| Accurate measurement of pulsatile flow velocity in a small tube phantom: comparison of phase-contrast cine magnetic resonance imaging and intraluminal Doppler guidewire. | |
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MedLine Citation:
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PMID: 20972856 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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PURPOSE: We compared the accuracy of magnetic resonance imaging (MRI) measurements of pulsatile flow velocity in a small tube phantom using different spatial factors versus those obtained by intraluminal Doppler guidewire examination (as reference). MATERIALS AND METHODS: We generated pulsatile flow velocities averaging about 20-290 cm/sec in a tube of 4 mm diameter; we performed phase-contrast cine MRI on pixels measuring 1.00(2)-2.50(2) mm(2). We quantified spatial peak flow velocities of a single pixel and a cluster of five pixels and spatial mean velocities within regions of interest enclosing the entire lumen in the phantom's cross-section. Finally, we compared the measurements of temporally mean and maximum flow velocity with the Doppler measurements. RESULTS: Linear correlation was excellent between both measurements of spatial peak flow velocities in one pixel. The highest spatial resolution using spatial peak flow velocities of a single pixel allowed the most accurate MRI measurements of both temporally mean and maximum pulsatile flow velocity (r = 0.97 and 0.99, respectively: MRI measurement = 0.95x + 8.9 and 0.88x + 24.0 cm/s, respectively). Otherwise, MRI measurements were significantly underestimated at lower spatial resolutions. CONCLUSION: High spatial resolution allowed accurate MRI measurement of temporally mean and maximum pulsatile flow velocity at spatial peak velocities of one pixel. |
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Authors:
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Haruhiko Machida; Yoshiaki Komori; Eiko Ueno; Yun Shen; Masami Hirata; Shinya Kojima; Munekuni Sato; Takeshi Okazaki; Ai Masukawa; Satoru Morita; Kazufumi Suzuki |
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Publication Detail:
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Type: Journal Article Date: 2010-10-24 |
Journal Detail:
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Title: Japanese journal of radiology Volume: 28 ISSN: 1867-108X ISO Abbreviation: Jpn J Radiol Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-10-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101490689 Medline TA: Jpn J Radiol Country: Japan |
Other Details:
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Languages: eng Pagination: 571-7 Citation Subset: IM |
Affiliation:
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Department of Radiology, Tokyo Women's Medical University, Medical Center East, Arakawa-ku, Tokyo, Japan. machira@dnh.twmu.ac.jp |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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