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Evaluation of QA software system analysis for the static picket fence test.
Boudet, Julien; Aubignac, Léone; Beneux, Amandine; Mazoyer, Frédéric; Bessieres, Igor.
Afiliación
  • Boudet J; Department of Physics, Centre Georges François Leclerc, Dijon, France.
  • Aubignac L; Department of Physics, Centre Georges François Leclerc, Dijon, France.
  • Beneux A; Department of Physics, Hospices Civils de Lyon, Pierre Bénite, France.
  • Mazoyer F; Department of Radiotherapy, Centre Hospitalier Annecy Genevois, Epagny Metz-Tessy, France.
  • Bessieres I; Department of Physics, Centre Georges François Leclerc, Dijon, France.
J Appl Clin Med Phys ; 23(7): e13618, 2022 Jul.
Article en En | MEDLINE | ID: mdl-35570379
Intensity modulation treatments are widely used in radiotherapy because of many known advantages. In this context, the picket fence test (PF) is a relevant test to check the Multileaf Collimator (MLC) performances. So this work compares and evaluates three analysis platforms for the PF used routinely by three different institutions. This study covers two linear accelerators (Linac) with two MLC types, a Millenium 120 MLC and Millenium 120 High Definition MLC respectively on a Varian Truebeam and Truebeam STx. Both linacs include an As 1200 portal imager (EPID). From a reference PF plan, MLC errors have been introduced to modify the slits in position or width (shifts from 0.1 to 0.5 mm on one or both banks). Then errors have been defined on the EPID to investigate detection system deviations (signal sensitivity and position variations). Finally, 110 DICOM-RT images have been generated and analyzed by each software system. All software systems have shown good performances to quantify the position errors, even though the leaf pair identifications can be wrong in some cases regarding the analysis method considered. The slit width measurement (not calculated by all software systems) has shown good sensitivity, but some quantification difficulties have been highlighted regardless of the analysis method used. Linked to the expected accuracy of the PF test, the imager variations have demonstrated considerable influence in the results. Differences in the results and the analysis methods have been pointed out for each software system. The results can be helpful to optimize the settings of each analysis software system depending on expectations and treatment modalities of each institution.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oncología por Radiación / Radioterapia de Intensidad Modulada Límite: Humans Idioma: En Revista: J Appl Clin Med Phys Asunto de la revista: BIOFISICA Año: 2022 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oncología por Radiación / Radioterapia de Intensidad Modulada Límite: Humans Idioma: En Revista: J Appl Clin Med Phys Asunto de la revista: BIOFISICA Año: 2022 Tipo del documento: Article País de afiliación: Francia Pais de publicación: Estados Unidos