Fast Shear Compounding Using Robust 2-D Shear Wave Speed Calculation and Multi-directional Filtering |
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Authors: | Pengfei Song Armando Manduca Heng Zhao Matthew W. Urban James F. Greenleaf Shigao Chen |
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Affiliation: | ∗ Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN, USA;† Mayo Graduate School, Mayo Clinic College of Medicine, Rochester, MN, USA |
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Abstract: | A fast shear compounding method was developed in this study using only one shear wave push-detect cycle, such that the shear wave imaging frame rate is preserved and motion artifacts are minimized. The proposed method is composed of the following steps: 1. Applying a comb-push to produce multiple differently angled shear waves at different spatial locations simultaneously; 2. Decomposing the complex shear wave field into individual shear wave fields with differently oriented shear waves using a multi-directional filter; 3. Using a robust 2-D shear wave speed calculation to reconstruct 2-D shear elasticity maps from each filter direction; and 4. Compounding these 2-D maps from different directions into a final map. An inclusion phantom study showed that the fast shear compounding method could achieve comparable performance to conventional shear compounding without sacrificing the imaging frame rate. A multi-inclusion phantom experiment showed that the fast shear compounding method could provide a full field-of-view, 2-D and compounded shear elasticity map with three types of inclusions clearly resolved and stiffness measurements showing excellent agreement to the nominal values. |
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Keywords: | Shear compounding Shear wave elastography 2-D shear wave speed Directional filter Comb-push Acoustic radiation force |
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