A 8×16 pixel array based on CMOS small area Silicon Photomultipliers (mini-SiPMs) detectors for PET applications is reported. Each pixel is 570 × 610 µm2 in size and contains 4 digital mini-SiPMs, for a total of 720 SPADs, resulting in a full chip fill-factor of 35.7%. For each gamma detection, the pixel provides the total detected energy and a timestamp, obtained through two 7b counters and two 12b 64ps TDCs. An adder tree overlaid on top of the pixel array sums the sensor total counts at up to 100 Msamples/s, which are then used for detecting the asynchronous gamma events on-chip, while also being output in real-time. Characterization of gamma detection performance with an 3×3×5 mm3 LYSO scintillator at 20o C is reported, showing a 511 keV gamma energy resolution of 10.9% and a coincidence timing resolution of 399 ps.
A fully digital 8×16 SiPM array for PET applications with per-pixel TDCs and real-time energy output
Huf Campos Braga, Leo;Gasparini, Leonardo;Massari, Nicola;Perenzoni, Matteo;Stoppa, David;
2014-01-01
Abstract
A 8×16 pixel array based on CMOS small area Silicon Photomultipliers (mini-SiPMs) detectors for PET applications is reported. Each pixel is 570 × 610 µm2 in size and contains 4 digital mini-SiPMs, for a total of 720 SPADs, resulting in a full chip fill-factor of 35.7%. For each gamma detection, the pixel provides the total detected energy and a timestamp, obtained through two 7b counters and two 12b 64ps TDCs. An adder tree overlaid on top of the pixel array sums the sensor total counts at up to 100 Msamples/s, which are then used for detecting the asynchronous gamma events on-chip, while also being output in real-time. Characterization of gamma detection performance with an 3×3×5 mm3 LYSO scintillator at 20o C is reported, showing a 511 keV gamma energy resolution of 10.9% and a coincidence timing resolution of 399 ps.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
