Dose volume histogram analysis of normal structures associated with accelerated intracavitary partial breast irradiation delivered by high doserate brachytherapy and comparison with whole breast external beam radiotherapy fields
PurposeTo assess the radiation dose delivered to the heart and ipsilateral lung during accelerated partial breast brachytherapy using a MammoSiteTM applicator and compare to those produced by whole breast external beam radiotherapy (WBRT).Method and MaterialsDosimetric analysis was conducted on patients receiving MammoSite breast brachytherapy following conservative surgery for invasive ductal carcinoma. Cardiac dose was evaluated for patients with left breast tumors with a CT scan encompassing the entire heart.
Lung dose was evaluated for patients in whom the entire lung was scanned. The prescription dose of 3400cGy was 1cm from the balloon surface.
MammoSite dosimetry was compared to simulated WBRT fields with and without radiobiological correction for the effects of dose and fractionation. Dose parameters such as the volume of the structure receiving 10Gy or more (V10) and the dose received by 20cc of the structure (D20), were calculated as well as the maximum and mean doses received.
Results: Fifteen patients were studied, five had complete lung data and six had left-sided tumors with complete cardiac data.
Ipsilateral lung volumes ranged from 925-1380 cc. Cardiac volumes ranged from 337-551 cc.
MammoSite resulted in a significantly lower percentage lung V30 and lung and cardiac V20 than the WBRT fields, with and without radiobiological correction.
Conclusion: This study gives low values for incidental radiation received by the heart and ipsilateral lung using the MammoSite applicator.
The volume of heart and lung irradiated to clinically significant levels was significantly lower with the MammoSite applicator than using simulated WBRT fields of the same CT data sets.Trial RegistrationDana Farber Trial Registry number 03-179
Author: Alexandra J Stewart, Desmond A O'Farrell, Robert A Cormack, Jorgen L Hansen, Atif J Khan, Subhakar Mutyala and Phillip M Devlin
Credits/Source: Radiation Oncology 2008, 3:39
Published on: 2008-11-20
Copyright by the authors listed above - made available via BioMedCentral (Open Access). Please
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