Multigap RPC for PET: development and optimisation of the detector design

TL;DR

This paper explores transforming resistive plate chambers into gamma-ray detectors for PET-MRI systems, optimizing their design through simulations to enhance efficiency and electron yield.

Contribution

It introduces a novel detector design using a sandwich structure with Bi or Pb converters, validated by GEANT4 simulations, for improved PET imaging.

Findings

Sandwich-type gas-insulator-converter design is optimal.

Bi and Pb are effective converter materials.

Simulation results support detector efficiency improvements.

Abstract

Transforming the resistive plate chambers from charged-particle into gamma-quanta detectors opens the way towards their application as a basic element of a hybrid imaging system, which combines positron emission tomography (PET) with magnetic resonance imaging (MRI) in a single device and provides non- and minimally- invasive quantitative methods for diagnostics. To this end, we performed detailed investigations encompassing the whole chain from the annihilation of the positron in the body, through the conversion of the created photons into electrons and to the optimization of the electron yield in the gas. GEANT4 based simulations of the efficiency of the RPC photon detectors with different converter materials and geometry were conducted for optimization of the detector design. The results justify the selection of a sandwich-type gas-insulator-converter design, with Bi or Pb as converter materials.