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Paper Abstract and Keywords
Presentation 2013-05-27 16:45
Numerical analyses using FDTD method for acoustic propagation in tissues by airborne ultrasonics
Shinnosuke Hirata, Hiroyuki Hachiya (Tokyo Inst. of Tech.) US2013-14
Abstract (in Japanese) (See Japanese page) 
(in English) Elastic properties or tissue structure can be quantitatively evaluated by measuring the velocity or attenuation of ultrasonic waves, which propagate in tissues. This method of quantitative diagnosis is widely applied because the method is minimally invasive and free from X-ray exposure. In this study, non-contact calcaneus inspection from measurement of a propagation time of an airborne ultrasonic wave, which is passed through a heel, is proposed. Detection of an ultrasonic wave, which is extremely attenuated to pass through a heel, has been reported. However, the echo, which directly propagates in the calcaneus, cannot be identified because multiple-reflection echoes in medium boundaries and echoes, which propagate around the heel or calcaneus, were include in received wave forms. Therefore, two-dimensional sound field calculation using acoustic FDTD method has been studied. However, numerical dispersion is caused by delay of the phase velocity in the medium within slow propagation velocity, because propagation velocities of an acoustic wave in air, soft tissues and heel bones are different more than 10 times. In this paper, dispersion errors of FDTD sound field calculations in air by phase-velocity delay are quantitatively evaluated in various space grids and time grids of simulations. In case an interval of time grid is too short for that of space grid, the phase velocity delays. The delay can be suppressed by improving the space resolution. In case a point per wavelength (PPW), which is corresponding to the space resolution, is more than 100, dispersion errors in the received wave form can be reduced to several % of the transmitted signal's amplitude.
Keyword (in Japanese) (See Japanese page) 
(in English) Airborne ultrasonic / Acoustic propagation in tissue / Acoustic finite-difference time-domain method / / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 68, US2013-14, pp. 35-39, May 2013.
Paper # US2013-14 
Date of Issue 2013-05-20 (US) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF US2013-14

Conference Information
Committee US  
Conference Date 2013-05-27 - 2013-05-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To US 
Conference Code 2013-05-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Numerical analyses using FDTD method for acoustic propagation in tissues by airborne ultrasonics 
Sub Title (in English)  
Keyword(1) Airborne ultrasonic  
Keyword(2) Acoustic propagation in tissue  
Keyword(3) Acoustic finite-difference time-domain method  
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1st Author's Name Shinnosuke Hirata  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
2nd Author's Name Hiroyuki Hachiya  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2013-05-27 16:45:00 
Presentation Time 30 minutes 
Registration for US 
Paper # US2013-14 
Volume (vol) vol.113 
Number (no) no.68 
Page pp.35-39 
#Pages 5 
Date of Issue 2013-05-20 (US) 

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