A model for frequency dependence of conductivities of the live human skull

Massoud Akhtari, H. C. Bryant, D. Emin, W. Merrifield, A. N. Mamelak, E. R. Flynn, J. J. Shih, M. Mandelkern, A. Matlachov, D. M. Ranken, E. D. Best, M. A. DiMauro, R. R. Lee, W. W. Sutherling

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A mathematical model (σ(ω) ≈ Aωα, where, σ≡ conductivity, ω =2πf ≡ applied frequency (Hz), A (amplitude) and α (unitless) ≡ search parameters) was used to fit the frequency dependence of electrical conductivities of compact, spongiosum, and bulk layers of the live and, subsequently, dead human skull samples. The results indicate that the fit of this model to the experimental data is excellent. The ranges of values of A and α were, spongiform (12.0-36.5, 0.0083-0.0549), the top compact (5.02-7.76, -0.137-0.0144), the lower compact (2.31-10.6, 0.0267-0.0452), and the bulk (7.46-10.6, 0.0133-0.0239). The respective values A and α for the respective layers of the dead skull samples were (40.1-89.7, -0.0017-0.0287), (5.53-14.5, -0.0296-0.0061), (4.58-15.9, -0.0226-0.0268), and (12.7-25.3, -0.0158-0.0132).

Original languageEnglish (US)
Pages (from-to)39-55
Number of pages17
JournalBrain Topography
Issue number1
StatePublished - Sep 2003


  • Conductivity
  • EEG
  • MEG
  • Model
  • Skull

ASJC Scopus subject areas

  • Anatomy
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Neurology
  • Clinical Neurology


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