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| Presentation | 2017-03-14 13:35 Improvement of Estimation Accuracy of Attenuation Coefficient using Scattered X-Rays -- Introduction of Photo-electric absorption -- Tetsuya Nakagami, Naohiro Toda (Aichi Prefectural Univ.), Yoichi Yamazaki (Kwansei Gakuin Univ.), Hiroki Yoshioka (Aichi Prefectural Univ.), Shuji Koyama (Nagoya Univ.)  MBE2016-97 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In cone-beam CT, the content ratio of the scattered X-rays increase with an increase in the cone angle. Because the sacattered X-rays are the main cause of artifacts in the reconstructed images, efforts have been made to improve the performance of the post-patient collimator located in front of the detector. However, scattered X-rays may have the potential to provide additional information on the attenuation coefficient of an object. If scattered X-rays contain independent components from that provided by primary X-rays, the estimating of the attenuation coefficient using both primary and scattered X-rays would be expected to improve the accuracy compared to using primary X-rays only. In our previous report, we theoretically clarified the principle that the use of a dedicated toroidal detectors for measuring the scattered X-rays improve the accuracy of the estimated attenuation coefficient according to a simplified model under the condition where no photo-electric absorption occurs. In this report, we derived the extended mathematical model including the photoelectric absorption and theoretically clarified effectiveness of using scattered X-rays. Furthermore, to demonstrate the validity of our theoretical approach, a Monte Carlo numerical experiment on the homogeneous thin cylinder was conducted. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | attenuation coefficient / scattered X-rays / Fisher information matrix / Monte Carlo simulation / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 116, no. 520, MBE2016-97, pp. 75-78, March 2017. | |
| Paper # | MBE2016-97 | |
| Date of Issue | 2017-03-06 (MBE) | |
| 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 | MBE2016-97 |
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| Conference Information | |
| Committee | MBE NC |
| Conference Date | 2017-03-13 - 2017-03-14 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kikai-Shinko-Kaikan Bldg. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | MBE |
| Conference Code | 2017-03-MBE-NC |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Improvement of Estimation Accuracy of Attenuation Coefficient using Scattered X-Rays |
| Sub Title (in English) | Introduction of Photo-electric absorption |
| Keyword(1) | attenuation coefficient |
| Keyword(2) | scattered X-rays |
| Keyword(3) | Fisher information matrix |
| Keyword(4) | Monte Carlo simulation |
| Keyword(5) | |
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| 1st Author's Name | Tetsuya Nakagami |
| 1st Author's Affiliation | Aichi Prefectural University (Aichi Prefectural Univ.) |
| 2nd Author's Name | Naohiro Toda |
| 2nd Author's Affiliation | Aichi Prefectural University (Aichi Prefectural Univ.) |
| 3rd Author's Name | Yoichi Yamazaki |
| 3rd Author's Affiliation | Kwansei Gakuin University (Kwansei Gakuin Univ.) |
| 4th Author's Name | Hiroki Yoshioka |
| 4th Author's Affiliation | Aichi Prefectural University (Aichi Prefectural Univ.) |
| 5th Author's Name | Shuji Koyama |
| 5th Author's Affiliation | Nagoya University (Nagoya Univ.) |
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| Speaker | Author-1 |
| Date Time | 2017-03-14 13:35:00 |
| Presentation Time | 25 minutes |
| Registration for | MBE |
| Paper # | MBE2016-97 |
| Volume (vol) | vol.116 |
| Number (no) | no.520 |
| Page | pp.75-78 |
| #Pages | 4 |
| Date of Issue | 2017-03-06 (MBE) |
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