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Assessment of Patient Dose Reduction by Bismuth Shielding in CT Using Measurements, GEANT4 and MCNPX Simulations

2015-07Journal article Open access
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dc.contributor.authorMendes, M
dc.contributor.authorCosta, F
dc.contributor.authorFigueira, C
dc.contributor.authorMadeira, P
dc.contributor.authorTeles, P
dc.contributor.authorVaz, P
dc.date.accessioned2018-08-06T15:04:40Z
dc.date.available2018-08-06T15:04:40Z
dc.date.issued2015-07
dc.description.abstractThis work reports on the use of two different Monte Carlo codes (GEANT4 and MCNPX) for assessing the dose reduction using bismuth shields in computer tomography (CT) procedures in order to protect radiosensitive organs such as eye lens, thyroid and breast. Measurements were performed using head and body PMMA phantoms and an ionisation chamber placed in five different positions of the phantom. Simulations were performed to estimate Computed Tomography Dose Index values using GEANT4 and MCNPX. The relative differences between measurements and simulations were <10 %. The dose reduction arising from the use of bismuth shielding ranges from 2 to 45 %, depending on the position of the bismuth shield. The percentage of dose reduction was more significant for the area covered by the bismuth shielding (36 % for eye lens, 39 % for thyroid and 45 % for breast shields).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRadiat Prot Dosimetry. 2015 Jul;165(1-4):175-81.pt_PT
dc.identifier.doi10.1093/rpd/ncv059pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.17/3011
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherOxford University Presspt_PT
dc.subjectAlgorithmspt_PT
dc.subjectBreastpt_PT
dc.subjectComputer Simulationpt_PT
dc.subjectComputerspt_PT
dc.subjectEquipment Designpt_PT
dc.subjectFemalept_PT
dc.subjectHumanspt_PT
dc.subjectLens, Crystallinept_PT
dc.subjectMonte Carlo Methodpt_PT
dc.subjectPhantoms, Imagingpt_PT
dc.subjectProtective Devicespt_PT
dc.subjectRadiation Dosagept_PT
dc.subjectRadiation Protectionpt_PT
dc.subjectReproducibility of Resultspt_PT
dc.subjectThyroid Glandpt_PT
dc.subjectTomography Scanners, X-Ray Computedpt_PT
dc.subjectTomography, X-Ray Computedpt_PT
dc.subjectBismuthpt_PT
dc.subjectHSJ IMApt_PT
dc.titleAssessment of Patient Dose Reduction by Bismuth Shielding in CT Using Measurements, GEANT4 and MCNPX Simulationspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage181pt_PT
oaire.citation.issue1-4pt_PT
oaire.citation.startPage175pt_PT
oaire.citation.titleRadiation Protection Dosimetrypt_PT
oaire.citation.volume165pt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT

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