Author, as appears in the article.: Kazantsev, P; Lechner, W; Gershkevitsh, E; Clark, CH; Venencia, D; Van Dyk, J; Wesolowska, P; Hernandez, V; Jornet, N; Tomsej, M; Bokulic, T; Izewska, J
Department: Ciències Mèdiques Bàsiques
URV's Author/s: Hernandez Masgrau, Victor
Keywords: System Radiotherapy, intensity-modulated Radiotherapy planning, computer-assisted Radiotherapy dosage Radiotherapy Radiometry Quality-assurance Quality assurance, health care Qa Pilot projects Phantoms, imaging Multicenter Medical audit International agencies Imrt Humans Head and neck neoplasms Head Feasibility studies Dosimetry audit Criteria
Abstract: Background: The IAEA has developed and tested an on-site, end-to-end IMRT/VMAT dosimetry audit methodology for head and neck cases using an anthropomorphic phantom. The audit methodology is described, and the results of the international pilot testing are presented. Material and methods: The audit utilizes a specially designed, commercially available anthropomorphic phantom capable of accommodating a small volume ion chamber (IC) in four locations (three in planning target volumes (PTVs) and one in an organ at risk (OAR)) and a Gafchromic film in a coronal plane for the absorbed dose to water and two-dimensional dose distribution measurements, respectively. The audit consists of a pre-visit and on-site phases. The pre-visit phase is carried out remotely and includes a treatment planning task and a set of computational exercises. The on-site phase aims at comparing the treatment planning system (TPS) calculations with measurements in the anthropomorphic phantom following an end-to-end approach. Two main aspects were tested in the pilot study: feasibility of the planning constraints and the accuracy of IC and film results in comparison with TPS calculations. Treatment plan quality was scored from 0 to 100. Results: Forty-two treatment plans were submitted by 14 institutions from 10 countries, with 79% of them having a plan quality score over 90. Seventeen sets of IC measurement results were collected, and the average measured to calculated dose ratio was 0.988 +/- 0.016 for PTVs and 1.020 +/- 0.029 for OAR. For 13 film measurement results, the average gamma passing rate was 94.1% using criteria of 3%/3 mm, 20% threshold and global gamma. Conclusions: The audit methodology was proved to be feasible and ready to be adopted by national dosimetry audit networks for local implementation.
Thematic Areas: Radiology, nuclear medicine and imaging Oncology Medicine (miscellaneous) Medicina ii Medicina i Hematology General medicine Ciências biológicas iii Biotecnología
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: 2024-06-28
Papper version: info:eu-repo/semantics/publishedVersion
Papper original source: Acta Oncologica. 59 (2): 141-148
APA: Kazantsev, P; Lechner, W; Gershkevitsh, E; Clark, CH; Venencia, D; Van Dyk, J; Wesolowska, P; Hernandez, V; Jornet, N; Tomsej, M; Bokulic, T; Izewska, (2020). IAEA methodology for on-site end-to-end IMRT/VMAT audits: an international pilot study. Acta Oncologica, 59(2), 141-148. DOI: 10.1080/0284186X.2019.1685128
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
Publication Type: Journal Publications
Repositori URV