Abstract
An optical electrical model which studies the response of Si-based single photon counting arrays, specifically silicon photomultipliers (SiPMs), to scintillation light has been developed and validated with analytically derived and experimental data. The scintillator-photodetector response in terms of relative pulse height, 10%-90% rise/decay times to light stimuli of different rise times (ranging from 0.1 to 5 ns) and decay times (ranging from 1 to 50 ns), as well as for different decay times of the photodetector are compared in theory and simulation. A measured detector response is used as a reference to further validate the model and the results show a mean deviation of simulated over measured values of 1%.
Highlights
In most modern imaging techniques the outcome is the result of an acquisition chain which eventually is reduced to the manipulation of electrical signals
Cquench · Cdiode Cquench + Cdiode τph,decay,2 ∼ Rquench · (Cquench + Cdiode) where Rquench and Cquench are the passive elements of the quenching circuitry, Cdiode is the individual microcell capacitance, contribute to a parasitic capacitance (Ctrace) is the readout trace parasitic capacitance and resistive load of variable value (Rload) is the load impedance at which the silicon photomultipliers (SiPMs) is connected for readout
0.1 τph,decay 25 lected under the assumption that they represent a good approximation to the values quoted in literature for lutetium oxyorthosilicate (LSO) crystals [24], which are widely used in positron emission tomography (PET), and SiPM photodetectors [25]
Summary
In most modern imaging techniques the outcome is the result of an acquisition chain which eventually is reduced to the manipulation of electrical signals. The response of single photon counting arrays to incoherent light has not been extensively studied, yet a general understanding of the different factors that contribute to signal formation is highly desired. This holds true especially in the case of PET, that seeks to detect pairs of simultaneously emitted annihilation quanta based on the generated signals upon their absorption to two scintillation detector elements located on opposite sides of the patient. The findings will be useful in the imaging field in order to guide the design of future scintillation detectors for PET as well as other biomedical applications
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