Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5498199 | Physica Medica | 2017 | 9 Pages |
Abstract
We present the performance evaluation of a large-area detector module based on the ArrayC-60035-64P, an 8 Ã 8 array of tileable, 7.2 mm pitch, silicon photomultipliers (SiPM) by SensL, covering a total area of 57.4 mm Ã 57.4 mm. We characterized the ArrayC-60035-64P, operating at room temperature, using LYSO pixelated crystal arrays of different pitch sizes (1.075, 1.430, 1.683, 2.080 and 2.280 mm) to determine the resolvable crystal size. After an optimization process, a 7 mm thick coupling light guide was used for all crystal pitches. To identify the interaction position a 16-channel (8 columns, 8 rows) symmetric charge division (SCD) readout board together with a center-of-gravity algorithm was used. Based on this, we assembled the detector modules using a 40 Ã 40 LYSO, 1.43 mm pitch array, covering the total detector area. Calibration was performed using a 137Cs source resulting in excellent crystal maps with minor geometric distortion, a mean 4.1 peak-to-valley ratio and 9.6% mean energy resolution for 662 keV photons in the central region. The resolvability index was calculated in the x and y directions with values under 0.42 in all cases. We show that these large area SiPM arrays, combined with a 16-channel SCD readout board, can offer high spatial resolution, without processing a big number of signals, attaining excellent energy resolution and detector uniformity.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
E. Calva-Coraza, H. Alva-Sánchez, T. Murrieta-RodrÃguez, A. MartÃnez-Dávalos, M. RodrÃguez-Villafuerte,