The ability to measure multi-component velocity vectors in opaque flows, especially in blood flows, would have a number of important benefits. Over the last few years, we have developed a new technique, echo particle imaging velocimetry (echo PIV), based on the synthesis of two technologies: PIV and digital brightness-mode (B-mode) ultrasound contrast imaging. Recently-reported results using a custom-developed Echo PIV system  showed the utility of this technique in accurately measuring two-dimensional velocity vectors in a variety of opaque flows.
Addition of Particle Tracking Techniques to Improve Two-Dimensional Echo PIV for Opaque Flow Measurement
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Zhang, F, Liu, L, Zheng, H, & Shandas, R. "Addition of Particle Tracking Techniques to Improve Two-Dimensional Echo PIV for Opaque Flow Measurement." Proceedings of the ASME 2007 Summer Bioengineering Conference. ASME 2007 Summer Bioengineering Conference. Keystone, Colorado, USA. June 20–24, 2007. pp. 553-554. ASME. https://doi.org/10.1115/SBC2007-176035
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