Air kerma area product in cone beam computed tomography
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFBA |
Texto Completo: | http://repositorio.ufba.br/ri/handle/ri/23181 |
Resumo: | Abstract Objective: to evaluate the influence of FOV in air kerma-area product (KAP) and the constancy of exposure parameters on cone beam computed tomography equipments. Methodology: Two cone beam CT (GENDEX CBX 500 and i-CAT Classic) were used and seven exposures with the following FOVs were performed: (A) 14cm x 8,5cm, (B) 14cm x 6cm, (C) 8,5cm x 8.5cm e (D) 8,5cm x 6cm, for CBX 500; and (E) 14cm x 6.cm, (F) 14cm x 8cm e (G) 14cm x 13cm, for the i-CAT. The technical exposure factors (kV, mA, mAs and voxel), remained constant. The dosimetric evaluation was performed with air KAP meter manufactured by IBA dosimetry, model kerma X plus TinO, positioned at the output of the X-ray beam. To evaluate the constancy of the exposure parameters a semiconductor (Radcal, Rapidose) fixed in front of the tomography image receptor was used. Result: The KAP values obtained ranged between 360.1 mGy.cm² and 1031.2 mGy.cm². The FOV height had a substantial influence on the radiation dose. Repeatability and accuracy of the tube voltage varied less than 10%. Conclusion: The radiation dose is directly related to the height and inversely related with the FOV diameter; even within the recommended limits, the percentage variation of repeatability and accuracy of kV, for the tomography equipments tested, points to the regular equipment calibration, in order to reduce radiation dose to the patient to a minimum. Keywords: Cone beam computed tomography. Radiation. Dosimetry. |
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Oliveira, Marcus Vinicius Linhares deBatista, Wilson Otto GomesSoares, Maria RosângelaCampos, Paulo Sergio Flores2017-06-20T13:30:04Z2017-06-20T13:30:04Z2014-09Rev. Ciênc. Méd. Biol., Salvador, v. 13, n. 3 – especial, p. 309-312, set./dez. 2014.2236-5222http://repositorio.ufba.br/ri/handle/ri/23181v.13, n.3Abstract Objective: to evaluate the influence of FOV in air kerma-area product (KAP) and the constancy of exposure parameters on cone beam computed tomography equipments. Methodology: Two cone beam CT (GENDEX CBX 500 and i-CAT Classic) were used and seven exposures with the following FOVs were performed: (A) 14cm x 8,5cm, (B) 14cm x 6cm, (C) 8,5cm x 8.5cm e (D) 8,5cm x 6cm, for CBX 500; and (E) 14cm x 6.cm, (F) 14cm x 8cm e (G) 14cm x 13cm, for the i-CAT. The technical exposure factors (kV, mA, mAs and voxel), remained constant. The dosimetric evaluation was performed with air KAP meter manufactured by IBA dosimetry, model kerma X plus TinO, positioned at the output of the X-ray beam. To evaluate the constancy of the exposure parameters a semiconductor (Radcal, Rapidose) fixed in front of the tomography image receptor was used. Result: The KAP values obtained ranged between 360.1 mGy.cm² and 1031.2 mGy.cm². The FOV height had a substantial influence on the radiation dose. Repeatability and accuracy of the tube voltage varied less than 10%. Conclusion: The radiation dose is directly related to the height and inversely related with the FOV diameter; even within the recommended limits, the percentage variation of repeatability and accuracy of kV, for the tomography equipments tested, points to the regular equipment calibration, in order to reduce radiation dose to the patient to a minimum. Keywords: Cone beam computed tomography. Radiation. Dosimetry.Objetivo: avaliar a influência do FOV no produto kerma-área (PKA) no ar e a constância dos parâmetros de exposição em equipamentos de tomografia computadorizada feixe cônico. Metodologia: Foram utilizados dois tomógrafos de feixe cônico (GENDEX CBX 500 e i-CAT Classic) e foram realizadas sete exposições com os seguintes FOVs: (A) 14cm x 8,5cm, (B) 14cm x 6cm, (C) 8,5cm x 8.5cm e (D) 8,5cm x 6cm, para o CBX 500; e (E) 14cm x 6.cm, (F) 14cm x 8cm e (G) 14cm x 13cm, para o i-CAT. Os fatores técnicos de exposição (kV, mA, mAs e voxel), permaneceram constantes. A avaliação dosimétrica foi realizada com um medidor do produto kerma-área no ar fabricado pela IBA dosimetry, modelo kerma X plus TinO, posicionado na saída do feixe de raios X. Para a avaliação da constância dos parâmetros de exposição foi utilizado um multimedidor do tipo semicondutor, Radcal, modelo Rapidose fixado na entrada do receptor de imagem do tomógrafo. Resultados: Os valores de PKA obtidos variaram entre 360,1 mGy.cm² e 1.031,2 mGy.cm². A altura do FOV teve influência substantiva na dose de radiação. A repetibilidade e exatidão da tensão do tubo variaram abaixo dos 10%. Conclusões: a dose de radiação tem relação direta com a altura e inversa com o diâmetro do FOV; embora dentro das margens recomendadas, a variação dos percentuais de repetibilidade e exatidão do kV, para os tomógrafos testados, aponta para a calibragem periódica dos equipamentos, com vistas a reduzir ao mínimo necessário a dose de radiação para o paciente.Submitted by ROBERTO PAULO CORREIA DE ARAÚJO (ppgorgsistem@ufba.br) on 2017-06-20T13:30:04Z No. of bitstreams: 1 8_v.13_3.pdf: 667079 bytes, checksum: 4bb9cc9e39591f313692aa5eb8347146 (MD5)Made available in DSpace on 2017-06-20T13:30:04Z (GMT). No. of bitstreams: 