Design and simulation of an intraoperative Positron Probe based on Silicon Photomultipliers

layers of plastic scintillator separated by a light guide and read-out by a single SiPM array. Events originating from the top and the bottom layers are discriminated from the analysis of the light distribution on the photosensor. We first showed that a subtraction method can perform very good rejection up to 98% of the background gamma noise with a weak sensitivity to its distribution when the gap between the two scintillators is smaller than 4 mm. We also demonstrated that both configurations of the positron imaging probe can offer sub-millimetric resolutions and very small bias.