ArticleRadiological physics and technology2026
Development and validation of a DICOM-based prediction model for instantaneous dose rate and delivery time in VMAT.
Article in Radiological physics and technology, 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
This study developed and validated a deterministic, constraint-based model for predicting instantaneous dose rates and total delivery times. A constraint-based Python model extracted treatment plan parameters from DICOM-RT Plan files and simulated the dose rate using three mechanical constraints: multileaf collimator (MLC) velocity, gantry rotation speed, and nominal dose rate, and incorporated geometric beam-off constraints such as avoidance sectors. Validation used high-resolution trajectory logs from a TrueBeam STx across 26 clinical VMAT arcs, including flattened and flattening-filter-free modes. Predicted dose rates agreed well with trajectory logs, with a mean absolute error of 60 MU/min and a root-mean-square error of 140 MU/min for the instantaneous dose rate. Predicted and actual delivery times showed a mean error of - 0.8 ± 0.8 s. This deterministic framework provides an accurate and efficient tool for pre-delivery plan assessment and clinical scheduling, as supported by its high agreement with trajectory log data.
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