Abstract
We present a 4 × 4 array of digital silicon photomultipliers (D-SiPMs) capable of timestamping up to 48 photons per D-SiPM and we show the advantage of generating multiple timestamps in the context of positron emission tomography (PET). The D-SiPMs have a pitch of 800 μm and comprise 416 pixels each; the timing resolution achieved by the SiPMs is 179 ps FWHM, while each pixel has a fill factor of up to 57 % and a single-photon timing resolution of 114 ps.
Highlights
This article has been downloaded from IOPscience
We present a 4 × 4 array of digital silicon photomultipliers (D-SiPMs) capable of timestamping up to 48 photons per D-SiPM and we show the advantage of generating multiple timestamps in the context of positron emission tomography (PET)
The D-SiPMs have a pitch of 800 μm and comprise 416 pixels each; the timing resolution achieved by the SiPMs is 179 ps FWHM, while each pixel has a fill factor of up to 57 % and a single-photon timing resolution of 114 ps
Summary
For the emitted photons from a LYSO scintillator, we can assume that detection occurs at time, θ. The dark counts follow an exponential probability distribution with event rate, λ , and reset time, tr, as f (t) = λ exp(−λ (t − tr)) when t > tr, otherwise, f (t) = 0. The scintillator-based pdf and the dark count pdf are mixed with mixing ratio α : (1 − α) where α is defined by the percentage of photons emitted from scintillator, N, out of total detectable events,. ∞ tr fd cr (t |t r) dt dr the mixed pdf is used for calculating the Fisher information [13] for the rth-order statistics pdf or the joint pdf for the first r-order statistics, the Cramer-Rao lower bound for the unbiased estimator, θ , is calculated This procedure is shown in figure 2
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