SU-E-T-432: Comparison of HDR Treatment Plans for Interstitial Brachytherapy with Intracavitary Savi Brachytherapy for Post Lumpectomy Breast Cancer

Medical Physics
M NairJ Davis

Abstract

To compare the dose distributions from HDR brachytherapy using interstitial catheter implants and Intracavitary Savi applicator for breast cancer patients following lumpectomy. We have treated over 200 post lumpectomy breast patients with brachytherapy and Savi applicator (Cianna Medical) . The interstitial technique used a custom built template for placement of catheters under the image guidance. The Savi applicator was placed into the resected cavity and the applicator was expanded to cover the cavity under CT image guidance. The criteria used for plan evaluation was prescription dose covered 95 to 100% of the volume 1.5× prescribed dose to cover <30% of the PTV and 2.0 × prescribed dose covered <10% of the PTV. The Savi plans were evaluated with PTVeval to cover 90 to 95% of the prescribed dose and 1.5×PTVeval not to exceed 50cc, 2×PTVeval to cover <10% of volume. The PTV for interstitial ranged from 29 to 170cc, and that for Savi the PTVeval varied from 28 to 111. For interstitial the 1.5× dose reference expressed as % of PTV varied from 11% to 30% with a median at 24.9%. For Savi the 1.5× dose reference volume expressed as % of PTVeval ranged from 30 to 50% with a median of 40%. The 2× dose reference covered volume express...Continue Reading

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