Hansen, Peter Møller4; Olesen, Jacob Bjerring1; Pihl, Michael Johannes1; Lange, Theis5; Heerwagen, Søren4; Pedersen, Mads Møller4; Rix, Marianne4; Lönn, Lars4; Jensen, Jørgen Arendt1; Nielsen, Michael Bachmann4
1 Department of Electrical Engineering, Technical University of Denmark2 Biomedical Engineering, Department of Electrical Engineering, Technical University of Denmark3 Center for Fast Ultrasound Imaging, Center, Technical University of Denmark4 Copenhagen University Hospital5 University of Copenhagen
Volume flow in arteriovenous fistulas for hemodialysis was measured using the angle-independent ultrasound technique Vector Flow Imaging and compared with flow measurements using the ultrasound dilution technique during dialysis. Using an UltraView 800 ultrasound scanner (BK Medical, Herlev, Denmark) with a linear transducer, 20 arteriovenous fistulas were scanned directly on the most superficial part of the fistula just before dialysis. Vector Flow Imaging volume flow was estimated with two different approaches, using the maximum and the average flow velocities detected in the fistula. Flow was estimated to be 242 mL/min and 404 mL/min lower than the ultrasound dilution technique estimate, depending on the approach. The standard deviations of the two Vector Flow Imaging approaches were 175.9 mL/min and 164.8 mL/min compared with a standard deviation of 136.9 mL/min using the ultrasound dilution technique. The study supports that Vector Flow Imaging is applicable for volume flow measurements.
Ultrasound in Medicine and Biology, 2014, Vol 40, Issue 11, p. 2707-2714