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Paper Abstract and Keywords
Presentation 2013-01-25 13:10
in-vivo Brain MR Elastography using Mechanical Vibration of the Patient Table by Vibration Induced Switching Gradient
Hajime Ikeda (Chiba Univ.), Mikio Suga (Chiba Univ./NIRS), Atsuhisa Koyama, Shinpei Shimazaki (Chiba Univ.), Tetsuya Wakayama (GEHC-J), Riwa Kishimoto, Takayuki Obata (NIRS) MI2012-107
Abstract (in Japanese) (See Japanese page) 
(in English) Magnetic resonance elastography (MRE) is a noninvasive method for measuring tissue quantitative elasticity. Current brain MRE methods rely on devices such as bite-bar to elicit vibrations that are tracked by MR imaging. According to a previous study, the vibrations of the patient table that result from the impulse of an imaging gradient lobe could be used as a mechanical driving mechanism for MRE. We proposed new pulse sequence that includes switching gradient (SG) before a conventional MRE pulse sequence for using optional frequency. To determine the appropriated SG frequency for inducing the vibration of patient table, a gel phantom experiment was performed. The purpose of this study was to estimate repeatability of measuring human brain elasticity by in-vivo experiments. The in-vivo experiments were carried out multiple times on separate days on a like-for-like basis. Four healthy volunteers (female, age 21-57 years) were examined. The variation of coefficient was approximately 10%, therefore the reproducible result by proposed method was acquired. In addition, we obtained relation between the SG frequency and elasticity, that as the frequency increases, the elasticity increases.
Keyword (in Japanese) (See Japanese page) 
(in English) MR elastography / pulse sequence / elasticity measurement / MRI / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 411, MI2012-107, pp. 235-238, Jan. 2013.
Paper # MI2012-107 
Date of Issue 2013-01-17 (MI) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 MI  
Conference Date 2013-01-24 - 2013-01-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Bunka Tenbusu Kan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Computational anatomy and its application to computer assisted diagnosis and therapy, etc 
Paper Information
Registration To MI 
Conference Code 2013-01-MI 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) in-vivo Brain MR Elastography using Mechanical Vibration of the Patient Table by Vibration Induced Switching Gradient 
Sub Title (in English)  
Keyword(1) MR elastography  
Keyword(2) pulse sequence  
Keyword(3) elasticity measurement  
Keyword(4) MRI  
Keyword(5)  
Keyword(6)  
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1st Author's Name Hajime Ikeda  
1st Author's Affiliation Chiba University (Chiba Univ.)
2nd Author's Name Mikio Suga  
2nd Author's Affiliation Chiba University/National Institute of Radiological Sciences (Chiba Univ./NIRS)
3rd Author's Name Atsuhisa Koyama  
3rd Author's Affiliation Chiba University (Chiba Univ.)
4th Author's Name Shinpei Shimazaki  
4th Author's Affiliation Chiba University (Chiba Univ.)
5th Author's Name Tetsuya Wakayama  
5th Author's Affiliation GE Healthcare Japan Corpolation (GEHC-J)
6th Author's Name Riwa Kishimoto  
6th Author's Affiliation National Institute of Radiological Sciences (NIRS)
7th Author's Name Takayuki Obata  
7th Author's Affiliation National Institute of Radiological Sciences (NIRS)
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Speaker Author-1 
Date Time 2013-01-25 13:10:00 
Presentation Time 20 minutes 
Registration for MI 
Paper # MI2012-107 
Volume (vol) vol.112 
Number (no) no.411 
Page pp.235-238 
#Pages 4 
Date of Issue 2013-01-17 (MI) 

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