Trial reportRadiation oncology (London, England)2015
Collimator rotation in volumetric modulated arc therapy for craniospinal irradiation and the dose distribution in the beam junction region.
Trial report in Radiation oncology (London, England), 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- A comparative dosimetric evaluation of two image-guided calibration strategies for multi-isocenter total body irradiation: integrated fan-beam CT-based alignment versus sequential cone-beam CT-guided localization.Frontiers in oncology · 2026Article
- Necessity of daily IGRT? Dosimetric study of beam position offsets at central double-beam junction in pediatric craniospinal irradiation.BMC cancer · 2025Article
- Craniospinal irradiation planning and delivery: a comparison between Halcyon Ring Gantry and TrueBeam C Arm LINAC delivery systems.Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology · 2025Article
- A rare instance of latent systematic error in volumetric-modulated arc therapy with field-extended multi-isocentre irradiation leading to a serious dose-delivery accident.BJR case reports · 2024Article
- Multi-isocenter VMAT craniospinal irradiation using feasibility dose-volume histogram-guided auto-planning technique.Journal of radiation research · 2023Article
- Evolution of dosimetric treatment planning for pediatric total lymphoid irradiation (TLI): a single-institution experience.Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology · 2023Article
- Optimization of collimator angles in dual-arc volumetric modulated arc therapy planning for whole-brain radiotherapy with hippocampus and inner ear sparing.Scientific reports · 2021Article
- Impact of setup errors on multi-isocenter volumetric modulated arc therapy for craniospinal irradiation.Journal of applied clinical medical physics · 2020Article
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThe purpose of this study was to investigate the role of beam collimator rotation in Volumetric Modulated Arc Therapy (VMAT) for craniospinal irradiation (CSI), and the impact on dose distribution in the beam junctions.
methodsSix adult patients were selected for the study. Six VMAT plans with different collimator angles were generated for each patient. The patients were treated in supine position with two beam isocenters. The plans were evaluated by analysis of Dose-Volume Histogram (DVHs) data for planning target volume (PTV) and organs at risk (OAR), and conformity index (CI) and homogeneity index (HI) for the target. Dose distributions in the beam junctions were examined carefully and experimentally validated in phantom, with measurement using an ion chamber array and film.
resultsThe mean values of HI and CI for the plans with different beam collimator angles were not significantly different. The numbers of segments, monitor units (MUs) and the delivery time of the plans with 45° beam collimator were obviously higher than those in plans with other beam collimator angles. When collimator angle for both sets of beams were set at 0°, there was a 1 mm low dose gap measured in the junction region.
conclusionsBy setting the collimator angle to 45°, only two isocenters were needed for the treatment of a target with the length up to 90 cm. The HI and CI of the plans were almost the same, regardless if the collimator angles were at 0°. The collimator angles for at least one set of beams should be off 0° in order to avoid a dose gap in the beam junction region.
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