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| Paper Abstract and Keywords | ||
| Presentation | 2019-03-06 15:30 Estimation of inhomogeneous shear modulus distribution based on measurements of the displacement field using MRI Osamu Kojima, Takaaki Nara (The Univ. of Tokyo)  MBE2018-115 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The stiffness (shear modulus) of an abnormal tissue (e.g. fibrotic tissue and cancerous tissue) is different from that of a normal tissue. Hence, it is important to estimate the shear modulus distribution for determining the position, shape, and degree of progress of such an abnormal tissue. One way to estimate the shear modulus distribution is by employing magnetic resonance elastography (MRE). In conventional MRE approaches, the displacement field induced by elastic waves is measured by employing magnetic resonance imaging (MRI) , and the shear modulus distribution is calculated on the basis of Navier's equation. However, owing to the assumption that the shear modulus is locally homogeneous, significant error in estimation can occur around the most important regions where elastic properties change discontinuously. Additionally, finite difference approximation of second order derivative terms of the displacement can cause vulnerability to noise. In this study, a novel method is proposed for estimating the shear modulus distribution from the ratio of the complex stress sum calculated through integration of the displacement data to the complex strain sum calculated from first order differentiation of the displacement data, where the real and imaginary components of the complex stress sum are deviatoric and shear stress, respectively, and those of the complex strain sum are deviatoric and shear strain, respectively. Furthermore, the robustness of the proposed method is also demonstrated in this study. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | MRI / MR elastography / shear modulus / inhomogeneous / Dbar equation / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 118, no. 469, MBE2018-115, pp. 147-152, March 2019. | |
| Paper # | MBE2018-115 | |
| Date of Issue | 2019-02-25 (MBE) | |
| 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 | MBE2018-115 |
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| Conference Information | |
| Committee | NC MBE |
| Conference Date | 2019-03-04 - 2019-03-06 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | University of Electro Communications |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | MBE |
| Conference Code | 2019-03-NC-MBE |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Estimation of inhomogeneous shear modulus distribution based on measurements of the displacement field using MRI |
| Sub Title (in English) | |
| Keyword(1) | MRI |
| Keyword(2) | MR elastography |
| Keyword(3) | shear modulus |
| Keyword(4) | inhomogeneous |
| Keyword(5) | Dbar equation |
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| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Osamu Kojima |
| 1st Author's Affiliation | The University of Tokyo (The Univ. of Tokyo) |
| 2nd Author's Name | Takaaki Nara |
| 2nd Author's Affiliation | The University of Tokyo (The Univ. of Tokyo) |
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| Speaker | Author-1 |
| Date Time | 2019-03-06 15:30:00 |
| Presentation Time | 25 minutes |
| Registration for | MBE |
| Paper # | MBE2018-115 |
| Volume (vol) | vol.118 |
| Number (no) | no.469 |
| Page | pp.147-152 |
| #Pages | 6 |
| Date of Issue | 2019-02-25 (MBE) |
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