Practical experience in commissioning ring applicators using ring applicator component type with bravos control software v1.2 Journal Article
| Authors: | He, X.; Trager, M. A.; Cohen, G. N.; Damato, A. L.; Aramburu Núñez, D. |
| Article Title: | Practical experience in commissioning ring applicators using ring applicator component type with bravos control software v1.2 |
| Abstract: | Purpose: The Bravos v1.2 control software introduces a ring applicator component type (ACT) with channel length verification to address geometric characteristics and dosimetric discrepancies caused by source positioning inaccuracies. This study aims to commission the ring applicator and investigate the new ring ACT in Bravos 1.2. Material and methods: We evaluated two commissioning methods for a CT/MRI-compatible titanium ring applicator across three Bravos afterloaders and compared the new ring ACT with the traditional rigid ACT. Modifications to Varian's standard commissioning method included: (1) Delivering film plans with a 0.5 cm step size instead of 1 cm; (2) Alternating 0.3 s and 1 s dwell positions for enhanced source positioning analysis; (3) Including both “odd” and “even” positions to replicate clinical conditions. Films for 30-, 45-, and 60-degree rings (3.2 cm diameter) were delivered using modified methods and manual offsets of 0.0 cm, 0.1 cm, and 0.2 cm. Discrepancies between delivered and planned positions were analyzed, and the optimal offset was validated using clinical plans. Dosimetric differences for various gross tumor volumes (GTVs) and organs at risk (OARs) were assessed. Results: Film analysis (216 films) identified 0.2 cm as the optimal offset for all rings and afterloaders, minimizing deviations between the planned and delivered dwell positions. The rigid ACT showed larger discrepancies. The optimal offset reduced physical dosimetric differences to < 1% for key clinical metrics (D95, D90, D2cc) across all angles, with negligible differences in EQD2 values. Conclusion: A novel commissioning procedure was developed to determine an optimal offset for accurate source positioning and minimize dosimetric discrepancies with the ring ACT. This method improves accuracy compared to the rigid ACT and standardizes commissioning for Bravos afterloaders with the v1.2 control system. © 2025 The Author(s). Journal of Applied Clinical Medical Physics published by Wiley Periodicals, LLC on behalf of American Association of Physicists in Medicine. |
| Keywords: | intensity modulated radiation therapy; neoplasm; neoplasms; radiotherapy dosage; radiotherapy; tomography, x-ray computed; radiation response; radiotherapy, intensity-modulated; brachytherapy; radiotherapy planning, computer-assisted; phantoms, imaging; software; commissioning; devices; procedures; organs at risk; imaging phantom; humans; human; radiotherapy planning system; x-ray computed tomography; gyn intracavity brachytherapy; ring applicator |
| Journal Title: | Journal of Applied Clinical Medical Physics |
| Volume: | 26 |
| Issue: | 6 |
| ISSN: | 1526-9914 |
| Publisher: | American College of Medical Physics |
| Date Published: | 2025-01-01 |
| Start Page: | e70064 |
| Language: | English |
| DOI: | 10.1002/acm2.70064 |
| PUBMED: | 40318089 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | Article -- Source: Scopus |
Altmetric
Citation Impact
BMJ Impact Analytics
Related MSK Work