Conference paper
High Frame Rate Vector Velocity Estimation using Plane Waves and Transverse Oscillation
This paper presents a method for estimating 2-D vector velocities using plane waves and transverse oscillation. The approach uses emission of a low number of steered plane waves, which result in a high frame rate and continuous acquisition of data for the whole image. A transverse oscillating field is obtained by filtering the beamformed RF images in the Fourier domain using a Gaussian filter centered at a desired oscillation frequency.
Performance of the method is quantified through measurements with the experimental scanner SARUS and the BK 2L8 linear array transducer. Constant parabolic flow in a flow rig phantom is scanned at beam-to-flow angles of 90, 75, and 60◦ . The relative bias is between -1.4 % and -5.8 % and the relative std. between 5 % and 8.2 % for the lateral velocity component at the measured beam-to-flow angles.
The estimated flow angle is 73.4◦± 3.6◦ for the measurement at 75◦ . Measurement of pulsatile flow through a constricted vessel demonstrate the application of the method in a realistic flow environment with large spatial and temporal flow gradients.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2015 |
| Pages: | 1-4 |
| Proceedings: | 2015 IEEE International Ultrasonics Symposium |
| ISBN: | 1479981818 , 1479981826 , 1479981834 , 9781479981816 , 9781479981823 and 9781479981830 |
| Types: | Conference paper |
| DOI: | 10.1109/ULTSYM.2015.0423 |
| ORCIDs: | Jensen, Jonas , Stuart, Matthias Bo and Jensen, Jørgen Arendt |
BK 2L8 linear array transducer Electron tubes Estimation Fourier analysis Fourier domain Gaussian filter Gaussian processes Imaging Measurement Oscillators Radio frequency SARUS Ultrasonic imaging array signal processing beam-to-flow angle beamformed RF image filtering biomedical transducers biomedical ultrasonics blood flow measurement blood vessels constant parabolic flow constricted vessel flow rig phantom fluid oscillations high frame rate vector velocity estimation image filtering lateral velocity component phantoms pulsatile flow measurement relative bias spatial flow gradient spatiotemporal phenomena steered plane wave emission temporal flow gradient transverse oscillation ultrasonic imaging ultrasonic transducer arrays ultrasonic velocity measurement
