# VCI2022 - The 16th Vienna Conference on Instrumentation

Feb 21 – 25, 2022
Vienna University of Technology
Europe/Vienna timezone

## Optimization of Detector Modules for Measuring Gamma-ray Polarization in Positron Emission Tomography

Not scheduled
20m
Vienna University of Technology

#### Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Recorded Presentation Medical Applications

### Speaker

Dr Siddharth Parashari (Department of Physics, Faculty of Science, University of Zagreb)

### Description

Detection of gamma-ray polarization in Positron Emission Tomography (PET) is yet an unexploited feature that could be used as an additional handle to improve signal-to-background ratio in this imaging modality. The gamma polarization is related to the azimuthal angle in the Compton scattering process, so the initial correlation of polarizations translates to the correlation of azimuthal angles in true coincidence events, while it lacks in the background. We will present a comprehensive experimental study of the polarimetric performance of 5 detector configurations based on scintillator matrices and silicon photomultipliers. The modules consist of either GaGG:Ce or LYSO:Ce pixels with sizes varying from 1.9x1.9x20 mm$^3$ to 3x3x20 mm$^3$. The distinctive feature of the modules is that they can reconstruct the Compton scattering by detecting the recoil electron and the scattered gamma in a single detector layer, which simplifies extension to larger systems. We will discuss the factors driving the optimal polarimetric performance of the modules and the perspective of their application in PET.

### Primary authors

Dr Siddharth Parashari (Department of Physics, Faculty of Science, University of Zagreb) Prof. Mihael Makek (Department of Physics, Faculty of Science, University of Zagreb) Dr Tomislav Bokulić (Department of Physics, Faculty of Science, University of Zagreb) Prof. Damir Bosnar (Department of Physics, Faculty of Science, University of Zagreb) Ana Marija Kožuljević (Department of Physics, Faculty of Science, University of Zagreb) Prof. Zdenka Kuncic (School of Physics, University of Sydney) Dr Petar Žugec (Department of Physics, Faculty of Science, University of Zagreb)

### Presentation materials

 VCI-2022_V2.pdf WIN_20220219_15_48_51_Pro.mp4