| Assessment of radiation exposure on a dual-source computed tomography-scanner performing coronary computed tomography-angiography. | |
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MedLine Citation:
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PMID: 19608362 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The radiation exposure of a dual-source-64-channel multi-detector-computed-tomography-scanner (Somatom-Defintion, Siemens, Germany) was assessed in a phantom-study performing coronary-CT-angiography (CTCA) in comparison to patients' data randomly selected from routine scanning. METHODS: 240 CT-acquisitions of a computed tomography dose index (CTDI)-phantom (PTW, Freiburg, Germany) were performed using a synthetically generated Electrocardiography (ECG)-signal with variable heart rates (30-180 beats per minute (bpm)). 120 measurements were acquired using continuous tube-output; 120 measurements were performed using ECG-synchronized tube-modulation. The pulsing window was set at minimum duration at 65% of the cardiac cycle between 30 and 75 bpm. From 90-180 bpm the pulsing window was set at 30-70% of the cardiac cycle. Automated pitch adaptation was always used. A comparison between phantom CTDI and two patient groups' CTDI corresponding to the two pulsing groups was performed. RESULTS: Without ECG-tube-modulation CDTI-values were affected by heart-rate-changes resulting in 85.7 mGray (mGy) at 30 and 45 bpm, 65.5 mGy/60 bpm, 54.7 mGy/75 bpm, 46.5 mGy/90 bpm, 34.2 mGy/120 bpm, 27.0 mGy/150 bpm and 22.1 mGy/180 bpm equal to effective doses between 14.5 mSievert (mSv) at 30/45 bpm and 3.6 mSv at 180 bpm. Using ECG-tube-modulation these CTDI-values resulted: 32.6 mGy/30 bpm, 36.6 mGy/45 bpm, 31.4 mGy/60 bpm, 26.8 mGy/75 bpm, 23.7 mGy/90 bpm, 19.4 mGy/120 bpm, 17.2 mGy/150 bpm and 15.6 mGy/180 bpm equal to effective doses between 5.5 mSv at 30 bpm and 2.6 mSv at 180 bpm. Significant CTDI-differences were found between patients with lower/moderate and higher heart rates in comparison to the phantom CTDI-results. CONCLUSIONS: Dual source CTCA is particularly dose efficient at high heart rates when automated pitch adaptation, especially in combination with ECG-based tube-modulation is used. However in clinical routine scanning for patients with higher heart rates and corresponding enlarged pulsing window a significant different dose resulted. |
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Authors:
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S Kirchhoff; P Herzog; T Johnson; H Böhm; K Nikolaou; M F Reiser; C H Becker |
Publication Detail:
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Type: Journal Article Date: 2009-07-16 |
Journal Detail:
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Title: European journal of radiology Volume: 74 ISSN: 1872-7727 ISO Abbreviation: Eur J Radiol Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-08-05 Completed Date: 2011-01-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8106411 Medline TA: Eur J Radiol Country: Ireland |
Other Details:
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Languages: eng Pagination: e181-5 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2009 Elsevier Ireland Ltd. All rights reserved. |
Affiliation:
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Institute of Clinical Radiology, University Hospital Munich - Grosshadern, Ludwig Maximilians-Universität München, Klinikum Grosshadern, Marchioninistrasse 15, 81377 Munich, Germany. sonja.kirchhoff@med.uni-muenchen.de |
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| MeSH Terms | |
Descriptor/Qualifier:
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Body Burden* Coronary Angiography / instrumentation* Equipment Design Equipment Failure Analysis Humans Phantoms, Imaging Radiation Dosage* Radiography, Dual-Energy Scanned Projection / instrumentation* Radiometry / methods* Tomography, X-Ray Computed / instrumentation* |
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