| Real-time interactive duplex MR measurements: application in neurovascular imaging. | |
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MedLine Citation:
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PMID: 11517079 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Real-time interactive duplex MR imaging is a new phase-contrast MR imaging technique that enables the quantification and display of flow velocities in real time without the need for cardiac gating. We investigated the feasibility and reliability of the technique to assess hemodynamic information both in vitro and in vivo in the carotid arteries and in the venous sinuses. SUBJECTS AND METHODS: Real-time interactive duplex MR measurements (TR/TE, 53/27; flip angle, 90 degrees; encoding velocity, 100 or 150 cm/sec) were performed in vitro with a steady-flow phantom and in 10 healthy volunteers in whom common and internal carotid artery velocities were measured. In eight volunteers, velocity measurements were also performed in the superior sagittal sinus during both normal breathing and hyperventilation. Time-velocity plots were analyzed qualitatively and quantitatively and compared with findings from conventional segmented k-space phase-contrast MR imaging and Doppler sonography. RESULTS: Velocity determinations for real-time duplex MR and conventional phase-contrast MR imaging showed an in vitro correlation of 0.99 and an in vivo correlation of 0.83 (carotid arteries) and 0.76 (venous sinus). Velocity measurements in the carotid arteries with real-time MR imaging were significantly lower than those obtained with conventional phase-contrast MR (averaged, 7.8%; p = 0.003) or sonography (23.7%, p < 0.001), likely because of volume averaging. Small but significant velocity changes occurring in the venous sinus during hyperventilation were reliably identified with both MR techniques. CONCLUSION: Real-time interactive duplex MR imaging can be effectively applied in neurovascular imaging to obtain hemodynamic information. |
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Authors:
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S G Wetzel; V S Lee; A G Tan; O Heid; S Cha; G Johnson; N M Rofsky |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: AJR. American journal of roentgenology Volume: 177 ISSN: 0361-803X ISO Abbreviation: AJR Am J Roentgenol Publication Date: 2001 Sep |
Date Detail:
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Created Date: 2001-08-22 Completed Date: 2001-09-20 Revised Date: 2008-02-15 |
Medline Journal Info:
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Nlm Unique ID: 7708173 Medline TA: AJR Am J Roentgenol Country: United States |
Other Details:
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Languages: eng Pagination: 703-7 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, New York University Medical Center, 530 First Ave., HCC Basement-MRI, New York, NY 10016, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aged, 80 and over Blood Flow Velocity / physiology Carotid Arteries / anatomy & histology* Cranial Sinuses / anatomy & histology* Female Hemodynamics / physiology* Humans Image Processing, Computer-Assisted* Magnetic Resonance Imaging / methods* Male Middle Aged Phantoms, Imaging Reference Values Sensitivity and Specificity |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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