NDLI: The accuracy of volume flow measurements derived from pulsed wave Doppler: A study in the complex setting of forearm vascular access for hemodialysis

Content Provider	IEEE Xplore Digital Library
Author	Swillens, A. Van Canneyt, K. Segers, P. Lovstakken, L.
Copyright Year	2012
Description	Author affiliation: Dept. of Circulation & Med. Imaging, NTNU, Trondheim, Norway (Lovstakken, L.) \|\| IBiTech-bioMMeda, Ghent Univ., Ghent, Belgium (Swillens, A.; Van Canneyt, K.; Segers, P.)
Abstract	Purpose: Maturation of an arterio-venous fistula (AVF) frequently fails, with low postoperative fistula flow as a prognostic marker for this event. As pulsed wave Doppler (PWD) is commonly used to assess volume flow, we studied the accuracy of this measurement in the setting of a radiocephalic AVF. Methods: As in-vivo validation of fistula flow measurements is cumbersome, we performed simulations, integrating computational fluid dynamics with an ultrasound (US) simulator. Flow in the arm was calculated, based on a patient-specific model of the arm vasculature pre and post AVF creation. Next, raw ultrasound signals were simulated, from which the Doppler spectra were calculated in both a proximal (brachial) and a distal (radial) location. Results:The velocity component in the direction of the US beam, in a centred, small, sample volume, can be captured accurately using PWD spectrum mean-tracking. However, deriving flow rate from these measurements is prone to errors: (i) the angle-correction which is influenced by the radial velocity components in the complex flow field; (ii) the largest error is introduced due to a lack of knowledge on the spatial flow profile.
Starting Page	1960
Ending Page	1963
File Size	7502282
Page Count	4
File Format	PDF
ISBN	9781467345613
ISSN	19485719
e-ISBN	9781467345620
DOI	10.1109/ULTSYM.2012.0491
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Doppler effect Ultrasonic imaging Computational fluid dynamics Velocity measurement Arteries Computational modeling Volume measurement
Content Type	Text
Resource Type	Article

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