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Paper Abstract and Keywords
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
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
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 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  
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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Date Time 2017-03-14 13:35:00 
Presentation Time 25 
Registration for MBE 
Paper # IEICE-MBE2016-97 
Volume (vol) IEICE-116 
Number (no) no.520 
Page pp.75-78 
#Pages IEICE-4 
Date of Issue IEICE-MBE-2017-03-06 

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