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Evaluation of multileaf collimator effect on the build-up dose region using different ionization chambers

2009-09Conference object Restricted access
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dc.contributor.authorZarza-Moreno, M.
dc.contributor.authorSouto, A. C.
dc.contributor.authorTeixeira, Nuno
dc.contributor.authorJesus, A. P.
dc.contributor.authorMora, G.
dc.date.accessioned2017-12-28T19:50:25Z
dc.date.available2017-12-28T19:50:25Z
dc.date.issued2009-09
dc.description.abstractIn the present work, we studied the effect of a multileaf collimator (MLC) on the build-up region. Ionization measurements (PDI) were performed in a water phantom for a 6 MV photon beam emerging from a Varian 2100C/D accelerator with a 120 – MILLENIUM MLC. We used two different detectors: a PTW 31002 cylindrical ionization chamber (IC) and a Roos parallel-plate chamber. Several MLC-JAWS configurations were investigated and the contribution of MLC for the build-up region was determined by comparing PDIs measured for MLC defined field sizes (from 2 x 2 to 10 x 10 cm2) and the corresponding PDIs measured for open fields. Our results were also compared with previous Monte Carlo (MC) simulated depth dose curves for the same experimental set-up [1].The Roos chamber measured dose values agree with MC values within 2% for all MLC openings and depths greater than 2 mm. We observed differences of about 4% between the values measured with cylindrical IC and previously calculated MC values. A negligible effect (less than 1%) of the MLC on the build-up dose was observed for all MLC defined field sizes. Our measurements cannot predict the MC calculated surface dose values.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationZarza-Moreno A, Souto AC, Teixeira N, Jesus AP, Mora G. Evaluation of multileaf collimator effect on the build-up dose region using different ionization chambers. In: Dössel O, Schlegel WC, editors. World Congress on Medical Physics and Biomedical Engineering, Munich (Germany), September 7-12, 2009. IFMBE Proceedings, vol. 25/1. Berlin: Springer; 2009. p. 1051-4.pt_PT
dc.identifier.doi10.1007/978-3-642-03474-9_295pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/7825
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Publishing Companypt_PT
dc.relation.publisherversionhttps://link.springer.com/chapter/10.1007/978-3-642-03474-9_295pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectBuild-up dosept_PT
dc.subjectSurface dosept_PT
dc.subjectMultileaf collimatorpt_PT
dc.subjectMonte Carlo simulationpt_PT
dc.subjectIonization chamberpt_PT
dc.titleEvaluation of multileaf collimator effect on the build-up dose region using different ionization chamberspt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.endPage1054pt_PT
oaire.citation.startPage1051pt_PT
oaire.citation.volume25/1pt_PT
rcaap.rightsrestrictedAccesspt_PT
rcaap.typeconferenceObjectpt_PT

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