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Proceedings Paper

Pseudo-colored visualization of EEG-activities on the human cortex using MRI-based volume rendering and Delaunay interpolation
Author(s): Leonid I. Dimitrov
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Paper Abstract

A method for a pseudo-colored smooth representation of evaluated EEG parameters on a three-dimensional reconstruction of a proband's cortex is proposed. The EEG data are obtained through standard measurements and are subsequently Fourier analyzed in order to transform them to parameters representing the signals' power and coherence changes with respect to the averaged EEG at rest. The morphological data for the 3D-reconstruction of the brain is gained through MRI-scans of the head. The three-dimensional reconstruction of the cortex is achieved by means of a graylevel gradient shading method. During rendering, each brain surface voxel (volume element) is associated with a suitable parameter value determined through an inverse distance-weighted interpolation scheme from the values evaluated for its neighbors in the Delaunay triangulation mesh between the electrodes. Following the interpolation, a mapping of the calculated surface value in the HSV color space is employed in order to achieve an expressively colored brain surface with well perceptible distinct activation regions and smooth transitions between them. The presented method provides a possibility for direct, visual comparisons of the activated brain regions of a healthy individual.

Paper Details

Date Published: 27 April 1995
PDF: 10 pages
Proc. SPIE 2431, Medical Imaging 1995: Image Display, (27 April 1995); doi: 10.1117/12.207641
Show Author Affiliations
Leonid I. Dimitrov, Institute for Information Processing (Austria)

Published in SPIE Proceedings Vol. 2431:
Medical Imaging 1995: Image Display
Yongmin Kim, Editor(s)

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