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Monte Carlo simulation of the Varian Clinac 600C accelerator dynamic and physical wedges

2007Journal article Open access
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dc.contributor.authorSoares, S.
dc.contributor.authorChaves, A
dc.contributor.authorPeralta, L
dc.contributor.authorLopes, M. C.
dc.date.accessioned2020-02-12T10:55:09Z
dc.date.available2020-02-12T10:55:09Z
dc.date.issued2007
dc.description.abstractThe present paper describes the study done on the dosimetric characteristics of the Varian Clinac 600C dynamic wedges (DW) and their comparison with the physical wedges (PW) in terms of the differences affecting the dose distributions, beam spectra, energy fluence and angular distributions. The geometry of the 4 MV photon beam and the dose distributions in a water phantom were simulated with GEANT3 and DPM Monte Carlo code systems. The DW was modelled through the constant movement of the upper jaws. The depth dose distributions and lateral profiles for the DW, PW and open fields were measured and compared with the Monte Carlo simulations and the global agreement was found to be within 3%. It was also found that the effects of a DW on beam spectral and angular distributions are much less significant than those produced by a PW. For example, in our study we found out that the 450PW, when compared with the corresponding open field, can introduce a 30% increase in the mean photon energy due to the beam hardening effect and that it can also introduce a 4.5% dose reduction in the build-up region because of the reduction of the contaminated electrons by the PW. For the DW neither this mean-energy increase nor such dose reduction was found. The PW, when compared to the DW, significantly alters the photon-beam spectrum and these dosimetric differences are significant and further investigation must be performed to quantify the impact in clinical use of these beams.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1088/1742-6596/74/1/021015pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/9227
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectMonte Carlopt_PT
dc.subjectGeant 3pt_PT
dc.subjectDinamic Wedgespt_PT
dc.subjectVarian Clinac 600Cpt_PT
dc.titleMonte Carlo simulation of the Varian Clinac 600C accelerator dynamic and physical wedgespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage021015pt_PT
oaire.citation.titleJournal of Physics: Conference Seriespt_PT
oaire.citation.volume74pt_PT
person.familyNameda Costa Henriques Soares
person.givenNameSandra
person.identifier.ciencia-idAB16-BE9D-0BA5
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication3400a4b0-8998-4d48-8a94-7d9feba4d3cf
relation.isAuthorOfPublication.latestForDiscovery3400a4b0-8998-4d48-8a94-7d9feba4d3cf

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