Premium
Flow Velocity Vector Fields by Ultrasound Particle Imaging Velocimetry
Author(s) -
Westerdale John,
Belohlavek Marek,
McMahon Eileen M.,
Jiamsripong Panupong,
Heys Jeffrey J.,
Milano Michele
Publication year - 2011
Publication title -
journal of ultrasound in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 91
eISSN - 1550-9613
pISSN - 0278-4297
DOI - 10.7863/jum.2011.30.2.187
Subject(s) - particle image velocimetry , physics , perpendicular , optics , velocimetry , ultrasound , vector field , flow velocity , plane (geometry) , velocity vector , flow (mathematics) , acoustics , computational physics , geometry , turbulence , mechanics , mathematics
Objectives We performed an in vitro study to assess the precision and accuracy of particle imaging velocimetry (PIV) data acquired using a clinically available portable ultrasound system via comparison with stereo optical PIV. Methods The performance of ultrasound PIV was compared with optical PIV on a benchmark problem involving vortical flow with a substantial out‐of‐plane velocity component. Optical PIV is capable of stereo image acquisition, thus measuring out‐of‐plane velocity components. This allowed us to quantify the accuracy of ultrasound PIV, which is limited to in‐plane acquisition. The system performance was assessed by considering the instantaneous velocity fields without extracting velocity profiles by spatial averaging. Results Within the 2‐dimensional correlation window, using 7 time‐averaged frames, the vector fields were found to have correlations of 0.867 in the direction along the ultrasound beam and 0.738 in the perpendicular direction. Out‐of‐plane motion of greater than 20% of the in‐plane vector magnitude was found to increase the SD by 11% for the vectors parallel to the ultrasound beam direction and 8.6% for the vectors perpendicular to the beam. Conclusions The results show a close correlation and agreement of individual velocity vectors generated by ultrasound PIV compared with optical PIV. Most of the measurement distortions were caused by out‐of‐plane velocity components.