EndoTOFPET-US data acquisition system

The EndoTOFPET-US system is a multi-modal imaging system, combining Time of Flight PET (200 ps time resolution) and Ultra-Sound into an endoscopic probe. The PET component has an asymmetric configuration. The in-probe detector is based on 0.8 x 0.8 x 10 mm(3) LYSO crystal fibers, read by a Geiger mode SIPM with digital output. The other detector is a 200 x 200 mm external plate, based on 3 x 3 x 15 mm(3) LYSO crystals, coupled to discrete 3 x 3 SiPMs read by a 64 channel ASIC. A compact data acquisition system based on digital reconfigurable electronics is proposed. FGPAs on the front end concentrate event data and transmit it to an external trigger. The probe electronics also transmit event data to the trigger. The trigger is a single PCIe card which sits directly in the acquisition computer. A preliminary event selection is performed directly in the trigger FPGA, while more sophisticated event processing is handle by software. The system is capable of handling rates up to 40 MHz from the external plate and 200 kHz from the probe.