title: Fast shear compounding using robust 2-D shear wave speed calculation and multi-directional filtering.
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.
authors.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.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Song
authors.affiliation: Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN, USA.
authors.forename: Armando
authors.initials: A
authors.lastname: Manduca
authors.affiliation: Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN, USA.
authors.forename: Heng
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN, USA.
authors.forename: Matthew W
authors.initials: MW
authors.lastname: Urban
authors.affiliation: Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN, USA.
authors.forename: James F
authors.initials: JF
authors.lastname: Greenleaf
authors.affiliation: Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine, Rochester, MN, USA. Electronic address: chen.shigao@mayo.edu.
authors.forename: Shigao
authors.initials: S
authors.lastname: Chen
mesh_terms: D000465:Algorithms; D016477:Artifacts; D054459:Elasticity Imaging Techniques / Q000295:instrumentation / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D059629:Signal-To-Noise Ratio
keywords: 2-D shear wave speed; Acoustic radiation force; Comb-push; Directional filter; Shear compounding; Shear wave elastography