ROCSTAR: Data acquisition electronics for TOF PET

Readout electronics are being developed to instrument a high resolution, time-of-flight PET scanner, targeted for breast imaging. The electronics and system design is a modular one, allowing the electronics to be used in many different system geometries. The electronics has been optimized for the H8500 PMT but it could be used to instrument a wide range of other rectangular photosensor arrays. The design of the electronics was presented, along with the results of simulations which were used to determine a set of electronics specifications. The simulations provided valuable guidance in setting out the design of the board. In particular the simulations indicated the need for channel-by-channel DRS4 calibration (to reduce sample jitter) as well as having two DRS4 chips in parallel (to reduce dead-time). The simulations also guided our choice of pulse shaping for the anode/positioning portion of the circuit. Prototype results show that the design falls well within the specifications that we had established.