Effects of the local skull and spongiosum conductivities on realistic head modeling

Bashar, M. R. and Li, Y. and Wen, P. (2010) Effects of the local skull and spongiosum conductivities on realistic head modeling. In: 2010 IEEE/ICME International Conference on Complex Medical Engineering (CME 2010), 13-15 Jul 2010, Gold Coast, Australia.

Abstract

In the most head modeling, the skull tissues are considered either homogeneous, inhomogeneous or anisotropic conductive medium due to its anatomical structure. The skull consists of two dense, poorly conducting compact bone separated by a spongiosum region containing blood. The spongiosum tissues are sandwiched by compact tissues. The major part of the skull remains the spongiosum tissues. The structure of the compact and spongiosum tissue layers is not identical which makes the coarse anatomical structure and conductivity variations. The conductivity of the spongiosum tissue changes with changing the thickness of the skull and the internal blood vessels. Accounting the skull thickness, considering the variable spongiosum conductivity, we consider local conductivity for the skull. We develop a realistic head model assigning the local skull conductivity (LSC), inhomogeneous anisotropic conductivity and perform forward computation to show the effects of the skull conductivity on EEG. Our simulated results show that 3% ± 1% average relative distance measurement (RDM) and 0.998 ± 0.02 magnification (MAG) values are obtained from LSC model. We also find 2% ± 0.3% RDM and no MAG errors for inhomogeneous anisotropic model. We then vary the conductivity of the spongiosum from -2 to +2 times the reported conductivity and compute EEGs. We find the maximum 4% RDM and 1.004 MAG values by varying the spongiosum conductivity.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Depositing User: Dr Yan Li
Faculty / Department / School: Historic - Faculty of Sciences - Department of Maths and Computing
Date Deposited: 14 Nov 2010 11:54
Last Modified: 08 Oct 2014 01:05
Uncontrolled Keywords: anatomical structures; anisotropic conductivity; anisotropic models; compact bone; conductive medium; conductivity variation; corward computation; head modeling; realistic head models; simulated results; skull conductivity; tissue changes; tissue layers anisotropic media; anisotropy; biomedical engineering; blood; blood vessels; bone
Fields of Research (FOR2008): 10 Technology > 1004 Medical Biotechnology > 100402 Medical Biotechnology Diagnostics (incl. Biosensors)
09 Engineering > 0903 Biomedical Engineering > 090303 Biomedical Instrumentation
11 Medical and Health Sciences > 1109 Neurosciences > 110999 Neurosciences not elsewhere classified
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: doi: 10.1109/ICCME.2010.5558877
URI: http://eprints.usq.edu.au/id/eprint/8866

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