Dose Perturbation due to the Magnetic Port of Tissue Braest Expander in Patient undergoing the Postmastectomy Radiation Therapy
Mansour Zabihzadeh1, 2,3, Mojtaba Hoseini Ghahfarokhi1,3, Sasan Razmjoo-Ghalaei,Sholeh Arvandi2 and Zohreh Mashayekhi1,*1 Department of Medical Physics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. 2 Departments of Clinical Oncology, Golestan Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. 3Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Abstract: 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.
Keywords: Breast cancer; Dose perturbation; Postmastectomy radiation therapy; Magnetic port; Temporary tissue expander Back to TOC