M. Mkimel , M.R. Mesradi , R. El Baydaoui , Y. Toufique , Z. Aitelcadi , A. El Kharrim , A. Hilali
{"title":"Assessment of computed tomography dose index (CTDI) using the platform GEANT4/GATE","authors":"M. Mkimel , M.R. Mesradi , R. El Baydaoui , Y. Toufique , Z. Aitelcadi , A. El Kharrim , A. Hilali","doi":"10.1016/j.pisc.2019.100405","DOIUrl":null,"url":null,"abstract":"<div><p>Absorbed dose during a CT exam can be estimated by the computed tomography dose index (CTDI). The aim of this study is to validate a simulated CTDI with measured data for a 16-slice CT system. To measure the CTDI we have used an ion chamber, electrometer and two polymethylmethacrylate (PMMA) phantoms (head and body). GATE (GEANT4 Application for Tomographic Emission) platform is a Monte Carlo code for medical physics applications, especially dosimetry studies. CTDI and CTDI<sub>w</sub> were recorded to compare simulated results for different X-ray tube currents and voltages with experimental data at different positions in the phantom. The results obtained for all conditions applied show a difference less than 2.6% and 4.3% for head and body phantom, respectively. It was demonstrated that GATE is a good tool to simulate CTDI<sub>w</sub> values and to study of the influence of tube current and voltage on the absorbed dose.</p></div>","PeriodicalId":92112,"journal":{"name":"Perspectives in science","volume":"12 ","pages":"Article 100405"},"PeriodicalIF":0.0000,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pisc.2019.100405","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Perspectives in science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2213020919300126","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
Absorbed dose during a CT exam can be estimated by the computed tomography dose index (CTDI). The aim of this study is to validate a simulated CTDI with measured data for a 16-slice CT system. To measure the CTDI we have used an ion chamber, electrometer and two polymethylmethacrylate (PMMA) phantoms (head and body). GATE (GEANT4 Application for Tomographic Emission) platform is a Monte Carlo code for medical physics applications, especially dosimetry studies. CTDI and CTDIw were recorded to compare simulated results for different X-ray tube currents and voltages with experimental data at different positions in the phantom. The results obtained for all conditions applied show a difference less than 2.6% and 4.3% for head and body phantom, respectively. It was demonstrated that GATE is a good tool to simulate CTDIw values and to study of the influence of tube current and voltage on the absorbed dose.
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