix, a timing resolution of 530ps, an average DOI resolution of 5.17mm FWHM and an average energy resolution of 18.29% FWHM.
Proceedings of the Vienna Conference on Instrumentation 2016
- Positron emission tomography, Positron emission mammography, Small animal PET, Depth of interaction, Time of flight