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摘要
The 3-D transverse oscillation method is investigated by estimating 3-D velocities in an experimental flow-rig system. Measurements of the synthesized transverse oscillating fields are presented as well. The method employs a 2-D transducer; decouples the velocity estimation; and estimates the axial, transverse, and elevation velocity components simultaneously. Data are acquired using a research ultrasound scanner. The velocity measurements are conducted with steady flow in sixteen different directions. For a specific flow direction with [alpha,beta] = [45, 15]degrees, the mean estimated velocity vector at the center of the vessel is (v(x), v(y), v(z)) = (33.8, 34.5, 15.2) +/- (4.6, 5.0, 0.6) cm/s where the expected velocity is (34.2, 34.2, 13.0) cm/s. The velocity magnitude is 50.6 +/- 5.2 cm/s with a bias of 0.7 cm/s. The flow angles alpha and beta are estimated as 45.6 +/- 4.9 degrees and 17.6 +/- 1.0 degrees. Subsequently, the precision and accuracy are calculated over the entire velocity profiles. On average for all direction, the relative mean bias of the velocity magnitude is -0.08%. For alpha and beta, the mean bias is -0.2 degrees nd -1.5 degrees. The relative standard deviations of the velocity magnitude ranges from 8 to 16%. For the flow angles, the ranges of the mean angular deviations are 5 degrees to 16 degrees and 0.7 degrees and 8 degrees.
- 出版日期2014-10
