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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトル2017 IEEE International Ultrasonics Symposium, IUS 2017
出版社IEEE Computer Society
ISBN(電子版)9781538633830
DOI
出版ステータスPublished - 2017 10月 31
イベント2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States
継続期間: 2017 9月 62017 9月 9

出版物シリーズ

名前IEEE International Ultrasonics Symposium, IUS
ISSN(印刷版)1948-5719
ISSN(電子版)1948-5727

Other

Other2017 IEEE International Ultrasonics Symposium, IUS 2017
国/地域United States
CityWashington
Period17/9/617/9/9

ASJC Scopus subject areas

  • 音響学および超音波学

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