Estimation of phase velocity and attenuation of visco-elastic plate with adaptive beamforming technique for cortical bone assessment

Shigeaki Okumura, Hirofumi Taki, Vu Hieu Nguyen, Toru Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The non-invasive cortical bone quality assessments using ultrasound axial transmission technique have attracted strong attention. The estimation of phase velocity and attenuation of absorbing plate should help the assessment. To get the high-resolution estimation, we employ an adaptive beamforming technique that uses an eigenvalue decomposition. The technique can estimate not only the phase velocities but also intensities of the multiple propagation modes separately. We situate two arrays in the whole array and compare the estimated intensities at the adjacent arrays. To remove unreliable estimates, we also situate sub-arrays with multiple sizes in the two arrays and evaluate the correspondences between the results with different sub-array sizes. The proposed method was evaluated by using numerical simulation. We used one transmitter and 28 receivers and a 5-mm-thick plate with longitudinal and shear wave velocities of 4430 m/s and 2120 m/s, respectively. The attenuations of the longitudinal and shear waves were 320 dB/MHz/m and 400 dB/MHz/m, respectively. The estimation error of the phase velocity and attenuation was 3.6 m/s and 2.4 dB/m, respectively. The proposed method accurately estimated the phase velocity and attenuation. We believe the method is suitable for bone quality assessments.

Original languageEnglish
Title of host publication2017 IEEE International Ultrasonics Symposium, IUS 2017
PublisherIEEE Computer Society
ISBN (Electronic)9781538633830
DOIs
Publication statusPublished - 2017 Oct 31
Event2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States
Duration: 2017 Sep 62017 Sep 9

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2017 IEEE International Ultrasonics Symposium, IUS 2017
CountryUnited States
CityWashington
Period17/9/617/9/9

Keywords

  • Adaptive signal processing
  • Axial transmission
  • Cortical bone
  • Guided wave

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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