Reduction of coherent scattering noise with multiple receiver Doppler.
Doppler ultrasound (US) velocity estimates are inherently subject to error as a result of both Doppler ambiguity and coherent scattering. The coherent scattering error is a result of changes in the phase of the returned echo as particles enter and leave the sample volume. This phase depends on the distance from the transmitter to the scatterer and then to the receiver. This distance, in turn, depends on the angle of the receiver. A numerical simulation has been used to determine whether velocity estimates obtained from receiver probes at different angles are independent of one another. If so, then it is possible to obtain an improved velocity estimate from the combination of several receivers at different angles. The simulation results show that the cross-correlation between velocity estimates is reduced to 0.3 when receiver probes are oriented 5 degrees apart. These results suggest a new Doppler method that can significantly reduce velocity estimation error.
Jones
Steven A
SA
Louisiana Tech University, Biomedical Engineering, Ruston, LA 71272, USA. sajones@coes.latech.edu
Krishnamurthy
Kiran
K
D005583:Fourier Analysis; D008962:Models, Theoretical; D009622:Noise; D018608:Ultrasonography, Doppler / Q000295:instrumentation