ArticleReports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology2026
Dosimetric validation of biaxially rotational dynamic-radiation therapy using an O-ring linear accelerator.
Article in Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology, 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
Background: Biaxially rotating O-ring linear accelerators equipped with biaxially rotating gantry-ring mechanics enable non-coplanar arc delivery without the need for couch rotation. This architecture is intended to achieve conformal dose distributions and enable efficient non-coplanar delivery compared with couch-rotated techniques. However, clinical implementation requires dosimetric verification to confirm delivery accuracy. This study aimed to validate the dosimetric accuracy and treatment efficiency of a biaxially rotating O-ring linac using AAPM Task Group (TG)-119 and TG-244 test cases, with reference to TG-218 acceptance criteria. Materials and methods: In this retrospective phantom-based dosimetric validation study, 26 treatment plans were generated in RayStation based on TG-119 and TG-244 and delivered as coplanar VMAT (cVMAT) or non-coplanar VMAT [dynamic swing arc (DSA)]. Point dose measurements were performed with an A1SL ionisation chamber, and dose distribution verification was conducted using the Delta4 Phantom+. Monitor units (MU) and beam-on time (BOT) were compared between cVMAT and DSA. Results: All plans met the ±3% tolerance for absolute point-dose error (measured Conclusions: This study demonstrated dosimetric validation of a biaxially rotating O-ring linear accelerator using TG-119 and TG-244 test cases. The system achieved high accuracy in both cVMAT and DSA deliveries, supporting the dosimetric readiness for clinical implementation.
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