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Paper Abstract and Keywords
Presentation 2010-07-09 14:30
An IIR Ramp Filter for Filtered Backprojection Reconstruction of X-ray CT
Kazuhisa Hayashi (Hitachizosen Corp.), Hiroshi Tsutsu, Hiroaki Morimoto (Okayama Univ.), Junichi Murakami (Kagawa college), Yoshitaka Morikawa (Okayama Univ.) MI2010-44
Abstract (in Japanese) (See Japanese page) 
(in English) It will be soon possible to be able to observe the moving 3D heart by X-ray CT in real time. Helical CT (HCT) is said to be the shortcut to such a 4D CT. In HCT, 2D reconstructed images are stacked to form a volume. Thus acceleration of 2D filtered backprojection algorithm (FBA) is valuable for 4D CT realization. The authors recently have developed order-N2log2N algorithm for backprojection. Therefore in FBA the cost of backprojection becomes comparable to that of filtering. The existing method for filtering converts the convolution with a ramp filter to the product in the FFT domain. In contrast, the new method decomposes a ramp filter into a cascade of differentiator and discrete Hilbert transformer (DHT), and directly applies them. Since allpass design of DHT yields very efficient realization, 4 to 5 times speed up for ramp filtering is possible comparing to the FFT method. We also propose a method to compromise ultralow frequency artifacts (dishing artifact) and ripple artifacts, using 1st order covariance model. Moreover, we expand the point spread function (PSF) from projection to backprojection with respect to the transition bandwidth. Since the lowest second order PSF implies the contribution to DC-shift, this paper proposes a compensation of DC-shift. Computer simulations showed the proposed method with DC-shift compensation is comparable to the existing method.
Keyword (in Japanese) (See Japanese page) 
(in English) CT / IIR Filter / Allpass Filter / Hilbert transformer / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 121, MI2010-44, pp. 39-44, July 2010.
Paper # MI2010-44 
Date of Issue 2010-07-02 (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 2010-07-09 - 2010-07-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokusima Univ. Kogyo-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) general medical imaging 
Paper Information
Registration To MI 
Conference Code 2010-07-MI 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An IIR Ramp Filter for Filtered Backprojection Reconstruction of X-ray CT 
Sub Title (in English)  
Keyword(1) CT  
Keyword(2) IIR Filter  
Keyword(3) Allpass Filter  
Keyword(4) Hilbert transformer  
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1st Author's Name Kazuhisa Hayashi  
1st Author's Affiliation Hitachizosen Corporation (Hitachizosen Corp.)
2nd Author's Name Hiroshi Tsutsu  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Hiroaki Morimoto  
3rd Author's Affiliation Okayama University (Okayama Univ.)
4th Author's Name Junichi Murakami  
4th Author's Affiliation Kagawa National College of Technology (Kagawa college)
5th Author's Name Yoshitaka Morikawa  
5th Author's Affiliation Okayama University (Okayama Univ.)
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Speaker Author-1 
Date Time 2010-07-09 14:30:00 
Presentation Time 25 minutes 
Registration for MI 
Paper # MI2010-44 
Volume (vol) vol.110 
Number (no) no.121 
Page pp.39-44 
#Pages 6 
Date of Issue 2010-07-02 (MI) 

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