题名

Monte Carlo Study on Does Enhancement Effect of Various Paramagnetic Nanoshells in Brachytherapy

DOI

10.5405/jmbe.1769

作者

Toktam Ahmadi Moghaddas;Mahdi Ghorbani;Abbas Haghparast;Ryan Thomas Flynn;Mohammad Taghi Eivazi

关键词

Brachytherapy ; Nanoshell ; Dose enhancement ; Monte Carlo

期刊名称

Journal of Medical and Biological Engineering

卷期/出版年月

34卷6期(2014 / 12 / 01)

页次

559 - 567

内容语文

英文

英文摘要

The dose enhancement effect of various paramagnetic nanoshells irradiated with various brachytherapy sources was calculated. ^(125)I, ^(103)Pd, hypothetical ^(169)Yb, and ^(192)Ir brachytherapy sources were simulated using the MCNPX Monte Carlo code. The dose rate constants and radial dose functions of the sources were calculated and compared with previously published data. Au/Gd, Au/Fe_2O_3, Ag/Dy, and Ag/Mn nanoshells with concentrations of 10, 20, and 30 mg/ml in tumor tissue were simulated. A soft-tissue phantom containing a 1 cm×1 cm×1 cm tumor was loaded with nanoshells. The dose enhancement factor (DEF) was calculated in voxels inside and outside the tumor. The highest average DEFs in tumor tissue were observed with the ^(125)I source for the 30 mg/ml tumor concentration, with DEF values for Au/Gd, Au/Fe_2O_3, Ag/Dy, and Ag/Mn nanoshells of 3.25, 2.82, 2.86, and 2.77, respectively. The calculated dose rate constant and radial dose function of the sources were in good agreement with previously published data. Based on our results, nanoshells can be utilized in brachytherapy to enhance the tumor dose and because of their biocompatible shells, their toxic effects can be avoided. The nanoshells are paramagnetic and can be applied simultaneously in brachytherapy and magnetic resonance imaging. However, clinical application of nanoshells in brachytherapy requires more preclinical studies.

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醫藥衛生 > 基礎醫學