Pihl, Michael Johannes1; Stuart, Matthias Bo1; Tomov, Borislav Gueorguiev1; Hansen, Peter Møller4; Nielsen, Michael Bachmann4; Jensen, Jørgen Arendt1
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 Hospital
The three-dimensional (3-D) Transverse Oscillation (TO) method is used to obtain 3-D velocity vector estimates in two orthogonal planes. The method is suitable for a real-time implementation. Data are acquired using a Vermon 3.0 MHz 32x32 element 2-D phased array and the experimental ultrasound scanner SARUS. Measurements are conducted on a carotid artery flow phantom from Danish Phantom Design, and 20 frames are acquired with a constant flow rate of 16.7±0.17 mL/s provided by a Shelley Medical Imaging Technologies CompuFlow 1000 system. The peak velocity magnitude in the vessel is found to be 52.3±8.1 m/s compared to an expected peak velocity of 53.6±0.54 cm/s. Based on the out-of-plane velocity component in the crosssectional plane, the estimated volumetric flow rates are 17.1±1.4 mL/s. The coefficient of variation is 8.3%, and the bias is 2.2%. An in vivo measurement of 3-D M-mode velocities is conducted over five heart beats. The peak systolic and end-diastolic velocities are 69±5.4 cm/s and 7.9±5.5 cm/s at the center of the vessel. For comparison, a commercial BK Medical ultrasound scanner using the spectral estimator yields 71.2 cm/s and 7.70 cm/s, respectively. The results demonstrate that the 3-D TO method can estimate 3-D velocities in two crossed planes, volumetric flow rates, and 3-D velocities in vivo.
Proceedings of the 2013 Ieee International Ultrasonics Symposium, 2013
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2013 IEEE International Ultrasonics Symposium, 2013