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There is currently a great interest in ultra-high spatial resolution PET modules to be used for preclinical imaging and special PET applications for humans, such as cardiac and brain imaging. A high spatial resolution can be obtained by reducing the pixel size in pixelated scintillators, which, in turns, requires a finer segmentation of the SiPM array that reads out the crystal and a higher number of channels of the readout electronics.
For keeping the complexity of the readout electronics low, different position sensitive SiPMs (PS-SiPM) architectures have been recently proposed. We are actively working on this topic, in collaboration with our partners, and we have taken part in the development of the two most-recent PS-SiPM architectures. Both of them exploit the intrinsic granlarity of the SiPM structure to implement the position encoding through a light sharing approach.
In collaboration with the University of Aachen, we have designed and fabricated the first prototypes of 1D and 2D Sensitivity Encoded Silicon Photomultiplier (SeSP), whereas we have produced the 2D Interpolating SiPM in collaboration with the University of Heidelberg.
We have also designed our own variant of PS-SiPM, called Linearly-graded SiPM (LG-SiPM), based on a different, charge sharing approach, which has been fabricated and it is currently under experimental validation. The obtained results will be presented at the NSS/MIC 2013 conference.
P. Fischer and C. Piemonte, "Interpolating silicon photomultipliers", Nuclear Instruments and Methods in Physics Research - A, Vol. 718, 2013, Pp. 320-322.