- Volume 16 Issue 17
DOI QR Code
Breast Radiotherapy with Mixed Energy Photons; a Model for Optimal Beam Weighting
- Birgani, Mohammadjavad Tahmasebi ;
- Fatahiasl, Jafar ;
- Hosseini, Seyed Mohammad ;
- Bagheri, Ali ;
- Behrooz, Mohammad Ali ;
- Zabiehzadeh, Mansour ;
- meskani, Reza ;
- Gomari, Maryam Talaei
- Published : 2015.12.03
Utilization of high energy photons (>10MV) with an optimal weight using a mixed energy technique is a practical way to generate a homogenous dose distribution while maintaining adequate target coverage in intact breast radiotherapy. This study represents a model for estimation of this optimal weight for day to day clinical usage. For this purpose, treatment planning computed tomography scans of thirty-three consecutive early stage breast cancer patients following breast conservation surgery were analyzed. After delineation of the breast clinical target volume (CTV) and placing opposed wedge paired isocenteric tangential portals, dosimeteric calculations were conducted and dose volume histograms (DVHs) were generated, first with pure 6MV photons and then these calculations were repeated ten times with incorporating 18MV photons (ten percent increase in weight per step) in each individual patient. For each calculation two indexes including maximum dose in the breast CTV (
Breast neoplasms;radiotherapy;treatment planning;high energy photons;toxicity
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Supported by : Ahvaz Jundishapur University of Medical Sciences