Abstract
Recent studies have shown that real-time, two-dimensional shear-wave elastography (2D-SWE) can monitor liver fibrosis by measuring tissue elasticity (i.e., elastic modulus). Two clinical studies of 2D-SWE in the liver have shown that there are several practical issues that can compromise quantitation of liver tissue elasticity. Both general ultrasound (US) limitations and limitations in the 2D-SWE method itself resulted in significant variability in estimated liver elasticity. The most common US limitations were: poor acoustic window, limited penetration, and rib/lung shadows. The most common 2D-SWE limitations were: reverberations under the liver capsule, respiratory/cardiac motion, and vessel pulsation/loss of SWE signal. Based on these studies, scan protocols have been optimized to minimize the influence of these limitations on liver elasticity quantification. These refined protocols should move non-invasive SWE closer to becoming the preferred tool to diagnose and manage many chronic diseases of the liver.
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Acknowledgements
This work was supported in part by NIH RO1EB016034, R01CA170734, R01HL121226, RO1HL125339, R01EY026532, and Life Sciences Discovery Fund 3292512. We also thank Jeff Thiel and Manjiri Dighe of the University of Washington, for assistance in capturing clinical data.
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Bruce, M., Kolokythas, O., Ferraioli, G. et al. Limitations and artifacts in shear-wave elastography of the liver. Biomed. Eng. Lett. 7, 81–89 (2017). https://doi.org/10.1007/s13534-017-0028-1
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DOI: https://doi.org/10.1007/s13534-017-0028-1