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1、 The architecture of the small animal PET system is shown in Fig.1,which consists of detector modules,Front Amplifier Boards(FABs),Singles Processing Units(SPUs),Coincidence Processing Units(CPUs),Silicon Photomultipliers(SiPM)Supply Board(SSB),Clock and Synchronize Board(CSB),Power Supplier(PS)and
2、PC.The detector modules absorb the photons and generate electrons signals.Then the signals are amplified by the FAB,and transmitted to the SPU.In the SPU,through the time and charge measurement of the input analog signals,it can calculate the position and energy information and transmit the digital
3、signals to the CPU.Then the CPU module coincides all the digital signals and send the results to PC.Fig.1 The architecture of the small animal PET system.In this work,the SPU,which is a 32 channels high-resolution time and charge measurement module,is design.And we conducted a series of tests to eva
4、luate the performance of the SPU.Material,Technology,MethodsInitial Testing of Singles Processing Unit for the Small Animal PETDeng PeiPei1,Zhao Lei1,Lu Jiaming1,Dong Ruoshi1,Gu Jinliang1,Li Bowen1,Liu Shubin1,An Qi1(1.State Key Laboratory of Particle Detection and Electronics,University of Science
5、and Technology of China,Jinzhai Road,Hefei,230026,China)The SPU is responsible for receiving the input signal from the FAB,measuring the time,energy and location information,and packaging and sending the results to the CPU for further processing.Fig.2 Architecture of the SPU module.Charge measuremen
6、t:processed by a shaping circuit,and digitized by an Analog-to-Digital Converter(ADC),then calculated the area of the sampling signals in Field Programmable Gate Array(FPGA).Time measurement:the signals summed by an amplifier and fed to a discriminator.ObjectivesResults and Discussion(a).one channel (b)32 channelsFig.3 the charge measurement results(a).one time delay (b)change time delayFig.4 the time precision resultsContact me:University of Science and Technology of China，Hefei China,13637072883,230026.