Plastic scintillators, verified in J-PET scanner, together with Silicon Photomultipliers (SiPm) open new possibilities in the construction of PET scanners. One of them is a lightweight and modular scanner, that can be easily decomposed, transported and reconstructed in various shapes and sizes.
Photo 1. Schamatic view at the barrel composed out of D-JPET modules
The name D-JPET comes from Digital J-PET. The usage of SiPM completely changes the way we register signals with the scanner. They are small and compact, attached directly to the scintillators. There is no need for high voltage of 1.5 kV, they need about 50 V.
Each module has an integrated readout board with analog signal processing reduced to minimum. The signals enter directly the FPGA, which discriminates and measures time.
Data, already in a form of network packets is then sent to powerful VCU108 Virtex Ultrascale platforms, which concentrate data fragments from multiple streams and perform module-wise high-level analysis.
Last stage is a Zynq Ultrascale+ MPSoC with collects data from the data concentrators and performs image reconstruction.
Photo 2. Single D-JPET module with integrated readout electronics and power supply