Speaker
Description
Time of flight positron emission tomography (TOF-PET) is a 3D medical imaging technique, used to measure biological activity down to a sensitivity of a picoMol. PET detectors typically consist of a scintillating crystal, photodetector and readout electronics. The time-of-light technique I allows one to inject a lower dose to the patients, to reduce computing time, and for better quality images. In recent years Silicon Photo-Multiplier (SiPM) became the reference photodetector for TOF-PET instrumentation and is widely used in High energy physics, spectroscopy, and LIDAR, due to its excellent time resolution and ease of use.
The ClearMind project develops TOF-PET detectors consisting of PbWO4 crystal with direct deposition of a photocathode and MCP electron multiplication on one side . In this work we develop an additional detection layer using SiPM matrix to use on the other side of the crystal in order to improve gamma depth of interaction estimation and timing resolution.
We present results of the characterization of different SiPM technologies available on the market. The analysis quantifies pulse shapes, noise level (DCR, DiCT, DeCT) , and their dependencies versus overvoltage. We also measured SiPMs time resolution. This analysis allowed us to make informed decisions regarding the choice of SiPM technologies, and optimal operations settings.
High frequency front-end electronics allows to leverage the entire spectral range of SiPMs for best timing resolution. The current trend is the use of high frequency Baluns and amplifiers. HF electronics simulation using ANSYS-HFSS has been conducted to better understand the influence of each component, to choose Baluns and amplifiers, and to design optimized front end electronics in order to push time resolution boundaries. We will present our last results.
| Collaboration | ClearMind |
|---|---|
| Role of Submitter | I am the presenter |
