Time of flight measurements based on FPGA and SiPMs for PET-MR

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• 作者：Albert Aguilar ; Raimundo Garc铆a-Olcina ; Pedro A. Mart铆nez ; Julio Martos ; Jes煤s Soret ; Jos茅 Torres ; Jos茅 M. Benlloch ; Antonio J. Gonz谩lez ; Filomeno S谩nchez
• 关键词：Time of flight ; Silicon photomultipliers ; Time-to-digital converter ; Field programable gate array ; Positron emission tomography and magnetic resonance
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：11 January, 2014
• 年：2014
• 卷：734
• 期：part_PB
• 页码：127-131
• 全文大小：1043 K

文摘

Coincidence time measurements with SiPMs have shown to be suitable for PET/MR systems. The present study is based on 3脳3 mm² SiPMs, LSO crystals and a conditioning signal electronic circuit. A Constant Fraction Discriminator (CFD) is used to digitalize the signals and a TDC FPGA-implemented is employed for fine time measurements. TDC capability allows processing the arrival of multiple events simultaneously, measuring times under 100 ps. The complete set-up for time measurements results on a resolution of 892卤41 ps for a pair of detectors. The details of such implementation are exposed and the trade-offs of each configuration are discussed.