Conference paper
In-vivo evaluation of three ultrasound vector velocity techniques with MR angiography
In conventional Doppler ultrasound (US) the blood velocity is only estimated along the US beam direction. The estimate is angle corrected assuming laminar flow parallel to the vessel boundaries. As the now in the vascular system never is purely laminar, the velocities estimated with conventional Doppler US are always incorrect.
Three angle independent vector velocity methods are evaluated in this paper: directional beamforming (DB), synthetic aperture flow imaging (STA) and transverse oscillation (TO). The performances of the three methods were investigated by measuring the stroke volume in the right common carotid artery of eleven healthy volunteers, with magnetic resonance phase contrast angiography (MRA) as reference.
The correlation between the three vector velocity methods and MRA were: DB/MRA R=0.84 (p<0.01); STA/MRA R=0.95 (p<0.01); TO/MRA R=0.91 (p<0.01). Bland-Altman plots were additionally constructed and mean differences for the three comparisons were: DB/MRA = 0.17 ml; STA/MRA = 0.07 ml; TO/MRA = 0.24 ml.
The three US vector velocity techniques yield quantitative insight in to flow dynamics and can potentially give the clinician a powerful tool in cardiovascular disease assessment.
Language: | English |
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Publisher: | IEEE |
Year: | 2008 |
Pages: | 1060-1063 |
Proceedings: | 2008 IEEE International Ultrasonics Symposium |
Series: | I E E E International Ultrasonics Symposium. Proceedings |
ISBN: | 1424424283 , 1424424801 , 9781424424283 and 9781424424801 |
ISSN: | 15513025 and 10510117 |
Types: | Conference paper |
DOI: | 10.1109/ULTSYM.2008.0255 |
ORCIDs: | Jensen, Jørgen Arendt |
Angiography Array signal processing Bland-Altman plot Blood Carotid arteries MR angiography Magnetic resonance Magnetic resonance imaging Performance evaluation Phase measurement Ultrasonic imaging Volume measurement angiocardiography biomedical MRI biomedical ultrasonics blood flow measurement blood vessels cardiovascular disease assessment cardiovascular system directional beamforming diseases in-vivo three ultrasound vector velocity technique laminar flow magnetic resonance phase contrast angiography right common carotid artery stroke volume synthetic aperture flow imaging transverse oscillation