Title :
Evaluation of the FlexToT ASIC on the readout of SiPM matrices and scintillators for PET
Author :
Castilla, Javier ; Cela, Jose-Manuel ; Comerma, Albert ; Fernandez-Varea, Jose-Manuel ; Freixas, Lluis ; Garrido, L. ; Gascon, David ; Marin, J. ; Martinez, Gina ; Perez, Jose-Manuel ; Rato-Mendes, Pedro ; Sarasola, Iciar
Author_Institution :
CIEMAT, Madrid, Spain
fDate :
Oct. 27 2013-Nov. 2 2013
Abstract :
We have designed FlexToT, a flexible application specific integrated circuit (ASIC) using time-over-threshold (ToT) techniques for the readout of silicon photomultiplier (SiPM) arrays in positron emission tomography (PET) detectors. The FlexToT ASIC accommodates 16 independent channels in a small die size (2.93 mm by 2.54 mm) with low power consumption (10 mW per channel), providing output signals whose duration is proportional to the current amplitude at its inputs. The threshold, gain and other parameters can be independently set for each channel in a flexible configuration that can be tailored to different applications and devices. Herein we present the results on the evaluation of the FlexToT ASIC operating as front-end electronics for SiPM arrays S11828-3344M from Hamamatsu (Japan) coupled to LYSO:Ce scintillators in a simple PET tomograph demonstrator. Each detector block is composed of a LYSO:Ce matrix coupled to 4 SiPM arrays in a 2×2 mosaic, totaling 64 pixels (8×8) which are read out by 4 FlexToT ASICs. Using this demonstrator we have obtained PET images of 22Na point sources with spatial resolutions better than 2 mm full width at half maximum (FWHM), validating our design of the FlexToT ASIC on the readout of SiPM matrices and scintillators in PET applications.
Keywords :
application specific integrated circuits; biomedical electronics; elemental semiconductors; image resolution; medical image processing; photomultipliers; positron emission tomography; scintillation counters; silicon; 22Na point sources; FlexToT ASIC; LYSO:Ce scintillators; PET; Si; SiPM arrays S11828-3344M; SiPM readout matrices; detector block; flexible application specific integrated circuit; flexible configuration; front-end electronics; full width-at-half maximum; independent channels; positron emission tomography detectors; power consumption; silicon photomultiplier arrays; simple PET tomograph demonstrator; small die size; spatial resolutions; time-over-threshold techniques; Application specific integrated circuits; Detectors; Field programmable gate arrays; Image reconstruction; Positron emission tomography; Spatial resolution; Universal Serial Bus;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2013 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4799-0533-1
DOI :
10.1109/NSSMIC.2013.6829206