A method to estimate wall shear rate with a clinical ultrasound scanner.
A simple technique to estimate the wall shear rate in healthy arteries using a clinical ultrasound scanner has been developed. This method uses the theory of fully developed oscillatory flow together with a spectral Doppler trace and an estimate of mean arterial diameter. A method using color flow imaging was compared with the spectral Doppler method in vascular phantoms and found to have errors that were on average 35% greater. Differences from the theoretic value for the time averaged wall shear rate using the spectral Doppler method varied by artery: brachial -9 (1) %; carotid -7 (1) %; femoral -22 (4) %; and fetal aorta -17 (10) %. Test measurements obtained from one healthy volunteer demonstrated the feasibility of the technique in vivo.
Blake
James R
JR
Medical Physics, The University of Edinburgh, Edinburgh, UK. james.blake@ed.ac.uk
Meagher
Siobhan
S
Fraser
Katharine H
KH
Easson
William J
WJ
Hoskins
Peter R
PR
D001011:Aorta / Q000000981:diagnostic imaging / Q000196:embryology; D001158:Arteries / Q000000981:diagnostic imaging / Q000502:physiology*; D001916:Brachial Artery / Q000000981:diagnostic imaging; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D004548:Elasticity; D005263:Femoral Artery / Q000000981:diagnostic imaging; D006801:Humans; D008955:Models, Cardiovascular; D019047:Phantoms, Imaging; D011673:Pulsatile Flow; D012680:Sensitivity and Specificity; D033081:Shear Strength; D018608:Ultrasonography, Doppler / Q000379:methods; D018615:Ultrasonography, Doppler, Color / Q000379:methods*