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Paper Abstract and Keywords
Presentation 2017-01-25 10:30
[Poster Presentation] Relationship of shear wave velocity and excited vibration waveform in tissue mimicking phantom
Hiroto Hasegawa, Shihei Mori, Shinnosuke Hirata, Hiroyuki Hachiya (Tokyo Tech) US2016-83
Abstract (in Japanese) (See Japanese page) 
(in English) It is known shear modulus of fibrotic liver tissues becomes larger than that of normal tissues. Many approaches to evaluate the degeneration degree of liver by generating shear wave in tissues have been propose. However, it has been reported that there is a difference between measured results of shear wave speed by ultrasound diagnosis apparatus which are used in clinical sites. In this study, we observed displacement of generated shear wave in phantom by using radiation force and estimated the shear modulus of the phantom. Using high speed scan of ultrasound probe, we measured shear wave displacement by phase of demodulated echo signals and visualized shear wave front．We evaluated relationship between shear wave speed and excited vibration speed．When excited vibration speed was small，displacement become small and shear wave frequency also become slightly small．Then, using three phantoms having different shear modulus, we examined how the difference of shear modulus affects the measured results of shear wave speed．When shear modulus of the phantom was large, displacement become small and shear wave frequency become large. Shear wave speeds were close to nominal values in all phantoms. However, it was obsered that shear wave speed became larger as a measuring depth from the surface of a phantom became large. We got fundamental data to estimate the effect of excited vibration waveform on the measurment of shear modulus.
Keyword (in Japanese) (See Japanese page) 
(in English) ultrasound / elastgraphy / shear wave / diffuse liver disease / hepatitis / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 419, US2016-83, pp. 55-60, Jan. 2017.
Paper # US2016-83 
Date of Issue 2017-01-18 (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 US2016-83

Conference Information
Committee EA US  
Conference Date 2017-01-25 - 2017-01-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Doshisha Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonic and Underwater Acoustics, and Related Topics 
Paper Information
Registration To US 
Conference Code 2017-01-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Relationship of shear wave velocity and excited vibration waveform in tissue mimicking phantom 
Sub Title (in English)  
Keyword(1) ultrasound  
Keyword(2) elastgraphy  
Keyword(3) shear wave  
Keyword(4) diffuse liver disease  
Keyword(5) hepatitis  
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Keyword(7)  
Keyword(8)  
1st Author's Name Hiroto Hasegawa  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Shihei Mori  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Shinnosuke Hirata  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
4th Author's Name Hiroyuki Hachiya  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2017-01-25 10:30:00 
Presentation Time 90 minutes 
Registration for US 
Paper # US2016-83 
Volume (vol) vol.116 
Number (no) no.419 
Page pp.55-60 
#Pages 6 
Date of Issue 2017-01-18 (US) 

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