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We present the design and experimental characterization of SITH, a custom-designed 16-channel ASIC for the readout of arrays of silicon photomultipliers (SiPMs) coupled to pixelated scintillators. This integrated circuit measures both the energy and time-of-arrival of the detected gamma photons and it is tailored for the specific application of prompt gamma imaging (PGI) for particle range verification in hadrontherapy treatments. The SITH ASIC features a low input impedance (2 SiPMs coupled with 3×3×5mm 3 LYSO scintillators is close to 200 ps FWHM. The reported experimental measurements were conducted with a 16-channel prototype of a prompt gamma-ray detection module, which provides a real-time measurement of the gamma-ray hit position, energy and time-of-arrival through 16 time-to-digital converters (TDCs) implemented in FPGA. The maximum count-rate per channel is approximately 3 Mcps.
D’Adda et al. (Tue,) studied this question.
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