Shear wave speed measurement bias in a viscoelastic phantom across six ultrasound elastography systems: a comparative study with transient elastography and magnetic resonance elastography

Figures

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  Fig. 1. Phantom and probe settings. A probe was coupled to the phantom on an acoustic absorber using a jig

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  Fig. 2. Example of setting of region of interest: point shear wave elastography using a linear probe (a) and a convex probe (b) and two-dimensional color-coded shear wave elastography using a linear probe (c) and a convex probe (d)

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  Fig. 3. Shear wave speed images obtained with magnetic resonance elastography at excitation frequencies of 60, 90, and 120 Hz, and the region of interest (red dashed circle) for the mean and standard deviation calculations (color figure online)

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  Fig. 4. Box and whisker plots showing the SWS measurements using linear probes for nine measurement modes from six ultrasound systems at two focal depths (2 and 3 cm), transient elastography, and MRE. The horizontal dashed line represents the grand mean across all of the modes. The SWS of MRE was described, with the mean and standard deviation indicating spatial variation. SWS shear wave speed, ph phantom mode, br breast mode, point point shear wave elastography, 2D two-dimensional color-coded shear wave elastography, M M probe, XL XL probe, MRE magnetic resonance elastography

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  Fig. 5. Box and whisker plots showing the SWS measurements using convex probes for 10 measurement modes from six ultrasound systems at two focal depths (3 and 4 cm), transient elastography, and MRE. The horizontal dashed line represents the grand mean across all of the modes. The SWS of MRE was described, with the mean and standard deviation indicating spatial variation. SWS shear wave speed, ph phantom mode, abd abdominal mode, point point shear wave elastography, 2D two-dimensional color-coded shear wave elastography, M M probe, XL XL probe, MRE magnetic resonance elastography