### Abstract

Tissue elasticity μ_{1} and viscosity μ_{2} can be estimated by evaluating dispersion of shear wave propagation velocity over a range of frequencies. Alternatively, μ_{1} and μ_{2} can be calculated from shear wave attenuation α_{s} and velocity c_{s} at a single frequency. For shear waves generated by a focused ultrasound beam, attenuation due to geometric spreading makes it difficult to estimate α_{s} correctly. In this study, we use a wide unfocused beam to generate quasi-planar radiation force (minimal diffraction) and monitor the out-of-plane (elevation direction) shear wave propagation using another transducer. Frequency dependent c_{s} and α_{s} values are calculated from the 2D Fourier transform (k-space) of the spatiotemporal shear wave data, using peak extraction and a full-width-of-half-maximum (FWHM) method. Simulation and experiment studies show good agreement between the results using the proposed method and the theoretical or independent measurement results. With the two probes placed on one side of the target or integrated into a 2D array probe, the proposed method could be applied to study in vivo tissue viscoelastic properties.

Original language | English (US) |
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Title of host publication | IEEE International Ultrasonics Symposium, IUS |

Pages | 212-215 |

Number of pages | 4 |

DOIs | |

State | Published - 2012 |

Event | 2012 IEEE International Ultrasonics Symposium, IUS 2012 - Dresden, Germany Duration: Oct 7 2012 → Oct 10 2012 |

### Other

Other | 2012 IEEE International Ultrasonics Symposium, IUS 2012 |
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Country | Germany |

City | Dresden |

Period | 10/7/12 → 10/10/12 |

### Fingerprint

### Keywords

- Attenuation
- Elasticity and viscosity
- FWHM
- Out-of-plane shear wave

### ASJC Scopus subject areas

- Acoustics and Ultrasonics

### Cite this

*IEEE International Ultrasonics Symposium, IUS*(pp. 212-215). [6562185] https://doi.org/10.1109/ULTSYM.2012.0053

**Measure elasticity and viscosity using the out-of-plane shear wave.** / Zhao, Heng; Qiang, Bo; Amador, Carolina; Song, Pengfei; Urban, Matthew W; Kinnick, Randall R.; Greenleaf, James F; Chen, Shigao D.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*IEEE International Ultrasonics Symposium, IUS.*, 6562185, pp. 212-215, 2012 IEEE International Ultrasonics Symposium, IUS 2012, Dresden, Germany, 10/7/12. https://doi.org/10.1109/ULTSYM.2012.0053

}

TY - GEN

T1 - Measure elasticity and viscosity using the out-of-plane shear wave

AU - Zhao, Heng

AU - Qiang, Bo

AU - Amador, Carolina

AU - Song, Pengfei

AU - Urban, Matthew W

AU - Kinnick, Randall R.

AU - Greenleaf, James F

AU - Chen, Shigao D

PY - 2012

Y1 - 2012

N2 - Tissue elasticity μ1 and viscosity μ2 can be estimated by evaluating dispersion of shear wave propagation velocity over a range of frequencies. Alternatively, μ1 and μ2 can be calculated from shear wave attenuation αs and velocity cs at a single frequency. For shear waves generated by a focused ultrasound beam, attenuation due to geometric spreading makes it difficult to estimate αs correctly. In this study, we use a wide unfocused beam to generate quasi-planar radiation force (minimal diffraction) and monitor the out-of-plane (elevation direction) shear wave propagation using another transducer. Frequency dependent cs and αs values are calculated from the 2D Fourier transform (k-space) of the spatiotemporal shear wave data, using peak extraction and a full-width-of-half-maximum (FWHM) method. Simulation and experiment studies show good agreement between the results using the proposed method and the theoretical or independent measurement results. With the two probes placed on one side of the target or integrated into a 2D array probe, the proposed method could be applied to study in vivo tissue viscoelastic properties.

AB - Tissue elasticity μ1 and viscosity μ2 can be estimated by evaluating dispersion of shear wave propagation velocity over a range of frequencies. Alternatively, μ1 and μ2 can be calculated from shear wave attenuation αs and velocity cs at a single frequency. For shear waves generated by a focused ultrasound beam, attenuation due to geometric spreading makes it difficult to estimate αs correctly. In this study, we use a wide unfocused beam to generate quasi-planar radiation force (minimal diffraction) and monitor the out-of-plane (elevation direction) shear wave propagation using another transducer. Frequency dependent cs and αs values are calculated from the 2D Fourier transform (k-space) of the spatiotemporal shear wave data, using peak extraction and a full-width-of-half-maximum (FWHM) method. Simulation and experiment studies show good agreement between the results using the proposed method and the theoretical or independent measurement results. With the two probes placed on one side of the target or integrated into a 2D array probe, the proposed method could be applied to study in vivo tissue viscoelastic properties.

KW - Attenuation

KW - Elasticity and viscosity

KW - FWHM

KW - Out-of-plane shear wave

UR - http://www.scopus.com/inward/record.url?scp=84882377539&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84882377539&partnerID=8YFLogxK

U2 - 10.1109/ULTSYM.2012.0053

DO - 10.1109/ULTSYM.2012.0053

M3 - Conference contribution

AN - SCOPUS:84882377539

SN - 9781467345613

SP - 212

EP - 215

BT - IEEE International Ultrasonics Symposium, IUS

ER -