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Dosimetry audits for passive motion management require dynamically-acquired measurements in a moving phantom to be compared to statically calculated planned doses. This study aimed to characterise the relationship between planning and delivery errors, and the measured dose in the Imaging and Radiation Oncology Core (IROC) thorax phantom, to assess different audit scoring approaches. Treatment plans were created using a 4DCT scan of the IROC phantom, equipped with film and thermoluminescent dosimeters (TLDs). Plans were created on the average intensity projection from all bins. Three levels of ...

Automated 3D Dose-volume Verification: Gearing Up for Complex Planning scenarios LAP is prioritizing clinical awareness, uptake and application of the automated 3D dose-check functionality now incorporated into its RadCalc QA software May 25, 2021 — Independent verification always has been, and likely always will be, the core value proposition for RadCalc QA secondary check software. For more than two decades, this suite of widely deployed quality assurance (QA) tools has provided medical physicists and dosimetrists with fully automated and independent dosimetric verification of their r...

Abstract Purpose: To investigate intrinsic sensitivity of an electronic portal imaging device (EPID) and the ArcCHECK detector and to use this in assessing their performance in detecting delivery variations for lung SBRT VMAT. The effect of detector spatial resolution and dose matrix interpolation on the gamma pass rate was also considered. Materials and methods: Fifteen patients’ lung SBRT VMAT plans were used. Delivery variations (errors) were introduced by modifying collimator angles, multi-leaf collimator (MLC) field sizes and MLC field shifts by ±5, ±2, and ±1 degrees or mm (investi...