Journal of Biomedical Physics and Engineering

Modification of Source Strength in Low-Dose-Rate Lung Brachytherapy with 125I and 103Pd seeds

Document Type : Original Research

Authors

H Rezaei 1
H Mostaghimi 2, 3
A R Mehdizadeh 2, 3

1 Department of Radiology, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

2 Department of Biomedical Physics and Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran

3 Advanced Health Technologies Research Center, Shiraz University of Medical Sciences, Shiraz, Iran

Abstract
Background: A new treatment approach for most patients who have undergone early stage non-small-cell lung carcinoma (NSCLC) is wedge resection plus permanent implant brachytherapy. However, the specification of dose to medium at low energies especially in heterogeneous lung is unclear yet.
Objective: The present study aims to modify source strength for different configurations of 125I and 103Pd seeds used in lung permanent implant brachytherapy.
Methods: Different arrays of 125I and 103Pd seeds were simulated by MCNPX code in protocol-based water vs. actual 3D lung environments. Absorbed dose was, then, scored in both mediums. Dose differences between both environments were calculated and source strength was modified for the prescription point. In addition, lung-to-water absorbed dose ratio was obtained and presented by precise equations.
Results: Due to significant differences in prescription dose, source strength was modified 16%-19% and 37%-43% for different configurations of 125I and 103Pd seeds, respectively. In addition, depth-dependent dose differences were observed between the actual lung and protocol-based water mediums (dose difference as a function of depth).
Conclusion: Modification of source strength is essential for different arrangements of 125I and 103Pd seeds in lung implantation. Modified source strength and presented equations are recommended to be considered in future studies based on lung brachytherapy.

Keywords

125I seed
103Pd seed
lung permanent implant brachytherapy
Monte Carlo Method
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Journal of Biomedical Physics and Engineering
Volume 7, Issue 3 - Serial Number 3
25
September and October 2017
Pages 191-204

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