ArticleJournal of applied clinical medical physics2021
Consistency of small-field dosimetry, on and off axis, in beam-matched linacs used for stereotactic radiosurgery.
Article in Journal of applied clinical medical physics, 2021. 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, 10 citations in OpenAlex.
- Clinical evaluation of the golden beam data in the monaco treatment planning system for the harmony pro and infinity linear accelerators.Journal of applied clinical medical physics · 2026Article
- Evaluating Monaco 6.2.2 in complex radiotherapy across matched LINACs: improved MLC modelling and dose accuracy with virtual source model 2.0.Physical and engineering sciences in medicine · 2025Article
- Stereotactic radiotherapy for brain metastases of non-small cell lung cancer: A comprehensive review.World journal of radiology · 2025Review
- Impact of brain metastasis size at the time of radiotherapy on local control and radiation necrosis.Journal of neuro-oncology · 2025Article
- Dosimetric characteristics of 6MV flattening filter free and flattened beams among beam-matched linacs: a three-institutional study.Radiation oncology (London, England) · 2023Article
- A method for selecting reference beam model of VMAT plans with three 6MV beam-matched linear accelerators during radiation oncology.Scientific reports · 2023Article
- A novel QA phantom based on scintillating fiber ribbons with implementation of 2D dose tomography for small-field radiotherapy.Medical physics · 2023Article
- Matched linac stereotactic radiotherapy: An assessment of delivery similarity and distributive patient-specific quality assurance feasibility.Journal of applied clinical medical physics · 2022Article
- Variation in Elekta iView electronic portal imager pixel scale factor with gantry angle, and impact on multi-leaf collimator quality assurance.Journal of applied clinical medical physics · 2022Article
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Authors and funding
8 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
purposeStereotactic radiosurgery (SRS) can be delivered with a standard linear accelerator (linac). At institutions having more than one linac, beam matching is common practice. In the literature, there are indications that machine central axis (CAX) matching for broad fields does not guarantee matching of small fields with side ≤2 cm. There is no indication on how matching for broad fields on axis translates to matching small fields off axis. These are of interest to multitarget single-isocenter (MTSI) SRS planning and the present work addresses that gap in the literature.
methodsWe used 6 MV flattening filter free (FFF) beams from four Elekta VersaHD® linacs equipped with an Agility™ multileaf collimator (MLC). The linacs were strictly matched for broad fields on CAX. We compared output factors (OPFs) and effective field size, measured concurrently using a novel 2D solid-state dosimeter "Duo" with a spatial resolution of 0.2 mm, in square and rectangular static fields with sides from 0.5 to 2 cm, either on axis or away from it by 5 to 15 cm.
resultsAmong the four linacs, OPF for fields ≥1 × 1 cm
conclusionsVerification of small-field consistency for matched linacs used for SRS is an important task for dosimetric validation. A significant benefit of concurrent measurement of field size and OPF allowed for a comprehensive assessment using a novel diode array. Our study showed the four linacs, strictly matched for broad fields on CAX, were still matched down to a field size of 1 x 1 cm
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