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Open AccessArticle

Carotid Stenosis Assessment with Vector Concentration before and after Stenting

1
Department of Radiology, Copenhagen University Hospital, Rigshospitalet, 2100 Copenhagen, Denmark
2
Department of Clinical Medicine, University of Copenhagen, 2200 Copenhagen, Denmark
3
BK Medical, 2730 Herlev, Denmark
4
Center for Fast Ultrasound Imaging, Department of Health Technology, Technical University of Denmark, 2800 Lyngby, Denmark
*
Author to whom correspondence should be addressed.
Diagnostics 2020, 10(6), 420; https://doi.org/10.3390/diagnostics10060420
Received: 1 June 2020 / Revised: 8 June 2020 / Accepted: 18 June 2020 / Published: 20 June 2020
(This article belongs to the Special Issue New Trends in Vascular Imaging)
Digital subtraction angiography (DSA) is considered the reference method for the assessment of carotid artery stenosis; however, the procedure is invasive and accompanied by ionizing radiation. Velocity estimation with duplex ultrasound (DUS) is widely used for carotid artery stenosis assessment since no radiation or intravenous contrast is required; however, the method is angle-dependent. Vector concentration (VC) is a parameter for flow complexity assessment derived from the angle independent ultrasound method vector flow imaging (VFI), and VC has shown to correlate strongly with stenosis degree. The aim of this study was to compare VC estimates and DUS estimated peak-systolic (PSV) and end-diastolic velocities (EDV) for carotid artery stenosis patients, with the stenosis degree obtained with DSA. Eleven patients with symptomatic carotid artery stenosis were examined with DUS, VFI, and DSA before and after stent treatment. Compared to DSA, VC showed a strong correlation (r = −0.79, p < 0.001), while PSV (r = 0.68, p = 0.002) and EDV (r = 0.51, p = 0.048) obtained with DUS showed a moderate correlation. VFI using VC calculations may be a useful ultrasound method for carotid artery stenosis and stent patency assessment. View Full-Text
Keywords: vector concentration; vector flow imaging; duplex ultrasound; digital subtraction angiography; stenosis degree; carotid artery stenosis vector concentration; vector flow imaging; duplex ultrasound; digital subtraction angiography; stenosis degree; carotid artery stenosis
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Brandt, A.H.; Nguyen, T.-Q.; Gutte, H.; Frederik Carlsen, J.; Moshavegh, R.; Jensen, J.A.; Bachmann Nielsen, M.; Hansen, K.L. Carotid Stenosis Assessment with Vector Concentration before and after Stenting. Diagnostics 2020, 10, 420.

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