| An automatic angle tracking procedure for feasible vector Doppler blood velocity measurements. | |
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MedLine Citation:
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PMID: 20133036 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two-dimensional angle-independent blood velocity estimates typically combine the Doppler frequencies independently measured by two ultrasound beams with known interbeam angle. A different dual-beam approach was recently introduced in which one (reference) beam is used to identify the flow direction, and the second (measuring) beam directly estimates the true flow velocity at known beam-flow angle. In this paper, we present a procedure to automatically steer the two beams along optimal orientations so that the velocity magnitude can be measured. The operator only takes care of locating the Doppler sample volume in the region of interest and, through the extraction of appropriate parameters from the Doppler spectrum, the reference beam is automatically steered toward right orientation to the flow. The velocity magnitude is thus estimated by the measuring beam, which is automatically oriented with respect to the (known) flow direction at a suitable Doppler angle. The implementation of the new angle tracking method in the ULtrasound Advanced Open Platform (ULA-OP), connected to a linear array transducer, is reported. A series of experiments shows that the proposed method rapidly locks the flow direction and measures the velocity magnitude with low variability for a large range of initial probe orientations. In vitro tests conducted in both steady and pulsatile flow conditions produced coefficients of variability (CV) below 2.3% and 8.3%, respectively. The peak systolic velocities have also been measured in the common carotid arteries of 13 volunteers, with mean CV of 7%. |
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Authors:
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Piero Tortoli; Alessandro Dallai; Enrico Boni; Lorenzo Francalanci; Stefano Ricci |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-04 |
Journal Detail:
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Title: Ultrasound in medicine & biology Volume: 36 ISSN: 1879-291X ISO Abbreviation: Ultrasound Med Biol Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-22 Completed Date: 2010-05-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0410553 Medline TA: Ultrasound Med Biol Country: England |
Other Details:
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Languages: eng Pagination: 488-96 Citation Subset: IM |
Copyright Information:
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Copyright 2010 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Electronics and Telecommunications, Universit? degli Studi di Firenze, Florence, Italy. piero.tortoli@unifi.it |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Automation Blood Flow Velocity Carotid Artery, Common / ultrasonography* Diagnostic Techniques, Cardiovascular / instrumentation Humans Middle Aged Reference Standards Ultrasonography, Doppler* Young Adult |
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