ArticleClinical and translational radiation oncology2025
An offline adaptive planning method based on delivered accumulated dose for brachytherapy in cervical cancer.
Article in Clinical and translational radiation oncology, 2025. 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
Background and purpose: In current clinical practice, independent treatment plan optimization for each fraction of brachytherapy might not be able to fully leverage the dosimetric advantage of the cervical cancer radiotherapy combining external beam radiotherapy (EBRT) and brachytherapy (BT). This study proposed an offline adaptive planning method based on accumulated dose for BT, aiming to improve the total dose distribution of the combined radiotherapy. Methods and materials: This study retrospectively reviewed nine cervical cancer patients treated with EBRT followed by high-dose-rate BT. For each BT fraction, we used a multi-metric deformable image registration method to accumulate the dose distributions of previously delivered EBRT and BT. The accumulated dose distribution was then imported into a customized commercial BT treatment planning system as a background in the adaptive dose optimization. Main dosimetric parameters of the target and organs at risk (OARs) were compared between the adaptive BT (ABT) and conventional BT (CBT) planning methods. Results: For approximately 70 % of the BT fractions, the ABT plans have lower D2cc to the bladder or rectum compared with the CBT plans. In terms of total dose evaluation, the ABT planning method resulted in a decrease in mean values of D2cc, V60 and V50 for the bladder (-1.9 ± 2.0 Gy Conclusion: The offline adaptive planning method could help decrease the doses to OARs and improve the total dose distribution of combined radiotherapy, showing promising prospects for clinical use.
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