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There is a concern about dose perturbation due to high-Z metallic port of temporary tissue expander (TTE) for patients with breast reconstruction undergoing to the postmastectomy radiation therapy (PMRT). The aim of this study is exactly determination the value of dose perturbation due to the presence of metallic port of TTE. The BEAMnrc code was used to simulate of a 6 MV-Primus Siemens Linac and to calculate the dose due to emerge of magnetic port (McGhan Style 133 model) at different depths in water phantom. The present depth dose and profile curves were calculated. A dose enhancement about 15% at front of the port and a dose reduction of about 10% at 5 cm distance from the backward direction of the port were resulted. The dose reduction at the shadow region of the magnetic port of TTE is significant and must be considered to calculate of accurate dose distribution.

Dose Perturbation due to the Magnetic Port of Tissue Breast Expander in Patient undergoing the Postmastectomy Radiation Therapy