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Paper Abstract and Keywords
Presentation 2016-10-07 14:55
A Method for Combining Sub-Array Averaging with Sub-Aperture Beamforming in Adaptive Beamformer
Hideyuki Hasegawa (Univ. Toyama) US2016-45
Abstract (in Japanese) (See Japanese page) 
(in English) We have increased the temporal resolution of ultrasonic imaging to more than 1 kHz for accurate measurement of tissue dynamics. In high-frame-rate ultrasound, unfocused beams are used in transmission, and the lateral resolution of the obtained ultrasonic image is degraded when the conventional beamforming method is used. Recently, adaptive beamforming is intensively studied for improvement of the lateral resolution in ultrasonic imaging. Although an adaptive beamformer suppresses undesired signals using ultrasonic echoes received by individual transducer elements, the computational complexity is higher than conventional delay and sum beamforming because of calculation of the spatial covariance matrix obtained from the received ultrasonic data. To improve the condition of the spatial covariance matrix, sub-array averaging is used in conventional adaptive beamforming. On the other hand, we have shown that the computational complexity of the adaptive beamformer could be reduced significantly by using the adaptive beamformer with sub-aperture beamforming. However, our beamformer does not use sub-array averaging, and the condition of the covariance matrix may be worse than that in conventional adaptive beamforming. In the present study, a strategy was examined for implementing sub-array averaging into our adaptive beamformer used with sub-aperture beamforming to improve the condition of the spatial covariance matrix.
Keyword (in Japanese) (See Japanese page) 
(in English) lateral spatial resolution / adaptive beamforming / spatial covariance matrix / sub-array averaging / / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 241, US2016-45, pp. 7-10, Oct. 2016.
Paper # US2016-45 
Date of Issue 2016-09-30 (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)
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Conference Information
Committee US  
Conference Date 2016-10-07 - 2016-10-07 
Place (in Japanese) (See Japanese page) 
Place (in English) College of Eng., Nihon Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To US 
Conference Code 2016-10-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Method for Combining Sub-Array Averaging with Sub-Aperture Beamforming in Adaptive Beamformer 
Sub Title (in English)  
Keyword(1) lateral spatial resolution  
Keyword(2) adaptive beamforming  
Keyword(3) spatial covariance matrix  
Keyword(4) sub-array averaging  
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1st Author's Name Hideyuki Hasegawa  
1st Author's Affiliation University of Toyama (Univ. Toyama)
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Speaker Author-1 
Date Time 2016-10-07 14:55:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2016-45 
Volume (vol) vol.116 
Number (no) no.241 
Page pp.7-10 
#Pages 4 
Date of Issue 2016-09-30 (US) 

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