| Computed tomography angiography of the carotid arteries at low kV settings: a prospective randomised trial assessing radiation dose and diagnostic confidence. | |
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MedLine Citation:
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PMID: 21710265 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVE: To assess radiation dose and diagnostic image quality of a low-dose (80 kV) versus a standard-dose (120 kV) protocol for computed tomography angiography (CTA) of the supra-aortic arteries. METHODS: 64-slice CTA of the supra-aortic arteries was performed in 42 consecutive patients using randomly either 80 or 120 kV at 300 absolute mAs. Intravascular attenuation values, contrast-to-noise (CNR) and signal-to-noise ratio (SNR) measurements were performed at three levels. Two readers assessed image quality by using a four-point scale. The effective dose (ED) was calculated to assess the differences in radiation exposure. RESULTS: Intravascular attenuation values at 80 kV were higher in the common carotid artery, the carotid bifurcation and the internal carotid artery (p < 0.001). CNR and SNR differed at the internal carotid artery, with higher values in the 80-kV group (p > 0.05). Both readers revealed a significantly better image quality at 120 kV only at the common carotid artery (p < 0.001; p = 0.007). Mean ED was significantly lower at 80-kV (1.23 ± 0.09 vs. 3.99 ± 0.33 mSv; p < 0.001). CONCLUSION: Tube voltage reduction to 80 kV in CTA of the supra-aortic arteries allows for significant radiation dose reduction but has limitations at the level of the common carotid artery. |
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Authors:
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Dietrich Beitzke; Florian Wolf; Gundula Edelhauser; Christina Plank; Rüdiger Schernthaner; Michael Weber; Richard Nolz; Johannes Lammer; Christian Loewe |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-28 |
Journal Detail:
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Title: European radiology Volume: - ISSN: 1432-1084 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-28 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9114774 Medline TA: Eur Radiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Division of Cardiovascular and Interventional Radiology, Medical University Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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