1 8_v.13_3.pdf: 667079 bytes, checksum: 4bb9cc9e39591f313692aa5eb8347146 (MD5) Previous issue date: 2014-09SalvadorInstituto de Ciências da Saúde/ Universidade Federal da BahiaBrasilhttp://www.portalseer.ufba.br/index.php/cmbio/article/view/12936/9339reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBATomografia Computadorizada de Feixe Cônico.Radiação.Dosimetria.Air kerma area product in cone beam computed tomographyRevista de Ciências Médicas e Biológicasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessporORIGINAL8_v.13_3.pdf8_v.13_3.pdfapplication/pdf667079https://repositorio.ufba.br/bitstream/ri/23181/1/8_v.13_3.pdf4bb9cc9e39591f313692aa5eb8347146MD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/23181/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXT8_v.13_3.pdf.txt8_v.13_3.pdf.txtExtracted texttext/plain15238https://repositorio.ufba.br/bitstream/ri/23181/3/8_v.13_3.pdf.txtf57208fc30f418ec9b877ac8ff2aca7dMD53ri/231812022-03-10 14:40:48.813oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-03-10T17:40:48Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false |
dc.title.pt_BR.fl_str_mv |
Air kerma area product in cone beam computed tomography |
dc.title.alternative.pt_BR.fl_str_mv |
Revista de Ciências Médicas e Biológicas |
title |
Air kerma area product in cone beam computed tomography |
spellingShingle |
Air kerma area product in cone beam computed tomography Oliveira, Marcus Vinicius Linhares de Tomografia Computadorizada de Feixe Cônico. Radiação. Dosimetria. |
title_short |
Air kerma area product in cone beam computed tomography |
title_full |
Air kerma area product in cone beam computed tomography |
title_fullStr |
Air kerma area product in cone beam computed tomography |
title_full_unstemmed |
Air kerma area product in cone beam computed tomography |
title_sort |
Air kerma area product in cone beam computed tomography |
author |
Oliveira, Marcus Vinicius Linhares de |
author_facet |
Oliveira, Marcus Vinicius Linhares de Batista, Wilson Otto Gomes Soares, Maria Rosângela Campos, Paulo Sergio Flores |
author_role |
author |
author2 |
Batista, Wilson Otto Gomes Soares, Maria Rosângela Campos, Paulo Sergio Flores |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Oliveira, Marcus Vinicius Linhares de Batista, Wilson Otto Gomes Soares, Maria Rosângela Campos, Paulo Sergio Flores |
dc.subject.por.fl_str_mv |
Tomografia Computadorizada de Feixe Cônico. Radiação. Dosimetria. |
topic |
Tomografia Computadorizada de Feixe Cônico. Radiação. Dosimetria. |
description |
Abstract Objective: to evaluate the influence of FOV in air kerma-area product (KAP) and the constancy of exposure parameters on cone beam computed tomography equipments. Methodology: Two cone beam CT (GENDEX CBX 500 and i-CAT Classic) were used and seven exposures with the following FOVs were performed: (A) 14cm x 8,5cm, (B) 14cm x 6cm, (C) 8,5cm x 8.5cm e (D) 8,5cm x 6cm, for CBX 500; and (E) 14cm x 6.cm, (F) 14cm x 8cm e (G) 14cm x 13cm, for the i-CAT. The technical exposure factors (kV, mA, mAs and voxel), remained constant. The dosimetric evaluation was performed with air KAP meter manufactured by IBA dosimetry, model kerma X plus TinO, positioned at the output of the X-ray beam. To evaluate the constancy of the exposure parameters a semiconductor (Radcal, Rapidose) fixed in front of the tomography image receptor was used. Result: The KAP values obtained ranged between 360.1 mGy.cm² and 1031.2 mGy.cm². The FOV height had a substantial influence on the radiation dose. Repeatability and accuracy of the tube voltage varied less than 10%. Conclusion: The radiation dose is directly related to the height and inversely related with the FOV diameter; even within the recommended limits, the percentage variation of repeatability and accuracy of kV, for the tomography equipments tested, points to the regular equipment calibration, in order to reduce radiation dose to the patient to a minimum. Keywords: Cone beam computed tomography. Radiation. Dosimetry. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014-09 |
dc.date.accessioned.fl_str_mv |
2017-06-20T13:30:04Z |
dc.date.available.fl_str_mv |
2017-06-20T13:30:04Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
Rev. Ciênc. Méd. Biol., Salvador, v. 13, n. 3 – especial, p. 309-312, set./dez. 2014. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufba.br/ri/handle/ri/23181 |
dc.identifier.issn.none.fl_str_mv |
2236-5222 |
dc.identifier.number.pt_BR.fl_str_mv |
v.13, n.3 |
identifier_str_mv |
Rev. Ciênc. Méd. Biol., Salvador, v. 13, n. 3 – especial, p. 309-312, set./dez. 2014. 2236-5222 v.13, n.3 |
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http://repositorio.ufba.br/ri/handle/ri/23181 |
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por |
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Instituto de Ciências da Saúde/ Universidade Federal da Bahia |
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Brasil |
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Instituto de Ciências da Saúde/ Universidade Federal da Bahia |
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http://www.portalseer.ufba.br/index.php/cmbio/article/view/12936/9339 |
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