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Acoustic Bragg peak localization in proton therapy treatment: Simulation studies
Jorge Vega Otero * 1 , Ivan Enguix Felis 2 , Miguel Ramirez Ardid 3 , Alicia Debón Herrero 4 , José Antonio Merchán Díaz 5
1  Institut d’Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC), Universitat Politècnica de València (UPV)
2  Centro Tecnológico Naval y del Mar
3  Institut d’Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC), Universitat Politècnica de València (UPV)
4  Institut de Matemàtica Multidisciplinar, Universitat Politècnica de València (UPV)
5  Grupo de Fisica Nuclear Aplicada y Simulación, Universidad Pedagógica y Tecnológica de Colombia (UPTC)

Published: 14 November 2019 by MDPI AG in 6th International Electronic Conference on Sensors and Applications session Applications
10.3390/ecsa-6-06533 (registering DOI)
Abstract:

A full chain simulation of the acoustic handontherapy monitoring for brain tumors is presented in this work. For the study, a proton beam of 100 MeV is considered. In the first stage, Geant4 is used to simulate the energy deposition and to study the behavior of the Bragg peak. The energy deposition in the medium produces local heating that can be considered instantaneous with respect to the hydrodynamic time scale producing a sound pressure wave. The resulting thermoacoustic signal has been subsequently obtained by solving the thermoacoustic equation. The acoustic propagation has been simulated by FEM methods in the brain and the skull, where a set of piezoelectric sensors are placed. Last, the final received signals in the sensors have been processed in order to reconstruct the position of the thermal source and, thus, to determine the feasibility and accuracy of acoustic beam monitoring in handontherapy.

Keywords: Geant4; Bragg Peak; Thermoacoustic; Finite element method; Piezoelectric Ceramic.
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