Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system

Detalhes bibliográficos
Autor(a) principal: FONTES, LADYJANE P.
Data de Publicação: 2018
Outros Autores: POTIENS, MARIA da P.A., INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
Tipo de documento: Artigo de conferência
Título da fonte: Repositório Institucional do IPEN
Texto Completo: http://repositorio.ipen.br/handle/123456789/28232
Resumo: The pencil-type ionization chamber widely used in computed tomography (CT) dosimetry, is a measuring instrument that has a cylindrical shape and provides uniform response independent of the angle of incidence of ionizing radiation. Calibration and measurements performed with the pencil-type ionization chamber are done in terms of Kerma product in air-length (Pk,l) and values are given in Gy.cm. To obtain the values of (Pk,l) during clinical measurements, the readings performed with the ionization chamber are multiplied by the calibration coefficient (Nk,l) and the correction factor C for quality (Kq) which are given in Calibration certificates of the chambers. The application of the correction factor for radiation quality Kq is done as a function of the effective energy of the beam that is determined by the Half Value layer (HVL) calculation. In order to estimate the HVL values in this work, a Tandem system made up of cylindrical aluminum and PMMA absorber layers was used as a low cost and easy to apply method. From the Tandem curve, it was possible to construct the calibration curve and obtain the appropriate Kq to the beam of the computed tomography equipment studied.
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spelling 2018-01-08T10:37:00Z2018-01-08T10:37:00ZOctober 22-27, 2017http://repositorio.ipen.br/handle/123456789/28232The pencil-type ionization chamber widely used in computed tomography (CT) dosimetry, is a measuring instrument that has a cylindrical shape and provides uniform response independent of the angle of incidence of ionizing radiation. Calibration and measurements performed with the pencil-type ionization chamber are done in terms of Kerma product in air-length (Pk,l) and values are given in Gy.cm. To obtain the values of (Pk,l) during clinical measurements, the readings performed with the ionization chamber are multiplied by the calibration coefficient (Nk,l) and the correction factor C for quality (Kq) which are given in Calibration certificates of the chambers. The application of the correction factor for radiation quality Kq is done as a function of the effective energy of the beam that is determined by the Half Value layer (HVL) calculation. In order to estimate the HVL values in this work, a Tandem system made up of cylindrical aluminum and PMMA absorber layers was used as a low cost and easy to apply method. From the Tandem curve, it was possible to construct the calibration curve and obtain the appropriate Kq to the beam of the computed tomography equipment studied.Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2018-01-08T10:37:00Z No. of bitstreams: 1 24057.pdf: 428620 bytes, checksum: 55ea165730c2032d323e81bccb6a3910 (MD5)Made available in DSpace on 2018-01-08T10:37:00Z (GMT). No. of bitstreams: 1 24057.pdf: 428620 bytes, checksum: 55ea165730c2032d323e81bccb6a3910 (MD5)Associa????o Brasileira de Energia Nuclearcalibrationcomputerized tomographycorrectionsdosimetryionization chamberskermalayerspmmaquality assuranceApplication of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem systeminfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectINACIRio de Janeiro, RJBelo Horizonte, MGFONTES, LADYJANE P.POTIENS, MARIA da P.A.INTERNATIONAL NUCLEAR ATLANTIC CONFERENCEinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional do IPENinstname:Instituto de Pesquisas Energéticas e Nucleares (IPEN)instacron:IPEN240572017FONTES, LADYJANE P.POTIENS, MARIA da P.A.18-01Proceedings12137FONTES, LADYJANE P.:12137:330:SPOTIENS, MARIA DA P.A.:346:330:NORIGINAL24057.pdf24057.pdfapplication/pdf428620http://repositorio.ipen.br/bitstream/123456789/28232/1/24057.pdf55ea165730c2032d323e81bccb6a3910MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://repositorio.ipen.br/bitstream/123456789/28232/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52123456789/282322022-03-25 14:02:38.871oai:repositorio.ipen.br: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Repositório InstitucionalPUBhttp://repositorio.ipen.br/oai/requestbibl@ipen.bropendoar:45102022-03-25T14:02:38Repositório Institucional do IPEN - Instituto de Pesquisas Energéticas e Nucleares (IPEN)false
dc.title.pt_BR.fl_str_mv Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
title Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
spellingShingle Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
FONTES, LADYJANE P.
calibration
computerized tomography
corrections
dosimetry
ionization chambers
kerma
layers
pmma
quality assurance
title_short Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
title_full Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
title_fullStr Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
title_full_unstemmed Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
title_sort Application of the correction factor for radiation quality Kq in dosimetry with pencil-type ionization chambers using a tandem system
author FONTES, LADYJANE P.
author_facet FONTES, LADYJANE P.
POTIENS, MARIA da P.A.
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
author_role author
author2 POTIENS, MARIA da P.A.
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
author2_role author
author
dc.contributor.author.fl_str_mv FONTES, LADYJANE P.
POTIENS, MARIA da P.A.
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
dc.subject.por.fl_str_mv calibration
computerized tomography
corrections
dosimetry
ionization chambers
kerma
layers
pmma
quality assurance
topic calibration
computerized tomography
corrections
dosimetry
ionization chambers
kerma
layers
pmma
quality assurance
description The pencil-type ionization chamber widely used in computed tomography (CT) dosimetry, is a measuring instrument that has a cylindrical shape and provides uniform response independent of the angle of incidence of ionizing radiation. Calibration and measurements performed with the pencil-type ionization chamber are done in terms of Kerma product in air-length (Pk,l) and values are given in Gy.cm. To obtain the values of (Pk,l) during clinical measurements, the readings performed with the ionization chamber are multiplied by the calibration coefficient (Nk,l) and the correction factor C for quality (Kq) which are given in Calibration certificates of the chambers. The application of the correction factor for radiation quality Kq is done as a function of the effective energy of the beam that is determined by the Half Value layer (HVL) calculation. In order to estimate the HVL values in this work, a Tandem system made up of cylindrical aluminum and PMMA absorber layers was used as a low cost and easy to apply method. From the Tandem curve, it was possible to construct the calibration curve and obtain the appropriate Kq to the beam of the computed tomography equipment studied.
publishDate 2018
dc.date.evento.pt_BR.fl_str_mv October 22-27, 2017
dc.date.accessioned.fl_str_mv 2018-01-08T10:37:00Z
dc.date.available.fl_str_mv 2018-01-08T10:37:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/conferenceObject
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://repositorio.ipen.br/handle/123456789/28232
url http://repositorio.ipen.br/handle/123456789/28232
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.coverage.pt_BR.fl_str_mv I
dc.publisher.none.fl_str_mv Associa????o Brasileira de Energia Nuclear
publisher.none.fl_str_mv Associa????o Brasileira de Energia Nuclear
dc.source.none.fl_str_mv reponame:Repositório Institucional do IPEN
instname:Instituto de Pesquisas Energéticas e Nucleares (IPEN)
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instname_str Instituto de Pesquisas Energéticas e Nucleares (IPEN)
instacron_str IPEN
institution IPEN
reponame_str Repositório Institucional do IPEN
collection Repositório Institucional do IPEN
bitstream.url.fl_str_mv http://repositorio.ipen.br/bitstream/123456789/28232/1/24057.pdf
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