PET DAQ system for compressed sensing detector modules

We developed a data acquisition (DAQ) system for positron emission tomography (PET) that can efficiently process detector module signals with compressed sensing multiplexing schemes. This multiplexing scheme has a multiplexing ratio of 8:1 and the capability to resolve multi-hit events or light sharing events even at very high singles rates. To process the compressed signals, a conventional DAQ system structure had to be modified. It needs to process 16 ADC channels simultaneously and process large coincidence packets efficiently. We design simultaneous 32 channel ADC sampling scheme to process 16 channel simultaneously at the FPGA. The "asymmetric coincidence processing" was used for coincidence identification which reduced the required network speed. The measured maximum singles events rate was 3.6 Mevent/s per compressed sensing processor which will be 74.7 Mevent/s for all the system. Identified coincidences could be downloaded to a data acquisition PC at 1.2 Mevent/s at maximum. Other free-running analog-to-digital converter (A DC) based systems can also benefit from the proposed asymmetric processing scheme to increase system throughput. Index TermsPositron emission tomography (PET), data acquisition system (DAQ), compressed sensing, coincidence event processing, asymmetric coincidence processing.