| Assessment of flow instabilities in the healthy aorta using flow-sensitive MRI. | |
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MedLine Citation:
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PMID: 21448948 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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PURPOSE: To assess blood flow velocities and spatial distribution of aortic Reynolds numbers in vivo using flow-sensitive magnetic resonance imaging (MRI) and probe for flow instabilities along the aorta based on an empirical model for physiological pulsatile blood flow. MATERIALS AND METHODS: Thirty young healthy volunteers were examined by flow-sensitive MRI at eight imaging planes distributed along the thoracic aorta. Flow, Womersley, Strouhal, Reynolds, and critical Reynolds numbers were calculated and used to assess the presence of flow instabilities. RESULTS: The average peak Reynolds number was higher in the ascending (≈4500) and descending aorta (≈4200) than in the aortic arch (≈3400). According to the calculated critical Reynolds numbers, flow instabilities were prominent in the ascending (14/30 volunteers) and descending aorta (22/30 volunteers) but not in the aortic arch (3/30 volunteers). A significant difference (P < 0.05) in supracritical peak Reynolds numbers was observed between genders. The supracritical Reynolds number, indicating flow instabilities, significantly correlated (P < 0.05) with body weight (r = 0.34), aortic diameter (r = 0.48), and cardiac output (r = 0.53). CONCLUSION: Flow-sensitive MRI was used to indirectly assess the presence of flow instabilities in vivo. The results in volunteers indicate the presence of flow instabilities in the young healthy aorta with a higher prevalence for men than women. J. Magn. Reson. Imaging 2011;33:839-846. © 2011 Wiley-Liss, Inc. |
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Authors:
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Aurélien F Stalder; Alex Frydrychowicz; Max F Russe; Jan G Korvink; Jürgen Hennig; Kuncheng Li; Michael Markl |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of magnetic resonance imaging : JMRI Volume: 33 ISSN: 1522-2586 ISO Abbreviation: J Magn Reson Imaging Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-03-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9105850 Medline TA: J Magn Reson Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 839-46 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Wiley-Liss, Inc. |
Affiliation:
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Department of Radiology, Xuanwu Hospital of Capital Medical University, Beijing, China; Department of Radiology - Medical Physics, University Hospital, Freiburg, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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