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Paper Abstract and Keywords
Presentation 2013-01-24 13:10
Reduction of acquisition time in intersection profile method for 4D-MRI reconstruction of thoracoabdominal organs
Windra Swastika (Chiba Univ.), Yoshitada Masuda (Chiba Univ. Hospital), Hideaki Haneishi (Chiba Univ.) MI2012-73
Abstract (in Japanese) (See Japanese page) 
(in English) In this study, we developed an automatic reconstruction of 4D-MRI using the intersection profile method. This method requires several number of time sequential slices in sagittal plane and functions as a navigator slice. Data slices along the anterior and posterior axis are also captured to obtain several respiratory motions. Since the navigator slice and data slices are orthogonal to each other, it is possible to reconstruct a 4D-MRI based on the intersection of the respiratory patterns found in them. The synchronization is performed by calculating normalized cross correlation (NCC) between the respiratory pattern found in the navigator slice and data slices. In this study, we reduce the time acquisition for data slices using two approaches, namely a fixed threshold and an adaptive threshold. Fixed threshold sets a threshold value and terminate the acquisition once the NCC is value over the threshold value. Adaptive threshold determines threshold value based on the NCC value from the first 100 data slices frames. We perform both approaches to build 4D-MRI of six subjects and evaluate the geometric mean and total time to obtain all data slices compared with conventional data slices acquisition (without threshold). The preliminary results to reconstruct 4D-MRI using both approaches show a significant improvement in data slices time acquisition. Fixed threshold approach was able to reduce the time acquisition by 45% on average and 47% using adaptive threshold approach. Although the geometric mean value using both approaches were lower, the visualization of 4D-MRI using conventional data acquisition, fixed threshold and adaptive threshold showed insignificant difference.
Keyword (in Japanese) (See Japanese page) 
(in English) 4D-MRI / respiratory motion / intersection profile method / / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 411, MI2012-73, pp. 59-63, Jan. 2013.
Paper # MI2012-73 
Date of Issue 2013-01-17 (MI) 
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 MI2012-73

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 English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Reduction of acquisition time in intersection profile method for 4D-MRI reconstruction of thoracoabdominal organs 
Sub Title (in English)  
Keyword(1) 4D-MRI  
Keyword(2) respiratory motion  
Keyword(3) intersection profile method  
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1st Author's Name Windra Swastika  
1st Author's Affiliation Chiba University (Chiba Univ.)
2nd Author's Name Yoshitada Masuda  
2nd Author's Affiliation Chiba University Hospital (Chiba Univ. Hospital)
3rd Author's Name Hideaki Haneishi  
3rd Author's Affiliation Chiba University (Chiba Univ.)
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Speaker Author-1 
Date Time 2013-01-24 13:10:00 
Presentation Time 20 minutes 
Registration for MI 
Paper # MI2012-73 
Volume (vol) vol.112 
Number (no) no.411 
Page pp.59-63 
#Pages 5 
Date of Issue 2013-01-17 (MI) 

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