NDLI: Viscoelastic imaging using acoustic impedance microscope and its application to biological tissue

Content Provider	IEEE Xplore Digital Library
Author	Hozumi, N. Kajima, S. Gunawan, A.I. Yoshida, S. Kobayashi, K. Saijo, Y. Yamamoto, S.
Copyright Year	2015
Description	Author affiliation: Honda Electron. Co., Ltd., Toyohashi, Japan (Kobayashi, K.) \|\| Tohoku Univ., Sendai, Japan (Saijo, Y.) \|\| Sch. of Med., Hamamatsu Univ., Hamamatsu, Japan (Yamamoto, S.) \|\| Electr. & Electron. Inf. Eng. Dept., Toyohashi Univ. of Technol., Toyohashi, Japan (Hozumi, N.; Kajima, S.; Gunawan, A.I.; Yoshida, S.)
Abstract	A new method of viscoelastic micro-imaging for soft biological tissue has been proposed. A target is placed on a plastic substrate. Ultrasonic beam, which is focused on the target, is transmitted and the reflection is received by the same transducer. Shear wave can be produced as the result of oblique incidence to the substrate. By adjusting the distance between the transducer and target either pressure or shear wave can be focused onto the target. It is easy to identify and extract each mode of the reflection in time domain, because pulse wave is transmitted. The reflection is once interpreted into characteristic acoustic impedance of the target, making use of the acoustic parameters of the substrate and reference material. Precise sound field analysis is required to create the calibration curve, because the incidence is not totally perpendicular to the substrate. The acoustic impedance for pressure wave is directly converted into bulk modulus. The (apparent) acoustic impedance for shear wave is interpreted into shear modulus and viscosity, making use of its frequency dependency. A 2-D profile of bulk modulus, shear modulus and viscosity may be obtained by mechanically scanning the transducer. As for a preliminary experiment, cancerous liver of rat was observed using acoustic impedance microscope with a frequency range of roughly 30-100 MHz. Viscosity profile showed a good correlation with stained image by optical microscope.
Starting Page	1
Ending Page	4
File Size	568275
Page Count	4
File Format	PDF
e-ISBN	9781479981823
DOI	10.1109/ULTSYM.2015.0172
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-21
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustics Impedance Substrates Reflection Transducers Microscopy Biological tissues biological soft tissue acoustic impedance microscopy viscoelastic micro-imaging
Content Type	Text
Resource Type	Article

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