Isodose 2D determining in water phantom regular and irregular fileds in radiation therapy for caculation modulated dose

AUTHORS

Mohamad Javad Tahmasebi Biragani 1 , Nahid Chegeni 2 , * , Mansur Zabihzade 3 , Shole Arvandi 4 , Sasan Razmjoo Ghalaee 4 , Fatemeh Seif 2

1 Associate professor, Department of Medical Physics, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

2 Ph.D Student of Medical Physics,Department of Medical Physics, School of Medicine, Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

3 Assistant professor, Department of Medical Physics, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

4 Assistant professor , Department of Radiotherapy, Golestan hospital, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

How to Cite: Tahmasebi Biragani M J, Chegeni N, Zabihzade M, Arvandi S, Razmjoo Ghalaee S, et al. Isodose 2D determining in water phantom regular and irregular fileds in radiation therapy for caculation modulated dose, Jentashapir J Health Res. 2013 ; 4(3):e94075.

ARTICLE INFORMATION

Jentashapir Journal of Health Research: 4 (3); e94075
Published Online: June 30, 2013
Article Type: Research Article
Received: May 19, 2019
Accepted: June 30, 2013

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Abstract

Background: The dose distribution plays an importance role in the commercial treatment planning algorithm; therefore, a patient-independent model is needed to calculate the modulated profile.

Methods: A general formula has been proposed to calculate the profiles for any field shape in the wedged and non-wedged, blocked and non-blocked fields under symmetry and asymmetry photon beam conditions. Percentage depth doses (PDDs) are measured for a large number of square fields for both energies, and 45º wedge. Accessing the accuracy of the model for profile prediction, several measurements were carried out for some special treatment fields.

Results: Comparison between measurements and calculation showed that using the γ-index in the range of 3% error in the low dose gradient region and a 3mm isodose shift in the penumbra region.

Conclusion: This analytical approach provides a general fast and accurate algorithm to calculate dose distribution for any treatment field in conventional radiotherapy.

Keywords

dose distribution equivalent field asymmetric field irregular field treatment planning

© 2013, School of Medicine, Ahvaz Jundishapur University of Medical Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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