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

Mohamad Javad Tahmasebi Biragani; Nahid Chegeni; Mansur Zabihzade; Shole Arvandi; Sasan Razmjoo Ghalaee; Fatemeh Seif

Jentashapir Journal of Cellular and Molecular Biology

Official Journal of Ahvaz Jundishapur University of Medical Sciences

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

Authors:

Mohamad Javad Tahmasebi Biragani¹,

Nahid Chegeni^2,*,

Mansur Zabihzade³,

Shole Arvandi⁴,

Sasan Razmjoo Ghalaee⁴,

Fatemeh Seif²

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

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

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

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

Jentashapir Journal of Cellular and Molecular Biology:Vol. 4, issue 3; e94075

Published online:Jun 30, 2013

Article type:Research Article

Received:May 19, 2019

Accepted:Jun 30, 2013

How to Cite:Mohamad Javad Tahmasebi BiraganiNahid ChegeniMansur ZabihzadeShole ArvandiSasan Razmjoo GhalaeeFatemeh Seifet al.Isodose 2D determining in water phantom regular and irregular fileds in radiation therapy for caculation modulated dose.4(3):e94075.

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

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