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Paper Abstract and Keywords
Presentation 2019-01-22 14:00
[Poster Presentation] Basic study of measurement method of broadband ultrasonic attenuation in non-contact QUS
Toshiaki Okubo, Shinnosuke Hirata, Hiroyuki Hachiya (TokyoTech) US2018-100
Abstract (in Japanese) (See Japanese page) 
(in English) QUS is widely used as screenings of osteoporosis. In this study, a method of measurement of speed of sound (SOS) and broadband ultrasound attenuation (BUA) has been studied for non-contact QUS. In this report, a method of non-contact measurement of BUA using agar phantoms with silicone rubbers is described. First, agar phantoms containing 5 and 10 mmthickness silicone rubbers and the agar phantom without a silicone rubber were made. In non-contact QUS, extremely attenuated airborne ultrasound passed through a phantom have to be detected and evaluated. Therefore, the S/N of the pass-through ultrasound is improved by M-sequence pulse compression. Airborne ultrasound modulated by 13th-order M-sequence are transmitted to the phantom side. Then, received signals including pass-through waves are correlated with the transmitted Msequence. After that, analyzed signals extracted from cross-correlated signals were Fourier transformed. BUAs of phantoms are estimated by subtraction of the frequency spectrum of the phantom without a silicone rubber from those of phantoms with silicone rubbers. Estimated BUA were -4.77 dB/MHz (5 mm) and -5.78 dB/MHz (10 mm). respectively. BUAs and attenuation of high-frequency band increased as the thickness of the silicone rubber.
Keyword (in Japanese) (See Japanese page) 
(in English) Osteoporosis / Non-contact QUS / Airborne ultrasound / broadband ultrasound attenuation / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 409, US2018-100, pp. 103-106, Jan. 2019.
Paper # US2018-100 
Date of Issue 2019-01-15 (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 US2018-100

Conference Information
Committee EA US  
Conference Date 2019-01-22 - 2019-01-23 
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, Ultrasonics, and Related Topics 
Paper Information
Registration To US 
Conference Code 2019-01-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Basic study of measurement method of broadband ultrasonic attenuation in non-contact QUS 
Sub Title (in English)  
Keyword(1) Osteoporosis  
Keyword(2) Non-contact QUS  
Keyword(3) Airborne ultrasound  
Keyword(4) broadband ultrasound attenuation  
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1st Author's Name Toshiaki Okubo  
1st Author's Affiliation Tokyo Institute of Technology (TokyoTech)
2nd Author's Name Shinnosuke Hirata  
2nd Author's Affiliation Tokyo Institute of Technology (TokyoTech)
3rd Author's Name Hiroyuki Hachiya  
3rd Author's Affiliation Tokyo Institute of Technology (TokyoTech)
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Speaker Author-1 
Date Time 2019-01-22 14:00:00 
Presentation Time 120 minutes 
Registration for US 
Paper # US2018-100 
Volume (vol) vol.118 
Number (no) no.409 
Page pp.103-106 
#Pages
Date of Issue 2019-01-15 (US) 


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