Sound field analysis for biological acoustic impedance microscope for its precise calibration

Naohiro Hozumi, Agus Indra Gunawan, Shota Kajima, Sachiko Yoshida, Yoshifumi Saijo, Kazuto Kobayashi, Seiji Yamamoto

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

4 Citations (Scopus)

Abstract

Acoustic impedance microscopy for biological soft tissues was 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. The reflection is normalized by using pure water, and interpreted into acoustic impedance. As the beam is focused, oblique incident analysis is required to acquire a precise interpretation. Sound potential is calculated at a particular plane, and decomposed into plane wave components with different wave numbers using Fourier Transform. Both pressure and shear waves are generated and taken into account, when oblique incident impinging the substrate. As a pulsed wave is propagating, pressure and shear waves can be separated in time domain. Reflection signal is calculated for each plane wave component, and the integral through the k-space represents the received signal. As the substrate has higher acoustic impedance than target, the normalized reflection intensity reduces with the increase in acoustic impedance of the target. The experimental plots were acquired by using different contents of saline solutions. They agreed with the calculation results by sound field analysis. Frequency dependence is negligible in the region of 30 - 100 MHz. By scanning the transducer, an acoustic impedance microimage was acquired and calibrated based on the above analysis

Original languageEnglish
Title of host publication2013 IEEE International Ultrasonics Symposium, IUS 2013
Pages1212-1215
Number of pages4
DOIs
Publication statusPublished - 2013 Dec 1
Event2013 IEEE International Ultrasonics Symposium, IUS 2013 - Prague, Czech Republic
Duration: 2013 Jul 212013 Jul 25

Publication series

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

Other

Other2013 IEEE International Ultrasonics Symposium, IUS 2013
CountryCzech Republic
CityPrague
Period13/7/2113/7/25

Keywords

  • Acoustic impedance microscopy
  • Fourier analysis
  • K-space
  • Sound field analysis

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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