Please use this identifier to cite or link to this item: http://hdl.handle.net/11434/280
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dc.contributor.authorKenny, Johnen
dc.contributor.otherDunn, Leonen
dc.contributor.otherLehmann, Joergen
dc.contributor.otherKron, Tomasen
dc.contributor.otherAlves, Andrewen
dc.contributor.otherCole, Andrewen
dc.contributor.otherZifodya, Jacksonen
dc.contributor.otherWilliams, Ivanen
dc.date2015-04en
dc.date.accessioned2015-07-20T22:48:41Zen
dc.date.available2015-07-20T22:48:41Zen
dc.date.issued2015-04en
dc.identifier.citationPhysica Medica 2015; 31: 435-441en
dc.identifier.issn1120-1797en
dc.identifier.urihttp://hdl.handle.net/11434/280en
dc.description.abstractThis work presents the Australian Clinical Dosimetry Service's (ACDS) findings of an investigation of systematic discrepancies between treatment planning system (TPS) calculated and measured audit doses. Specifically, a comparison between the Anisotropic Analytic Algorithm (AAA) and other common dose-calculation algorithms in regions downstream (Math Eq) from low-density material in anthropomorphic and slab phantom geometries is presented. Two measurement setups involving rectilinear slab-phantoms (ACDS Level II audit) and anthropomorphic geometries (ACDS Level III audit) were used in conjunction with ion chamber (planar 2D array and Farmer-type) measurements. Measured doses were compared to calculated doses for a variety of cases, with and without the presence of inhomogeneities and beam-modifiers in 71 audits. Results demonstrate a systematic AAA underdose with an average discrepancy of 2.9 ± 1.2% when the AAA algorithm is implemented in regions distal from lung-tissue interfaces, when lateral beams are used with anthropomorphic phantoms. This systemic discrepancy was found for all Level III audits of facilities using the AAA algorithm. This discrepancy is not seen when identical measurements are compared for other common dose-calculation algorithms (average discrepancy −0.4 ± 1.7%), including the Acuros XB algorithm also available with the Eclipse TPS. For slab phantom geometries (Level II audits), with similar measurement points downstream from inhomogeneities this discrepancy is also not seen.en
dc.publisherElsevieren
dc.subjectEpworth Radiation Oncologyen
dc.subjectDosimetry, Radiationen
dc.subjectRadiation Dosimetryen
dc.subjectDosimetry Calculations, Computer-Assisteden
dc.subjectRadiotherapy Planning, Computer-Assisteden
dc.subjectRadiotherapy Dose Fractionationen
dc.subjectAlgorithmsen
dc.subjectRadiotherapyen
dc.subjectAnisotropic Analytic Algorithm (AAA)en
dc.subjectAustralian Clinical Dosimetry Service (ACDS)en
dc.subjectTreatment Planning Systemen
dc.subjectTPSen
dc.titleNational dosimetric audit network finds discrepancies in AAA lung inhomogeneity corrections.en
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.ejmp.2015.04.002en
dc.identifier.journaltitlePhysica Medicaen
dc.description.pubmedurihttp://www.ncbi.nlm.nih.gov/pubmed/25921329en
dc.description.affiliatesAustralian Clinical Dosimetry Service, Yallambie, Victoria, Australiaen
dc.description.affiliatesInstitute of Medical Physics, University of Sydney, Sydney, Australiaen
dc.description.affiliatesAustralian Radiation Protection and Nuclear Safety Agency, Yallambie, Victoria, Australiaen
dc.description.affiliatesSchool of Applied Science, RMIT University, Melbourne, Victoria, Australiaen
dc.description.affiliatesPeter MacCallum Cancer Centre, Melbourne, Victoria, Australiaen
dc.description.affiliatesNorth West Cancer Centre, Tamworth Hospital, Tamworth, NSW, Australiaen
dc.type.studyortrialDescriptive Studyen
dc.type.contenttypeTexten
Appears in Collections:Radiation Oncology

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