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Paper Abstract and Keywords
Presentation 2016-02-29 15:45
Investigation on Estimation of 2D Displacement of a Target by Frequency Analysis of Ultrasonic Echoes
Kohei Yonei, Kaori Kaburaki, Hiroki Takahashi, Hideyuki Hasegawa (Univ. Toyama) US2015-117
Abstract (in Japanese) (See Japanese page) 
(in English) We are aiming to measure the dynamics of biological tissue by means of high frame rate ultrasonography. For measurement of the tissue dynamics, estimation of tissue displacement or velocity is essential. Currently, the speckle tracking method is frequently used for estimation of 2D tissue displacement. However, the computational load of the speckle tracking method is relatively heavy because it requires interpolation of the similarity function, such as correlation function, to obtain sub-sample displacement. In the present study, a method, which uses the 2D Fourier transform and does not require the interpolation process, was examined to reduce the computational load. In the proposed method, the 2D displacement was estimated using the phase of 2D frequency spectrum of the measured ultrasonic RF echo, which depends on the displacement of a scatterer. However, the accuracy in estimation of the 2D displacement would degrade when all the frequency components obtained by the 2D Fourier transform because the signal-to-noise ratio (SNR) is significantly worse in the frequency range, which is outside the frequency band of the ultrasonic echo. In the present study, contributions of frequency components with low SNRs are suppressed by the weighted least squares method using the amplitude frequency spectrum as the weighting function. The proposed method was validated in phantom experiments by estimating the 2D displacement produced by an automatic stage. The bias errors of the estimates obtained by the proposed method was evaluated at 1.3% both in the axial and lateral directions.
Keyword (in Japanese) (See Japanese page) 
(in English) Estimation of Two Dimensional Displacement / Frequency Analysis / Phase / / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 464, US2015-117, pp. 51-54, Feb. 2016.
Paper # US2015-117 
Date of Issue 2016-02-22 (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 US2015-117

Conference Information
Committee US  
Conference Date 2016-02-29 - 2016-02-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Instiute of Industrial Science, the University of Tokyo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustic Imaging, Nondestructive Inspection, and General 
Paper Information
Registration To US 
Conference Code 2016-02-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation on Estimation of 2D Displacement of a Target by Frequency Analysis of Ultrasonic Echoes 
Sub Title (in English)  
Keyword(1) Estimation of Two Dimensional Displacement  
Keyword(2) Frequency Analysis  
Keyword(3) Phase  
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1st Author's Name Kohei Yonei  
1st Author's Affiliation University of Toyama (Univ. Toyama)
2nd Author's Name Kaori Kaburaki  
2nd Author's Affiliation University of Toyama (Univ. Toyama)
3rd Author's Name Hiroki Takahashi  
3rd Author's Affiliation University of Toyama (Univ. Toyama)
4th Author's Name Hideyuki Hasegawa  
4th Author's Affiliation University of Toyama (Univ. Toyama)
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Speaker Author-4 
Date Time 2016-02-29 15:45:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2015-117 
Volume (vol) vol.115 
Number (no) no.464 
Page pp.51-54 
#Pages 4 
Date of Issue 2016-02-22 (US) 

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