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Proceedings Paper

Reflectance-type image reconstruction algorithm for time-resolved optical tomography of cerebral hemodynamics
Author(s): Feng Gao; Yukari Tanikawa; Huijuan Zhao; Yukio Yamada
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Paper Abstract

Optical imaging can be used for localizing the oxygenation changes in the cortex in response to certain stimuli such as visual or sensory tasks, with the advantages of flexibility to subject's movement as well as being cheap and very fast. Up to now, data from optical imager is simply presented as a two-dimensional (2-D) topographic map rather than being tomographically reconstructed onto the cerebral cortex, based on the assumptions that the optical properties beneath each optode pair are homogeneous and the modified Beer-Lambert law can be used. Due to the high heterogeneity of optical properties in the brain, the above assumptions are evidently invalid, leading to both low spatial resolution and inaccuracy in the assessment of hemodynamic changes. To solve the problem, we propose a nonlinear image reconstruction algorithm for a two-layered slab geometry using time-resolved reflected light and demonstrate its advantages in quantifying simulated changes in hemoglobin concentrations. The algorithm is based on the previously developed generalized pulse spectrum technique, and implemented within a semi three-dimensional (3D) framework, where the changes of optical properties assumed invariable in depth, to conform to the topographic visualization and to reduce computational load. We also investigate the robustness of the algorithm to the uncertainties in the cortical structure and optical properties.

Paper Details

Date Published: 29 July 2003
PDF: 11 pages
Proc. SPIE 4955, Optical Tomography and Spectroscopy of Tissue V, (29 July 2003);
Show Author Affiliations
Feng Gao, National Institute of Advanced Industrial Science and Technology (Japan)
New Energy and Industrial Technology Development Organization (Japan)
Yukari Tanikawa, National Institute of Advanced Industrial Science and Technology (Japan)
Huijuan Zhao, National Institute of Advanced Industrial Science and Technology (Japan)
Yukio Yamada, Univ. of Electro-Communications (Japan)
National Institute of Advanced Industrial Science and Technology (Japan)

Published in SPIE Proceedings Vol. 4955:
Optical Tomography and Spectroscopy of Tissue V
Britton Chance; Robert R. Alfano; Bruce J. Tromberg; Mamoru Tamura; Eva M. Sevick-Muraca, Editor(s)

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