Sep 12 – 16, 2022
OAC conference center, Kolymbari, Crete, Greece.
Europe/Athens timezone

Towards Neural Charged Particle Tracking in Proton Computed Tomography with Reinforcement Learning

Sep 13, 2022, 7:10 PM
20m
OAC conference center, Kolymbari, Crete, Greece.

OAC conference center, Kolymbari, Crete, Greece.

Talk Computer Science Progress in Computer Science

Speaker

Tobias Kortus

Description

Proton computed tomography (pCT) is an emerging imaging modality, receiving increasing importance for treatment planning in hadron therapy. One of the core challenges in the reconstruction pipeline for the high-granularity Bergen pCT Digital Tracking Calorimeter (DTC) prototype is the efficient reconstruction of high-multiplicity proton traces throughout the scanner which, in contrast to X-rays used in conventional CT, do not travel in a straight line. For this application, we propose a novel sequential tracking scheme based on model-free reinforcement learning working on graph-structured data, allowing for ground-truth free training of deep neural network architectures. For optimization, we consider only partial-information in terms of a scalar reward function, modeled based on the Gaussian approximation of the underlying theory of multiple Coulomb scattering. Given this information, we aim to find a policy that maximizes the plausibility of reconstructed tracks. We demonstrate on Monte Carlo simulated data the high potential as well as the current limitations of this approach.

Primary author

Co-authors

Nicolas Gauger (Technische Universität Kaiserslautern) Ralf Keidel (Fachhochschule Worms (DE))

Presentation materials