open access

Vol 19, No 6 (2014)
Original research articles
Published online: 2014-11-01
Submitted: 2013-05-14
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Evaluation of energy deposition and secondary particle production in proton therapy of brain using a slab head phantom

Sayyed Bijan Jia, Mohammad Hadi Hadizadeh, Ali Asghar Mowlavi, Mahdy Ebrahimi Loushab
DOI: 10.1016/j.rpor.2014.04.008
·
Rep Pract Oncol Radiother 2014;19(6):376-384.

open access

Vol 19, No 6 (2014)
Original research articles
Published online: 2014-11-01
Submitted: 2013-05-14

Abstract

Aim

Evaluation of energy deposition of protons in human brain and calculation of the secondary neutrons and photons produced by protons in proton therapy.

Background

Radiation therapy is one of the main methods of treating localized cancer tumors. The use of high energy proton beam in radiotherapy was proposed almost 60 years ago. In recent years, there has been a revival of interest in this subject in the context of radiation therapy. High energy protons suffer little angular deflection and have a well-defined penetration range, with a sharp increase in the energy loss at the end of their trajectories, namely the Bragg peak.

Materials and methods

A slab head phantom was used for the purpose of simulating proton therapy in brain tissue. In this study simulation was carried out using the Monte Carlo MCNPX code.

Results

By using mono energetic proton pencil beams, energy depositions in tissues, especially inside the brain, as well as estimating the neutron and photon production as a result of proton interactions in the body, together with their energy spectra, were calculated or obtained. The amount of energy escaped from the head by secondary neutrons and photons was determined.

Conclusions

It was found that for high energy proton beams the amount of escaped energy by neutrons is almost 10 times larger than that by photons. We estimated that at 110[[ce:hsp sp="0.25"/]]MeV beam energy, the overall proton energy “leaked” from the head by secondary photons and neutrons to be around 1%.

Abstract

Aim

Evaluation of energy deposition of protons in human brain and calculation of the secondary neutrons and photons produced by protons in proton therapy.

Background

Radiation therapy is one of the main methods of treating localized cancer tumors. The use of high energy proton beam in radiotherapy was proposed almost 60 years ago. In recent years, there has been a revival of interest in this subject in the context of radiation therapy. High energy protons suffer little angular deflection and have a well-defined penetration range, with a sharp increase in the energy loss at the end of their trajectories, namely the Bragg peak.

Materials and methods

A slab head phantom was used for the purpose of simulating proton therapy in brain tissue. In this study simulation was carried out using the Monte Carlo MCNPX code.

Results

By using mono energetic proton pencil beams, energy depositions in tissues, especially inside the brain, as well as estimating the neutron and photon production as a result of proton interactions in the body, together with their energy spectra, were calculated or obtained. The amount of energy escaped from the head by secondary neutrons and photons was determined.

Conclusions

It was found that for high energy proton beams the amount of escaped energy by neutrons is almost 10 times larger than that by photons. We estimated that at 110[[ce:hsp sp="0.25"/]]MeV beam energy, the overall proton energy “leaked” from the head by secondary photons and neutrons to be around 1%.

Get Citation

Keywords

Proton therapy; Slab head phantom; Bragg peak; Energy deposition; Secondary particle production

About this article
Title

Evaluation of energy deposition and secondary particle production in proton therapy of brain using a slab head phantom

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 19, No 6 (2014)

Pages

376-384

Published online

2014-11-01

DOI

10.1016/j.rpor.2014.04.008

Bibliographic record

Rep Pract Oncol Radiother 2014;19(6):376-384.

Keywords

Proton therapy
Slab head phantom
Bragg peak
Energy deposition
Secondary particle production

Authors

Sayyed Bijan Jia
Mohammad Hadi Hadizadeh
Ali Asghar Mowlavi
Mahdy Ebrahimi Loushab

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