ArticleThe British journal of radiology2025
The impact of plan complexity on dose delivery deviations resulting from multileaf collimator positioning errors in volumetric modulated arc therapy.
Article in The British journal of radiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- A Multidimensional Assessment of the Aperture Shape Controller in VMAT for Ca Tongue: Implications for Plan Complexity and Quality Assurance.Asian Pacific journal of cancer prevention : APJCP · 2026Article
- Evaluating the trade-off between plan complexity, dosimetric accuracy, and treatment efficiency: Role of aperture shape controller settings in HyperArc for intracranial oligometastases.Precision radiation oncology · 2025Article
- Comparison of log file-based and measurement-based QA for detecting MLC positional errors and evaluating dosimetric impacts of MLC defects.Journal of applied clinical medical physics · 2025Article
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Authors and funding
6 authors.
Funding
Abstract
objectivesThis study aimed to assess the effect of plan complexity on dosimetric alterations induced by multileaf collimator (MLC) misplacements in volumetric modulated arc therapy (VMAT).
methodsVolumetric modulated arc therapy plans for 14 cervical and 10 lung cancer cases were reoptimized utilizing 3 distinct aperture shape controller (ASC) settings (none, very high, and very low), resulting in 3 plan groups: ASC-none, ASC-vh, and ASC-vl. Four types of MLC position errors were simulated: total shifts (Type 1), open/closed (Type 2), right-side shifts (Type 3), and left-side shifts (Type 4). Plan complexity was assessed using the small aperture score (SAS). Dose deviations resulting from various MLC positioning errors and SAS values were calculated and compared among the 3 ASC groups.
resultsThe variations in planning target volume (PTV) D95% for cervical cancer were approximately 0.6%, 3.7%, 1.9%, and 1.8% per millimetre for Types 1-4 errors, respectively. In the case of lung cancer, the changes were 2.3%, 9.3%, 5.3%, and 4.6% per millimetre. The ASC-vh and ASC-vl groups exhibited significantly reduced dose changes and SAS values in response to MLC errors, as compared to the ASC-none group (P < .05).
conclusionsHighly complex plans exhibit greater dose sensitivity to MLC positional errors. The application of ASC proves effective in reducing plan complexity and mitigating the influence of MLC errors on dose deviation. ADVANCES IN KNOWLEDGE: By elucidating the relationship between dosimetric impacts from MLC errors and plan complexity, this study offers valuable guidance for the design of radiotherapy plans, helping to enhance the accuracy and effectiveness of VMAT treatments.
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