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Development of high-resolution detector module with depth of interaction identification for positron emission tomography

2016; Elsevier BV; Volume: 845; Linguagem: Inglês

10.1016/j.nima.2016.04.080

1872-9576

T. Niknejad, M. Pizzichemi, Gianluca Stringhini, E. Auffray, R. Bugalho, José Carlos da Silva, A. Di Francesco, L. Ferramacho, P. Lecoq, Carlos Leong, M. Paganoni, M. Rolo, Rui Silva, Miguel Silveira, S. Tavernier, J. Varela, Carlos Zorraquino,

Atomic and Subatomic Physics Research

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 1.53×1.53×15 mm3 matrix of 8×8 LYSO scintillator with lateral surfaces optically depolished separated by reflective foils. The crystal array is optically coupled to 4×4 silicon photomultipliers (SiPM) array and readout by a high performance front-end ASIC with TDC capability (50 ps time binning). The results show an excellent crystal identification for all the scintillators in the matrix, a timing resolution of 530 ps, an average DOI resolution of 5.17 mm FWHM and an average energy resolution of 18.29% FWHM.