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Purpose: To describe dose-volume data from a 50-kV electronic brachytherapy source in intracavitary accelerated partial breast irradiation.
Methods And Materials: Three spherical balloon applicators were imaged on a CT scanner in a water phantom and inflated throughout their suggested fill volume range. The planning target volume (PTV) was defined as a 1-cm margin around the balloon surface. Plans were created achieving 80%, 85%, and 90% coverage of the PTV, with a prescription dose of 34Gy in 10 fractions. The PTV, V(90), V(100), V(150), V(200), and V(300) were recorded for each plan.
Results: For 80% target coverage, the V(200) varies from 11 to 14 cm(3) and the V(150) from 26 to 49 cm(3) over all the balloon applicators and fill volumes. For 85% coverage, the V(200) varies from 14 to 18 cm(3) and the V(150) from 27 to 53 cm(3). For 90% coverage, the V(200) varies from 16 to 22 cm(3) and the V(150)cm(3) from 30 to 61 cm(3).
Conclusions: Fifty-kilovolt electronic brachytherapy can provide PTV coverage similar to (192)Ir in the setting of intracavitary accelerated partial breast irradiation.
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| http://dx.doi.org/10.1016/j.brachy.2007.03.002 | DOI Listing |
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