open access

Vol 17, No 2 (2012)
Published online: 2012-03-01
Submitted: 2011-07-05
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Using matrix summation method for three dimensional dose calculation in brachytherapy

Mahmoud Zibandeh-Gorji, Ali Asghar Mowlavi, Saeed Mohammadi
DOI: 10.1016/j.rpor.2012.01.003
·
Rep Pract Oncol Radiother 2012;17(2):110-114.

open access

Vol 17, No 2 (2012)
Published online: 2012-03-01
Submitted: 2011-07-05

Abstract

Aim

The purpose of this study is to calculate radiation dose around a brachytherapy source in a water phantom for different seed locations or rotation the sources by the matrix summation method.

Background

Monte Carlo based codes like MCNP are widely used for performing radiation transport calculations and dose evaluation in brachytherapy. But for complicated situations, like using more than one source, moving or rotating the source, the routine Monte Carlo method for dose calculation needs a long time running.

Materials and methods

The MCNPX code has been used to calculate radiation dose around a 192Ir brachytherapy source and saved in a 3D matrix. Then, we used this matrix to evaluate the absorbed dose in any point due to some sources or a source which shifted or rotated in some places by the matrix summation method.

Results

Three dimensional (3D) dose results and isodose curves were presented for 192Ir source in a water cube phantom shifted for 10 steps and rotated for 45 and 90° based on the matrix summation method. Also, we applied this method for some arrays of sources.

Conclusion

The matrix summation method can be used for 3D dose calculations for any brachytherapy source which has moved or rotated. This simple method is very fast compared to routine Monte Carlo based methods. In addition, it can be applied for dose optimization study.

Abstract

Aim

The purpose of this study is to calculate radiation dose around a brachytherapy source in a water phantom for different seed locations or rotation the sources by the matrix summation method.

Background

Monte Carlo based codes like MCNP are widely used for performing radiation transport calculations and dose evaluation in brachytherapy. But for complicated situations, like using more than one source, moving or rotating the source, the routine Monte Carlo method for dose calculation needs a long time running.

Materials and methods

The MCNPX code has been used to calculate radiation dose around a 192Ir brachytherapy source and saved in a 3D matrix. Then, we used this matrix to evaluate the absorbed dose in any point due to some sources or a source which shifted or rotated in some places by the matrix summation method.

Results

Three dimensional (3D) dose results and isodose curves were presented for 192Ir source in a water cube phantom shifted for 10 steps and rotated for 45 and 90° based on the matrix summation method. Also, we applied this method for some arrays of sources.

Conclusion

The matrix summation method can be used for 3D dose calculations for any brachytherapy source which has moved or rotated. This simple method is very fast compared to routine Monte Carlo based methods. In addition, it can be applied for dose optimization study.

Get Citation

Keywords

Matrix summation method; MCNPX code; Dose distribution; [[ce:sup loc=" pre" ]]192Ir brachytherapy source

About this article
Title

Using matrix summation method for three dimensional dose calculation in brachytherapy

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 17, No 2 (2012)

Pages

110-114

Published online

2012-03-01

DOI

10.1016/j.rpor.2012.01.003

Bibliographic record

Rep Pract Oncol Radiother 2012;17(2):110-114.

Keywords

Matrix summation method
MCNPX code
Dose distribution
[[ce:sup loc="pre"]]192Ir brachytherapy source

Authors

Mahmoud Zibandeh-Gorji
Ali Asghar Mowlavi
Saeed Mohammadi

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