SU-E-T-318: Source Position Localization for ICBT Tandem & Ovoid Applicators Utilizing Oncentra Brachy Applicator Modeling

Medical Physics
J Kemp, M Price

Abstract

Nucletron's Oncentra Brachy Applicator Modeling plugin (AMp) may facilitate HDR cervical brachytherapy treatment planning when image artifact inhibits dwell position localization. The AMp utilizes a 3D CAD rendering of the corresponding applicator to define possible source dwell positions. This study compares the equivalence of source localization within a CT/MR Fletcher-type tandem and ovoid applicator utilizing clinical practice and Oncentra's AMp in a water phantom containing OAR surrogate structures. KVCT image sets were acquired of a water phantom containing bladder and rectum surrogates as well as an assembled Nucletron Fletcher CT/MR applicator with various ovoid sizes (20, 25, 30mm) and a 30° tandem. Using Oncentra's Brachy TPS, OAR-surrogates were segmented and catheters were reconstructed using (1) clinical protocols (i.e. using source dwell position markers) and (2) using the AMp. Treatment plans were generated following clinical protocol, ensuring 600cGy to the ICRU 38-defined Point A. The center coordinates of each active dwell position were spatially compared. The dosimetric impact of these differences was quantified by determining D0. 1cc, D1cc and D2cc for the surrogate OARs. Preliminary results obtained for the...Continue Reading

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