Sep 12 – 17, 2021
University of Birmingham
Europe/London timezone

Detection module based on position-sensitive large-area Silicon photomultipliers

Sep 16, 2021, 10:35 AM
Teaching and Learning Building (University of Birmingham)

Teaching and Learning Building

University of Birmingham

Edgbaston Campus University of Birmingham B15 2TT UK
poster Medical Applications of Position Sensitive Detectors Poster Session 5 (Gas-based Detectors; Medical Applications of Position Sensitive Detectors)


Dr Fabio Acerbi (Fondazione Bruno Kessler (FBK))


Silicon Photomultipliers are compact single-photon-sensitive detectors, widely used in many applications. In FBK (Trento, Italy) we developed large area SiPMs (up to 10x10$mm^2$), based on different technologies and we are also focusing on the position-sensitive SiPM (PS-SiPM) technology based on charge-sharing approach. These are based on the so called “linearly-graded, LG” technology, exploiting a weighted current dividers on vertical and horizontal axis, to obtain signals (left, right, top and bottom signals) with amplitude and charge proportional to the light-absorption position.
Such large area detector with position sensitivity is very interesting in applications like ultra-high spatial resolution, MR-compatible PET and in the creation of a compact gamma and beta cameras with a reduced number of channels, for radio-guided surgery or other clinical decision support tool for diagnostic imaging.
In this contribution, we illustrate the project developed in collaboration with the University of Geneva for a detection module based on a 2×2 tile of large-area PS-SiPMs, including front-end amplifiers and shaped like a “handable” probe. Total area is 1.6x1.6 $cm^2$. The PS-SiPMs are connected in a smart configuration, maintaining a very low number of channels. Indeed, while for a single LG-SiPM there are 4 output, for a 2×2 tile, we have just 6 outputs. The measured position resolution (measured with a pulsed LED, scanned over active area) is better than 0.5 mm.
Finally, we performed an estimation of the performance of such module when used as a gamma camera for tumor detection. With OpenGate simulation, we proved that for a radio-tracer emitting gamma of lower energy, as 99mTc, the gamma camera could achieve an excellent performance. Superficial tumors, of about 2 mm, could be well reconstructed in less than 20 seconds. Tumors bigger than 6 mm in radius could be detected at 30 mm deep within about 10 seconds.

Your name Fabio Acerbi
Institute FBK
Title Dr

Primary authors

Dr Fabio Acerbi (Fondazione Bruno Kessler (FBK)) Andrii Nagai (Universite de Geneve (CH)) Dr Stefano Merzi (FBK) Ana Ventura Barroso (Universite de Geneve (CH)) Domenico Della Volpe (Universitè de Genève) Dr Alberto Gola (Fondazione Bruno Kessler)

Presentation materials