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Article: Evaluation of radiation dose and image quality for the Varian cone beam computed tomography system

TitleEvaluation of radiation dose and image quality for the Varian cone beam computed tomography system
Authors
Issue Date2011
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/ijrobp
Citation
International Journal of Radiation Oncology - Biology - Physics, 2011, v. 80 n. 1, p. 291-300 How to Cite?
AbstractPurpose: To compare the image quality and dosimetry on the Varian cone beam computed tomography (CBCT) system between software Version 1.4.13 and Version 1.4.11 (referred to as "new" and "old" protocols, respectively, in the following text). This study investigated organ absorbed dose, total effective dose, and image quality of the CBCT system for the head-and-neck and pelvic regions. Methods and Materials: A calibrated Farmer chamber and two standard cylindrical Perspex CT dosimetry phantoms with diameter of 16 cm (head phantom) and 32 cm (body phantom) were used to measure the weighted cone-beam computed tomography dose index (CBCTDIw) of the Varian CBCT system. The absorbed dose of different organs was measured in a female anthropomorphic phantom with thermoluminescent dosimeters (TLD) and the total effective dose was estimated according to International Commission on Radiological Protection (ICRP) Publication 103. The dose measurement and image quality were studied for head-and-neck and pelvic regions, and comparison was made between the new and old protocols. Results: The values of the new CBCTDIw head-and-neck and pelvic protocols were 36.6 and 29.4 mGy, respectively. The total effective doses from the new head-and-neck and pelvic protocols were 1.7 and 8.2 mSv, respectively. The absorbed doses of lens for the new 200° and old 360° head-and-neck protocols were 3.8 and 59.4 mGy, respectively. The additional secondary cancer risk from daily CBCT might be up to 2.8%. Conclusions: The new Varian CBCT provided volumetric information for image guidance with acceptable image quality and lower radiation dose. This imaging tool gave a better standard for patient daily setup verification. © 2011 Elsevier Inc.
Persistent Identifierhttp://hdl.handle.net/10722/139117
ISSN
2015 Impact Factor: 4.495
2015 SCImago Journal Rankings: 2.274
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, HCYen_HK
dc.contributor.authorWu, VWCen_HK
dc.contributor.authorLiu, ESFen_HK
dc.contributor.authorKwong, DLWen_HK
dc.date.accessioned2011-09-23T05:45:11Z-
dc.date.available2011-09-23T05:45:11Z-
dc.date.issued2011en_HK
dc.identifier.citationInternational Journal of Radiation Oncology - Biology - Physics, 2011, v. 80 n. 1, p. 291-300en_HK
dc.identifier.issn0360-3016en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139117-
dc.description.abstractPurpose: To compare the image quality and dosimetry on the Varian cone beam computed tomography (CBCT) system between software Version 1.4.13 and Version 1.4.11 (referred to as "new" and "old" protocols, respectively, in the following text). This study investigated organ absorbed dose, total effective dose, and image quality of the CBCT system for the head-and-neck and pelvic regions. Methods and Materials: A calibrated Farmer chamber and two standard cylindrical Perspex CT dosimetry phantoms with diameter of 16 cm (head phantom) and 32 cm (body phantom) were used to measure the weighted cone-beam computed tomography dose index (CBCTDIw) of the Varian CBCT system. The absorbed dose of different organs was measured in a female anthropomorphic phantom with thermoluminescent dosimeters (TLD) and the total effective dose was estimated according to International Commission on Radiological Protection (ICRP) Publication 103. The dose measurement and image quality were studied for head-and-neck and pelvic regions, and comparison was made between the new and old protocols. Results: The values of the new CBCTDIw head-and-neck and pelvic protocols were 36.6 and 29.4 mGy, respectively. The total effective doses from the new head-and-neck and pelvic protocols were 1.7 and 8.2 mSv, respectively. The absorbed doses of lens for the new 200° and old 360° head-and-neck protocols were 3.8 and 59.4 mGy, respectively. The additional secondary cancer risk from daily CBCT might be up to 2.8%. Conclusions: The new Varian CBCT provided volumetric information for image guidance with acceptable image quality and lower radiation dose. This imaging tool gave a better standard for patient daily setup verification. © 2011 Elsevier Inc.en_HK
dc.languageengen_US
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/ijrobpen_HK
dc.relation.ispartofInternational Journal of Radiation Oncology - Biology - Physicsen_HK
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Radiation Oncology Biology Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Radiation Oncology Biology Physics, 2011, v. 80 n. 1, p. 291-300. DOI: 10.1016/j.ijrobp.2010.06.014-
dc.rights.uriCreative Commons: Attribution 3.0 Hong Kong License-
dc.subject.meshClinical Protocolsen_HK
dc.subject.meshCone-Beam Computed Tomography - methods - standardsen_HK
dc.subject.meshFemaleen_HK
dc.subject.meshHead - radiographyen_HK
dc.subject.meshHumansen_HK
dc.subject.meshNeck - radiographyen_HK
dc.subject.meshParticle Acceleratorsen_HK
dc.subject.meshPelvis - radiographyen_HK
dc.subject.meshPhantoms, Imagingen_HK
dc.subject.meshRadiotherapy Dosageen_HK
dc.subject.meshRadiotherapy, Computer-Assisted - instrumentation - methodsen_HK
dc.subject.meshSoftware Validationen_HK
dc.subject.meshThermoluminescent Dosimetry - instrumentation - methodsen_HK
dc.titleEvaluation of radiation dose and image quality for the Varian cone beam computed tomography systemen_HK
dc.typeArticleen_HK
dc.identifier.emailKwong, DLW:dlwkwong@hku.hken_HK
dc.identifier.authorityKwong, DLW=rp00414en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.ijrobp.2010.06.014en_HK
dc.identifier.pmid20932676-
dc.identifier.scopuseid_2-s2.0-79954418721en_HK
dc.identifier.hkuros194768en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79954418721&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume80en_HK
dc.identifier.issue1en_HK
dc.identifier.spage291en_HK
dc.identifier.epage300en_HK
dc.identifier.eissn1879-355X-
dc.identifier.isiWOS:000290006300040-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridCheng, HCY=36518476700en_HK
dc.identifier.scopusauthoridWu, VWC=7006045803en_HK
dc.identifier.scopusauthoridLiu, ESF=37119038000en_HK
dc.identifier.scopusauthoridKwong, DLW=15744231600en_HK
dc.identifier.citeulike7983959-

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