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Paper Abstract and Keywords
Presentation 2026-02-18 14:55
Fundamental Study on Backscatter Anisotropy of Sheared Red Blood Cell Suspensions Using High-Frequency Ultrasound
Shoya Sakaguchi (Chiba Univ.), Emilie Franceschini (Aix-Marseille Univ./CNRS), Kenji Yoshida, Shinnosuke Hirata, Tadashi Yamaguchi (Chiba Univ.) US2025-61
Abstract (in Japanese) (See Japanese page) 
(in English) Red blood cell suspensions subjected to shear flow formed between concentric rotating cylinders (Couette flow) may exhibit anisotropy in the backscatter coefficient (BSC) depending on the ultrasound incidence angle. In this study, ultrasound data acquired in the 22--40~MHz frequency range under Couette flow were analyzed to evaluate the dependence of BSC on the incidence angle $beta$. For all shear rate conditions (shear rate; SR = 10, 31.6, and 100~s$^{-1}$), the BSC exhibited a U-shaped dependence on $beta$, reaching a minimum near $beta approx 90^circ$, where the ultrasound propagation direction is perpendicular to the flow. In particular, for SR = 31.6--100~s$^{-1}$, the anisotropy amplitude $Deltamathrm{BSC}$ reached approximately 4--6~dB. Furthermore, the U-shaped angular dependence of the BSC was consistently observed even when the depth of the region of interest (ROI) used for BSC estimation was varied. Without attenuation correction, deeper ROIs yielded lower BSC values, whereas attenuation correction substantially suppressed the depth dependence. Since the degree of angular dependence was independent of whether attenuation correction was applied, these results suggest that the observed anisotropy is not primarily attributable to attenuation effects.
Keyword (in Japanese) (See Japanese page) 
(in English) Ultrasound / Red blood cell suspension / Attenuation coefficient / Backscatter coefficient / Anisotropy / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 354, US2025-61, pp. 16-21, Feb. 2026.
Paper # US2025-61 
Date of Issue 2026-02-11 (US) 
ISSN 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 US2025-61

Conference Information
Committee US  
Conference Date 2026-02-18 - 2026-02-18 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustic imaging, NDT, Ultrasound in medicine, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2026-02-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fundamental Study on Backscatter Anisotropy of Sheared Red Blood Cell Suspensions Using High-Frequency Ultrasound 
Sub Title (in English)  
Keyword(1) Ultrasound  
Keyword(2) Red blood cell suspension  
Keyword(3) Attenuation coefficient  
Keyword(4) Backscatter coefficient  
Keyword(5) Anisotropy  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Shoya Sakaguchi  
1st Author's Affiliation Chiba Univesirty (Chiba Univ.)
2nd Author's Name Emilie Franceschini  
2nd Author's Affiliation Aix-Marseille University/CNRS (Aix-Marseille Univ./CNRS)
3rd Author's Name Kenji Yoshida  
3rd Author's Affiliation Chiba Univesirty (Chiba Univ.)
4th Author's Name Shinnosuke Hirata  
4th Author's Affiliation Chiba Univesirty (Chiba Univ.)
5th Author's Name Tadashi Yamaguchi  
5th Author's Affiliation Chiba Univesirty (Chiba Univ.)
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Speaker Author-1 
Date Time 2026-02-18 14:55:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2025-61 
Volume (vol) vol.125 
Number (no) no.354 
Page pp.16-21 
#Pages 6 
Date of Issue 2026-02-11 (US) 

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