Dose reduction by automatic exposure control in multidetector computed tomography: comparison between measurement and calculation.
The aim of this study was to investigate the potential of dose reduction in multidetector computed tomography (MDCT) by current-modulated automatic exposure control (AEC) and to test the reliability of the dose estimation by the conventional CT dosimetry program CT-EXPO, when an average tube current...
| Publicado en: | European Radiology Vol. 19; no. 4; pp. 1027 - 1035 |
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| Autores principales: | , , , , , , , |
| Formato: | research Journal Article |
| Publicado: |
Springer Nature
Apr2009
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105220005&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105220005 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 09387994 NPH jtl: European Radiology issn: 09387994 maglogo: N pubinfo: dt: Apr2009 vid: 19 iid: 4 pid: 237 pub: Springer Nature place: New York, New York artinfo: ui: 105220005 36868297 NLM18987864 2010218177 10.1007/s00330-008-1204-6 NLM18987864 105220005 ppf: 1027 ppct: 8 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Dose reduction by automatic exposure control in multidetector computed tomography: comparison between measurement and calculation. aug: au: Lechel U Becker C Langenfeld-Jäger G Brix G Lechel, U Becker, C Langenfeld-Jäger, G Brix, G affil: Department of Medical Radiation Hygiene and Dosimetry, Federal Office for Radiation Protection, Neuherberg, Germany sug: subj: Tomography, X-Ray Computed Equipment and Supplies Tomography, X-Ray Computed Methods Algorithms Automation Body Burden Female Human Male Models, Theoretical Phantoms, Imaging Radiation Dosage Radiographic Image Interpretation, Computer-Assisted Radiometry Methods Radiotherapy, Computer-Assisted Radiation Monitoring Methods Female Male ab: The aim of this study was to investigate the potential of dose reduction in multidetector computed tomography (MDCT) by current-modulated automatic exposure control (AEC) and to test the reliability of the dose estimation by the conventional CT dosimetry program CT-EXPO, when an average tube current is used. Phantom measurements were performed at a CT system with 64 detector rows for four representative examination protocols, each without and with current-modulated AEC. Organ and effective doses were measured by thermoluminescence dosimeters (TLD) at an anthropomorphic Alderson phantom and compared with those given by the calculation with CT-EXPO. The application of AEC yielded dose reductions between 27 and 40% (TLD measurements). While good linearity was observed between measured and computed effective dose values both without and with AEC, the organ doses showed large deviations between measurement and calculation. The dose to patients undergoing a MDCT examination can be reduced considerably by applying a current-modulated AEC. Dosimetric algorithms using a constant current-time product provide reliable estimates of the effective dose. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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