Article

Brain Topography

, Volume 13, Issue 1, pp 29-42

Conductivities of Three-Layer Human Skull

  • M. AkhtariAffiliated withDepartment of Physics and Astronomy, The University of New MexicoHuntington Medical Research Institute
  • , H.C. BryantAffiliated withDepartment of Physics and Astronomy, The University of New Mexico
  • , A.N.Mamelak MamelakAffiliated withHuntington Medical Research InstituteEpilepsy and Brain Mapping Program, Huntington Memorial Hospital
  • , L. HellerAffiliated withPhysics Division, Los Alamos National Laboratory
  • , J.J. ShihAffiliated withDepartment of Neurology, The University of New Mexico School of MedicineDepartment of Neurosciences, The University of New Mexico School of Medicine
  • , M. MandelkernAffiliated withDepartment of Physics, University of California at Irvine
  • , A. MatlachovAffiliated withPhysics Division, Los Alamos National Laboratory
  • , D.M. RankenAffiliated withPhysics Division, Los Alamos National Laboratory
  • , E.D. BestAffiliated withPhysics Division, Los Alamos National Laboratory
    • , W.W. SutherlingAffiliated withHuntington Medical Research InstituteEpilepsy and Brain Mapping Program, Huntington Memorial Hospital

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Abstract

In this study, electrical conductivities of compact, spongiosum, and bulk layers of cadaver skull were determined at varying electric fields at room temperature. Current was applied and withdrawn over the top and bottom surfaces of each sample and potential drop across different layers was measured using the four-electrode method. We developed a model, which considers of variations in skull thicknesses, to determine the conductivity of the tri-layer skull and its individual anatomical structures. The results indicate that the spongiform and the two compact layers of the skull have significantly different and inhomogeneous conductivities ranging from 0.76 ∓ .14 to 11.5 ∓ 1.8 milliS/m.

conductivity skull human inhomogeneity spongiosum compact layer