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The Effect of Phantom Material On Accuboost HDR Brachytherapy

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M Papie

M Papie1*, R Faghihi1,2 , S Sina1,2 , (1) School of Mechanical Engineering, Shiraz University, Shiraz, Iran (2) School of Mechanical Engineering, Shiraz University, Shiraz, Iran


SU-I-GPD-T-33 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: Accelerated partial breast irradiation (APBI) with high dose rate brachytherapy has been found as an effective treatment for breast cancer. The purpose of this study is To evaluate the effects of breast phantom material composition on dose distribution caused by Accuboost-brachytherapy using MCNP5 Monte Carlo code.

Methods: Accuboost is a peripheral breast brachytherapy device for Partial breast irradiation. This device allows delivering prescribed dose from HDR breast brachytherapy sources located inside two collimated applicators placed on both sides of the breast. In this study eighteen sources were placed inside two rounded applicators positioned in both sides of the breast. A Tungsten alloy cone shield is used to collimate the radiations toward the PTV. Fourteen different phantoms were considered as breast tissue. The phantoms were water, and six compositions of adipose and gland, and two compositions recommended by ICRU44, and TG-186 as the normal breast tissue.

Results: According to the results obtained the PTV dose in different phantoms shows less than 1% deviation from the dose to water. Dosimetry comparison for skin in contact with applicators, shows differences less than 5%.

Conclusion: The TG-43-based TPSs perform their calculations in water phantom. The results of this study indicates that for APBI, TG-43 algorithm can be used in treatment planning systems without significant errors.

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