ArticleJournal of applied clinical medical physics2025
Effective spot size parameters for Acuros dose calculation algorithm using enhanced leaf modelling: Estimation based on small rectangular MLC fields.
Article in Journal of applied clinical medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Dose accuracy evaluation of multi-leaf collimator modeling in single-isocenter multi-target stereotactic radiosurgery.Physics and imaging in radiation oncology · 2026Article
- Effective spot size parameters for Acuros dose calculation algorithm using enhanced leaf modelling: Estimation based on small rectangular MLC fields.Journal of applied clinical medical physics · 2025Article
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8 authors.
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Abstract
background and purposeSmall field dosimetry plays a critical role in stereotactic radiotherapy, particularly for elongated fields shaped by multileaf collimators (MLCs). This study aims to optimize the Effective Spot Size (ESS) parameters in the Acuros dose calculation algorithm (Eclipse v18.0, with the enhanced leaf modelling ELM for MLC modelling) for accurate dose calculations of small, rectangular MLC-shaped fields. Measurements were based on the TRS-483 protocol and a recently proposed equivalent square field size determination method.
methodsField output factors (FOFs) were measured using a Varian TrueBeam linear accelerator with HD-MLC for 6 MV and 10 MV beams (both flattened and unflattened). Symmetric square and rectangular fields (0.5-4 cm sides) were shaped by the MLC, with jaws fixed at 4.4 × 4.4 cm
resultsThe optimized ESS parameters minimized FOF discrepancies between calculated and measured doses for elongated fields, improving calculation accuracy compared to vendor-recommended settings (ESSx = 0.5 mm, ESSy = 0.7 mm). Profiles and penumbra analyses supported these findings.
conclusionsELM in Eclipse v.18 improves MLC modelling by representing rounded leaf ends. Only ESS parameters remain user-tunable. A method to determine the ESS for the Acuros algorithm is presented, resulting in accurate algorithm configuration for elongated small fields shaped by an HD-MLC. Results are presented using 6 MV and 10 MV beams, both flattened and unflattened for an HD-MLC Varian. ESS affects output factors and penumbra, with dose calculations matching measurements within 0.2% ± 0.4% and a maximum difference of 1.1%.
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