ArticleJournal of applied clinical medical physics2020
The impact of isocentric shifts on delivery accuracy during the irradiation of small cerebral targets-Quantification and possible corrections.
Article in Journal of applied clinical medical physics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- Dosimetric intercomparison for stereotactic radiotherapy of multiple brain metastases.Physics and imaging in radiation oncology · 2026Article
- A comprehensive investigation of the radiation isocentre spatial variability in linear accelerators: implications for commissioning, QA, and clinical protocols.Physical and engineering sciences in medicine · 2025Article
- Five-year evaluation of linear accelerator-based SRS platform isocentricity.Journal of applied clinical medical physics · 2025Article
- Assessing focal spot alignment in clinical linear accelerators: a comprehensive evaluation with triplet phantoms.Physical and engineering sciences in medicine · 2024Article
- Automatic measurement of beam-positioning accuracy at off-isocenter positions.Journal of applied clinical medical physics · 2023Article
- Detection of rotational errors in single-isocenter multiple-target radiosurgery: Is a routine off-axis Winston-Lutz test necessary?Journal of applied clinical medical physics · 2022Article
- Implementing corrections of isocentric shifts for the stereotactic irradiation of cerebral targets: Clinical validation.Journal of applied clinical medical physics · 2022Article
- Dosimetric impact of mechanical movements of the Linac gantry during treatments with small fields.Frontiers in oncology · 2022Article
- Technical Note: Effects of rotating gantry on magnetic field and eddy currents in 0.35 T MRI-guided radiotherapy (MR-IGRT) system.Medical physics · 2021Article
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Authors and funding
4 authors.
Funding
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Abstract
purposeTo assess the impact of isocenter shifts due to linac gantry and table rotation during cranial stereotactic radiosurgery on D
methodsWinston-Lutz (WL) checks were performed on two Elekta Synergy linacs. A stereotactic quality assurance (QA) plan was applied to the ArcCHECK phantom to assess the impact of isocenter shift corrections on Gamma pass rates. These corrections included gantry sag, distance of collimator and couch axes to the gantry axis, and distance between cone-beam computed tomography (CBCT) isocenter and treatment beam (MV) isocenter. We applied the shifts via script to the treatment plan in Pinnacle 16.2. In a planning study, isocenter and mechanical rotation axis shifts of 0.25 to 2 mm were applied to stereotactic plans of spherical planning target volumes (PTVs) of various volumes. The shifts determined via WL measurements were applied to 16 patient plans with PTV sizes between 0.22 and 10.4 cm
resultsArcCHECK measurements of a stereotactic treatment showed significant increases in Gamma pass rate for all three measurements (up to 3.8 percentage points) after correction of measured isocenter deviations. For spherical targets of 1 cm
conclusionMechanical deviations during gantry, collimator, and table rotation may adversely affect the treatment of small stereotactic lesions. Adjustments of beam isocenters in the treatment planning system (TPS) can be used to both quantify their impact and for prospective correction of treatment plans.
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