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Proceedings Paper

Correction method of surface effects in infrared laser transillumination CT imaging
Author(s): Yoshiaki Sasaki; Hiroki Inage; Ryota Emori; Masaki Goto; Ryo Takahashi; Shinji Tanosaki; Tetsuya Yuasa; Hiroshi Taniguchi; Balasigamani Devaraj; Takao Akatsuka
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Paper Abstract

A reconstruction method for transillumination laser CT using optical heterodyne detection is proposed. Laser CT does not obey the Radon transform due to surface effects, which occur as results of refractive index mismatch and roughness of surface, and bring about annulus artifact and impair quantitative accuracy of a reconstructed image. Optical attenuation with surface effects is described using a model function with respect to an incident angle. This reconstruction produces a least squares problem incorporating the surface effect, which is solved via the conjugate gradient method. The method is applied to data from a acrylic physical phantom containing Intralipid-10% solution in various concentrations for demonstrating the effectiveness of the proposed method in terms of morphological and quantitative information. The CDI method is proved to have an excellent quantitative accuracy.

Paper Details

Date Published: 6 May 2004
PDF: 11 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.534495
Show Author Affiliations
Yoshiaki Sasaki, Yamagata Univ. (Japan)
Hiroki Inage, Yamagata Univ. (Japan)
Ryota Emori, Yamagata Univ. (Japan)
Masaki Goto, Yamagata Univ. (Japan)
Ryo Takahashi, Yamagata Univ. (Japan)
Shinji Tanosaki, Iwate Univ. (Japan)
Tetsuya Yuasa, Yamagata Univ. (Japan)
Hiroshi Taniguchi, Iwate Univ. (Japan)
Balasigamani Devaraj, New Focus, Inc. (United States)
Takao Akatsuka, Yamagata Univ. (Japan)

Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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