ArticleJournal of contemporary brachytherapy2026
Development of a patient-specific adaptive ring for organ at risk contours in high-dose-rate brachytherapy gynecologic cancers.
Article in Journal of contemporary brachytherapy, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: High-dose-rate (HDR) brachytherapy for gynecologic cancers requires repeated organ at risk (OAR) contouring for each fraction, which is a time-consuming task susceptible to variability. This study evaluated the use of patient-specific adaptive rings to streamline OAR contouring without compromising dosimetric accuracy and patient safety. Material and methods: Fifty HDR brachytherapy tandem and ovoid (T&O) fractions from twenty-five previously treated patients were analyzed. Two adaptive rings were investigated: one generated based on margins from clinical target volume (CTV) to 50% isodose line (IDL), and the other based on margins from CTV to 75% IDL, referred to as the 50% IDL and 75% IDL adaptive rings, respectively. Bladder, rectum, small bowel, and sigmoid were contoured within these two rings, and D Results: Errors in D Conclusions: Adaptive IDL-based rings provide an efficient strategy for OAR contouring in HDR gynecologic brachytherapy. Using adaptive rings to limit OAR contouring allows for fraction-specific adaptation, reduces contouring workload, and maintains dosimetric accuracy.
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