Fig. 5From: NEMA NU 1-2018 performance characterization and Monte Carlo model validation of the Cubresa Spark SiPM-based preclinical SPECT scannerMeasured and simulated \(^{99\text {m}}\)Tc energy spectra acquired at a count rate loss below 20%. The intrinsic resolution was 14.7% in both cases. Differences can be observed in the pile-up energy distribution due to partial scintillation light collection of the SiPM array, which was not modelled with GATEBack to article page