An investigation of shaper circuit optimization for digitally pulse processing in PET

All digital Positron Emission Tomography (PET) has such potential advantages as quick and efficient calibration, achieving the ideal timing resolution for time of flight (TOF) PET imaging and specific application aiming at requirements. To improve the pulse processing in digital PET, we continue the pulse shaping method which decreases the speed of Analog to Digital Converter (ADC) sampling and facilitates the engineering operation. By employing a DSP method we can reconstruct the shaped pulse from ADC samples. For the RC-CR-RCn Gaussian shaper architecture, we evaluate and compare the performance of these shapers with different RC architectures. In this study, we focus on the energy resolution and timing resolution. According to the results, the energy resolutions keep around ∼14% while the optimal result of timing resolution for reconstructed pulse is 385ps, and that for shaped pulse is 344ps, with the single RC as shaper. We will extend our work for the shaper circuit modifications and further applications with efficient timing pick up method as well.