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Breast skin doses from brachytherapy using MammoSite HDR, intensity modulated radiation therapy, and tangential
Raj N Selvaraj1, Ajay Bhatnagar, Sushil Beriwal
1Department of Radiation Oncology, University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA. selvarajrn@upmc.edu
Abstract:
Skin doses from brachytherapy using MammoSite HDR, Intensity Modulated Radiation Therapy (IMRT), and conventional tangential fields techniques were compared. For each treatment technique, skin doses were measured using paired thermoluminescent dosimeters placed on the patient's skin: (i) directly above the balloon catheter during MammoSite HDR brachytherapy treatments and (ii) 4 cm inside the treatment borders during the IMRT and conventional breast treatments. The mean dose measured was about 58% of the prescription dose for the patients treated using the MammoSite technique. On the other hand, for patients treated with IMRT and tangential fields, the mean dose was found to be about 69% and 71% of the corresponding prescription dose. This study suggests that in breast cancer radiation treatments the MammoSite HDR technique reduces skin doses compared to IMRT and tangential field techniques.
