doi:

DOI: 10.3724/SP.J.1249.2018.01022

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:1 PP.22-28

A shear wave elastography method based on 2D Savitzky-Golay digital differentiator


Abstract:
We propose a new shear wave elastography method based on the 2D Savitzky-Golay (SG) digital differentiator in the shear wave speed estimation. The 2D SG digital differentiator utilizes two dimensional surface fitting method to obtain the arrival time of shear wave's wave-front. In comparison with the linear regression method, the 2D SG digital differentiator is not only less affected by the outlier data but also more robust. Moreover, we use the ultrasound elastic phantom experiments to evaluate the two methods and compare the shear wave elastograms obtained by the two methods. The elastograms obtained by our proposed method are smoother and have lower noise than those of linear regression method, while the lateral resolutions of images are the same. In our phantom experiment, the shear wave elastograms for our new method have higher signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). The research shows that the new proposed method effectively improves the quality of shear wave elastogram.

Key words:biomedical engineering,medical imaging,ultrasound imaging,shear wave elastography,shear wave speed estimation,Young's modulus

ReleaseDate:2018-03-20 15:26:55



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