2026-04-13T03:09:02Zhttps://recercat.cat/oai/request

oai:recercat.cat:11351/101572025-10-24T08:28:15Zcom_2072_451660com_2072_378040col_2072_451662

00925njm 22002777a 4500 dc Saez, Jordi author Bar-Deroma, Raquel author Bogaert, Evelien author Cayez, Romain author Chow, Tom author Clark, Catharine author Garcia-Miguel, Julia author 2023-08-25T12:04:49Z 2023-08-25T12:04:49Z 2023-06-28 Reference standards; Commission on professional and hospital activities; Radiotherapy, Intensity-Modulated Estándares de referencia; Comisión sobre actividades profesionales y hospitalarias; Radioterapia de intensidad modulada Estàndards de referència; Comissió sobre activitats professionals i hospitalàries; Radioteràpia d'intensitat modulada Purpose: To demonstrate the feasibility of characterising MLCs and MLC models implemented in TPSs using a common set of dynamic beams. Materials and methods: 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. Results: 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. Conclusions: 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. http://hdl.handle.net/11351/10157 Normalització Auditoria Radioteràpia ANALYTICAL, DIAGNOSTIC AND THERAPEUTIC TECHNIQUES, AND EQUIPMENT::Investigative Techniques::Weights and Measures::Reference Standards HEALTH CARE::Health Services Administration::Quality of Health Care::Quality Assurance, Health Care::Clinical Audit::Medical Audit::Commission on Professional and Hospital Activities ANALYTICAL, DIAGNOSTIC AND THERAPEUTIC TECHNIQUES, AND EQUIPMENT::Therapeutics::Radiotherapy::Radiotherapy, Computer-Assisted::Radiotherapy, Conformal::Radiotherapy, Intensity-Modulated TÉCNICAS Y EQUIPOS ANALÍTICOS, DIAGNÓSTICOS Y TERAPÉUTICOS::técnicas de investigación::pesos y medidas::estándares de referencia ATENCIÓN DE SALUD::administración de los servicios de salud::calidad de la atención sanitaria::garantía de calidad de la atención sanitaria::auditoría clínica::auditoría médica::comisión sobre actividades profesionales y hospitalarias TÉCNICAS Y EQUIPOS ANALÍTICOS, DIAGNÓSTICOS Y TERAPÉUTICOS::terapéutica::radioterapia::radioterapia asistida por ordenador::radioterapia de conformación::radioterapia de intensidad modulada Universal evaluation of MLC models in treatment planning systems based on a common set of dynamic tests