Key result
A phase-sensitive 2D motion estimator using the 2D Fourier transform yielded significantly better lateral velocity estimates (bias error 0.048 vs -0.366 mm/s) than the speckle tracking method.
Why the study?
Does a phase-sensitive 2D motion estimator using 2D Fourier transform improve accuracy and reduce calculation time compared to the speckle tracking method for measuring arterial wall motion?
Does a phase-sensitive 2D motion estimator using 2D Fourier transform improve accuracy and reduce calculation time compared to the speckle tracking method for measuring arterial wall motion?
Absolute Event Rate: 0.048% vs -0.366%
A novel phase-sensitive 2D motion estimator using the 2D Fourier transform offers superior accuracy and significantly lower computational cost than conventional speckle tracking for ultrasound-based arterial wall motion measurement.
May enable faster, more accurate ultrasound arterial wall motion tracking; leaves open clinical validation before practice change.
At present, the speckle tracking method is widely used as a two- or three-dimensional (2D or 3D) motion estimator for the measurement of cardiovascular dynamics. However, this method requires high-level interpolation of a function, which evaluates the similarity between ultrasonic echo signals in two frames, to estimate a subsample small displacement in high-frame-rate ultrasound, which results in a high computational cost. To overcome this problem, a 2D motion estimator using the 2D Fourier transform, which does not require any interpolation process, was proposed by our group. In this study, we compared the accuracies of the speckle tracking method and our method using a 2D motion estimator, and applied the proposed method to the measurement of motion of a human carotid arterial wall. The bias error and standard deviation in the lateral velocity estimates obtained by the proposed method were 0.048 and 0.282 mm/s, respectively, which were significantly better than those (−0.366 and 1.169 mm/s) obtained by the speckle tracking method. The calculation time of the proposed phase-sensitive method was 97% shorter than the speckle tracking method. Furthermore, the in vivo experimental results showed that a characteristic change in velocity around the carotid bifurcation could be detected by the proposed method.
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Miyajo et al. (2018) studied Measurement of arterial wall motion. Phase-sensitive 2D motion estimator using 2D Fourier transform vs. Speckle tracking method was evaluated on Bias error in lateral velocity estimates (mm/s). A phase-sensitive 2D motion estimator using the 2D Fourier transform yielded significantly better lateral velocity estimates (bias error 0.048 vs -0.366 mm/s) than the speckle tracking method.
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