Abstract: Silicon-based photomultipliers (SiPMs) for reducing optical crosstalk effects in the SiPMs are provided. The SiPMs include macrocells. Each macrocell includes microcells, coupled in parallel, and a reading circuit coupled to an output of each macrocell. The microcells are arranged in the SiPM so that adjacent microcells belong to different macrocells. When a microcell performs a detection, the reading circuit of each macrocell having one or more microcells adjacent to the microcell that performed the detection is configured to disable its output signal during a predefined period of time. PET devices or systems and methods for reducing crosstalk effects are also provided.

Abstract: A summation circuit (1) for summing one or more signals received from a photomultiplier array is proposed. The summation circuit comprises one or more readout circuits (5) coupleable to one or more photodiodes of the photomultiplier array (2), respectively, and a channel summing module (50), coupled at one or more outputs of the one or more readout circuits, respectively, to sum the one or more signals provided by the one or more readout circuits. The one or more readout circuits are coupleable to the photodiode of the photomultiplier array. Each readout circuit (5) comprises one or more coefficient controllers (C1, C2) for controlling multiplying coefficients of the received signal. The coefficient controllers may be placed at the input and/or at the output of the readout circuits (5).

Abstract: A summation circuit (1) for summing one or more signals received from a photomultiplier array is proposed. The summation circuit comprises one or more readout circuits (5) coupleable to one or more photodiodes of the photomultiplier array (2), respectively, and a channel summing module (50), coupled at one or more outputs of the one or more readout circuits, respectively, to sum the one or more signals provided by the one or more readout circuits. The one or more readout circuits are coupleable to the photodiode of the photomultiplier array. Each readout circuit (5) comprises one or more coefficient controllers (C1, C2) for controlling multiplying coefficients of the received signal. The coefficient controllers may be placed at the input and/or at the output of the readout circuits (5).