Validation of transverse oscillation vector velocity estimation in- vivo

K. L. Hansen, J. Udesen, C. Thomsen, J. A. Jensen, M. B. Nielsen

    Publikation: Bidrag til bog/antologi/rapportKonferencebidragForskningpeer review

    Abstract

    Conventional Doppler methods for blood velocity estimation only estimate the velocity component along the ultrasound (US) beam direction. This implies that a Doppler angle under examination close to 90° results in unreliable information about the true blood direction and blood velocity. The novel method Transverse Oscillation (TO), which combines estimates of the axial and the transverse velocity components in the scan plane, makes it possible to estimate the vector velocity of the blood regardless of the Doppler angle. The present study evaluates the TO method with magnetic resonance angiography (MRA) by comparing in-vivo measurements of stroke volume (SV) obtained from the right common carotid artery. Angle of insonation was 90° for the TO measurements. Eleven healthy volunteers were scanned with the TO method and MRA. The overall results were as follows: mean SV +/- STD for TO: 5.5 ml +/- 1.7 ml and for MRA: 5.8 ml +/- 2.0 ml with the full range for TO: 3.4 ml - 9.5 ml and for MRA 3.0 ml - 10.8 ml. The correlation between the SV estimated by TO and MRA was 0.91 (p < 0.01; 95 % CI: 0.69 to 0.98) with the equation for the line of regression MRA = 1.1·TO - 0.4. A Bland-Altman plot was constructed where the mean difference was 0.2 ml with limits of agreement at -1.4 ml and 1.9 ml (95 % CI for mean difference: -0.3 ml to 0.8 ml). The strong correlation and the low mean difference between the TO method and MRA indicates that reliable vector velocity estimates can be obtained in vivo using the presented angle independent 2-D vector velocity method. The results give reason to believe that the TO method can be a useful alternative to conventional Doppler systems bringing forth new information to the US examination of blood flow.

    OriginalsprogEngelsk
    Titel2007 IEEE Ultrasonics Symposium Proceedings, IUS
    Sider1093-1096
    Antal sider4
    DOI
    StatusUdgivet - 1 dec. 2007
    Begivenhed2007 IEEE Ultrasonics Symposium, IUS - New York, NY, USA
    Varighed: 28 okt. 200731 okt. 2007

    Publikationsserier

    NavnProceedings - IEEE Ultrasonics Symposium
    ISSN (Trykt)1051-0117

    Konference

    Konference2007 IEEE Ultrasonics Symposium, IUS
    Land/OmrådeUSA
    ByNew York, NY
    Periode28/10/0731/10/07

    Fingeraftryk

    Udforsk hvilke forskningsemner 'Validation of transverse oscillation vector velocity estimation in- vivo' indeholder.

    Citationsformater