Author, as appears in the article.: Saez, J; Bar-Deroma, R; Bogaert, E; Cayez, R; Chow, T; Clark, CH; Esposito, M; Feygelman, V; Monti, AF; -Miguel, JG; Gershkevitsh, E; Goossens, J; Herrero, C; Hussein, M; Khamphan, C; Kierkels, RGJ; Lechner, W; Lemire, M; Nevelsky, A; Nguyen, D; Paganini, L; Pasler, M; Azorín, JFP; Garcia, LIR; Russo, S; Shakeshaft, J; Vieillevigne, L; Hernandez, V
Department: Ciències Mèdiques Bàsiques
URV's Author/s: Hernandez Masgrau, Victor
Keywords: Vmat Standardization Radiotherapy, intensity-modulated Radiotherapy planning, computer-assisted Radiotherapy dosage Radiometry Phantoms, imaging Mlc Imrt Humans Dosimetric leaf gap Comissioning Audits vmat standardization radiotherapy radiation-therapy photon parameters monte-carlo imrt dose calculation delivery comissioning audits accuracy
Abstract: To demonstrate the feasibility of characterising MLCs and MLC models implemented in TPSs using a common set of dynamic beams.A set of tests containing synchronous (SG) and asynchronous sweeping gaps (aSG) was distributed among twenty-five participating centres. Doses were measured with a Farmer-type ion chamber and computed in TPSs, which provided a dosimetric characterisation of the leaf tip, tongue-and-groove, and MLC transmission of each MLC, as well as an assessment of the MLC model in each TPS. Five MLC types and four TPSs were evaluated, covering the most frequent combinations used in radiotherapy departments.Measured differences within each MLC type were minimal, while large differences were found between MLC models implemented in clinical TPSs. This resulted in some concerning discrepancies, especially for the HD120 and Agility MLCs, for which differences between measured and calculated doses for some MLC-TPS combinations exceeded 10%. These large differences were particularly evident for small gap sizes (5 and 10 mm), as well as for larger gaps in the presence of tongue-and-groove effects. A much better agreement was found for the Millennium120 and Halcyon MLCs, differences being within ±5% and ±2.5%, respectively.The feasibility of using a common set of tests to assess MLC models in TPSs was demonstrated. Measurements within MLC types were very similar, but TPS dose calculations showed large variations. Standardisation of the MLC configuration in TPSs is necessary. The proposed procedure can be readily applied in radiotherapy departments and can be a valuable tool in IMRT and credentialing audits.Copyright © 2023. Published by Elsevier B.V.
Thematic Areas: Saúde coletiva Radiology, nuclear medicine and imaging Radiology, nuclear medicine & medical imaging Oncology Odontología Medicina ii Medicina i Interdisciplinar Hematology General medicine Engenharias iv Engenharias ii Ciências biológicas ii Ciências biológicas i Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: victor.hernandez@urv.cat
Author identifier: 0000-0003-3770-8486
Record's date: 2024-08-03
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Radiotherapy And Oncology. 186 109775-109775
APA: Saez, J; Bar-Deroma, R; Bogaert, E; Cayez, R; Chow, T; Clark, CH; Esposito, M; Feygelman, V; Monti, AF; -Miguel, JG; Gershkevitsh, E; Goossens, J; Her (2023). Universal evaluation of MLC models in treatment planning systems based on a common set of dynamic tests. Radiotherapy And Oncology, 186(), 109775-109775. DOI: 10.1016/j.radonc.2023.109775
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications
Repositori URV