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Paper Abstract and Keywords
Presentation 2009-01-19 13:30
[Poster Presentation] Phase Unwrapping Method for Phase-Contrast X-Ray CT Using AR-Model
Takaaki Horii, Qingkai Huo, Tadanori Fukami, Tetsuya Yuasa (Yamagata Univ.), Jin Wu, Thet-Thet- Lwin, Tohoru Takeda (Univ. of Tsukuba), Kazuyuki Hyodo (High Energy Accelerator Research Organization), Akio Yoneyama (Hitachi), Takao Akatsuka (Yamagata Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Phase-contrast CT tomographically delineates biological soft tissues, which cannot be clearly imaged using absorption contrast CT, at high contrast and high spatial resolution. Since the phase-contrast CT extracts phase-shift information from interferograms acquired using the x-ray interferometer, phase unwrapping is required in order to generate projections for CT reconstruction. In this research, we proposed a novel phase-unwrap method based on 2-D AR (Auto Regressive) model as follows: First, AR parameters modeling sinogram are estimated using pixels in partial regions unwrapped accurately with a conventional unwrap method. Next, based on the AR model, we detect sites of phase jump in the wrapped sinogram, and then to eliminate the phase jump by adding 2n (n is an integer) so that the residuals are as close to zero, i.e., an average of the residual-distribution, as possible. We investigated the efficacy of the algorithm by simulation data based on actual data acquired at KEK.
Keyword (in Japanese) (See Japanese page) 
(in English) Phase contrast / X-ray CT / Phase Unwrap / AR-model / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 385, MI2008-89, pp. 139-144, Jan. 2009.
Paper # MI2008-89 
Date of Issue 2009-01-12 (MI) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee MI  
Conference Date 2009-01-19 - 2009-01-21 
Place (in Japanese) (See Japanese page) 
Place (in English) National Taiwan University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Medical Imaging 
Paper Information
Registration To MI 
Conference Code 2009-01-MI 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Phase Unwrapping Method for Phase-Contrast X-Ray CT Using AR-Model 
Sub Title (in English)  
Keyword(1) Phase contrast  
Keyword(2) X-ray CT  
Keyword(3) Phase Unwrap  
Keyword(4) AR-model  
1st Author's Name Takaaki Horii  
1st Author's Affiliation Yamagata Univer (Yamagata Univ.)
2nd Author's Name Qingkai Huo  
2nd Author's Affiliation Yamagata Univer (Yamagata Univ.)
3rd Author's Name Tadanori Fukami  
3rd Author's Affiliation Yamagata Univer (Yamagata Univ.)
4th Author's Name Tetsuya Yuasa  
4th Author's Affiliation Yamagata Univer (Yamagata Univ.)
5th Author's Name Jin Wu  
5th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
6th Author's Name Thet-Thet- Lwin  
6th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
7th Author's Name Tohoru Takeda  
7th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
8th Author's Name Kazuyuki Hyodo  
8th Author's Affiliation KouEnerugii ButsurigakuKenkyusho (High Energy Accelerator Research Organization)
9th Author's Name Akio Yoneyama  
9th Author's Affiliation Advanced Research Laboratory, Hitachi, Ltd (Hitachi)
10th Author's Name Takao Akatsuka  
10th Author's Affiliation Yamagata Univer (Yamagata Univ.)
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Date Time 2009-01-19 13:30:00 
Presentation Time 210 
Registration for MI 
Paper # IEICE-MI2008-89 
Volume (vol) IEICE-108 
Number (no) no.385 
Page pp.139-144 
#Pages IEICE-6 
Date of Issue IEICE-MI-2009-01-12 

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