Εμφάνιση απλής εγγραφής

dc.creatorStathakis, S.en
dc.creatorKappas, C.en
dc.creatorTheodorou, K.en
dc.creatorPapanikolaou, N.en
dc.creatorRosenwald, J. C.en
dc.date.accessioned2015-11-23T10:48:38Z
dc.date.available2015-11-23T10:48:38Z
dc.date.issued2006
dc.identifier10.1120/jacmp.2027.25366
dc.identifier.issn15269914
dc.identifier.urihttp://hdl.handle.net/11615/33382
dc.description.abstractA number of treatment-planning systems still use conventional correction methods for body inhomogeneities. Most of these methods (power law method, tissue-air ratio (TAR), etc.) consider only on-axis points, rectangular fields, and inhomogeneous slabs covering the whole irradiating field. A new method is proposed that overcomes the above limitations. The new method uses the principle of the Clarkson method on sector integration to take into account the position and lateral extent of the inhomogeneity with respect to the point of calculation, as well as the shape of the irradiating field. The field is divided into angular sectors, and each sector is then treated separately for the presence of inhomogeneities using a conventional correction method. Applying this method, we can predict the correction factors for Co-60 and 6-MV photon beams for irregular fields that include inhomogeneities of lower or higher densities relative to water. Validation of the predicted corrections factors was made against Monte Carlo calculations for the same geometries. The agreement between the predicted correction factors and the Monte Carlo calculations was within 1.5%. In addition, the new method was able to predict the behavior of the correction factor when the point of calculation was approaching or moving away from the interface between two materials. © 2006 Am. Coll. Med. Phys.en
dc.sourceJournal of Applied Clinical Medical Physicsen
dc.source.urihttp://www.scopus.com/inward/record.url?eid=2-s2.0-33645421370&partnerID=40&md5=b7b797b0ee43ac582a2b871f9aaa3d91
dc.subjectInhomogeneity correctionen
dc.subjectPhotonsen
dc.subjectRadiation therapyen
dc.subjectalgorithmen
dc.subjectarticleen
dc.subjectartifacten
dc.subjectbiological modelen
dc.subjectcomputer assisted radiotherapyen
dc.subjectcomputer simulationen
dc.subjecthumanen
dc.subjectmegavoltage radiotherapyen
dc.subjectmethodologyen
dc.subjectphotonen
dc.subjectradiation doseen
dc.subjectradiation scatteringen
dc.subjectradiometryen
dc.subjectthree dimensional imagingen
dc.subjectAlgorithmsen
dc.subjectArtifactsen
dc.subjectHumansen
dc.subjectImaging, Three-Dimensionalen
dc.subjectModels, Biologicalen
dc.subjectRadiotherapy Dosageen
dc.subjectRadiotherapy Planning, Computer-Assisteden
dc.subjectRadiotherapy, High-Energyen
dc.subjectScattering, Radiationen
dc.titleAn inhomogeneity correction algorithm for irregular fields of high-energy photon beams based on Clarkson integration and the 3D beam subtraction methoden
dc.typejournalArticleen


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