Forward model conductivities

[Dr. Carsten Wolters]

Dear Paul,

head tissue conductivities seem to have a larger inter- and
intra-subject variability.
I attachted a 4-page-proceedings paper with regard to those issues that
we recently presented :
@InProceedings{CHW:Wol2010,
  author =       "C. H. Wolters and S.Lew and R. S. MacLeod and M. S.
H{\"a}m{\"a}l{\"a}inen",
  title =        "Combined {EEG/MEG} source analysis using calibrated
finite element head models",
  booktitle =    "Proc. of the 44th Annual Meeting, DGBMT",
  address =      "Rostock-Warnem{\"u}nde, Germany, Oct.5-8, 2010",
  year =         "2010",
  note =         "http://conference.vde.com/bmt-2010",
}

Best regards
   Carsten

Paul Czienskowski wrote:
> Dear all,
>
> Alexandre Gramford pointed out to me that there was some discussion
> ongoing on which conductivities to use for EEG-Forward-Modeling and
> I'd like to move this discussion more to public for it could be
> interesting for many of us.
> I was recently overflying some papers concerned with that very issues
> and I made some interesting and discoveries, especially in
>
>     Conductivity of living intracranial tissues. by Latikka J, Kuurne
>     T, Eskola H.
>     The electrical conductivity of human cerebrospinal fluid at body
>     temperature by Baumann et al.
>
> The first one measured the conductivities (or resistivities) of living
> brain tissue and came to values of 3.51 Ohms*m and 3.91 Ohms*m for
> grey respectively white matter and 0.80 Ohms*m for the CSF (which are
> about 0.28, 0.256 and 1.25 S/m). In contrary the second one found a
> value for 1.79 S/m for CSF at body temperature where it was about 1.4
> S/m at room temperature. The Skull-To-Brain conductivity ratio was
> measured for example in
>
>     Estimation of /in vivo/ brain-to-skull conductivity ratio in
>     humans by Yingchun Zhang, Wim van Drongelen, and Bin He
>
> where they found a ratio of about 1/18.7 which is way larger than the
> commonly assumed value.
>
> I would appreciate very much if many of you could contribute to this
> discussion by telling us which values you use for the conductivities
> and on which publications the are based.
>
> Best,
> Paul
> --
> Paul Czienskowski
> Max Planck institute for human development
> Lentzeallee 94
> 14195 Berlin
>
> Björnsonstr. 25
> 12163 Berlin
>
> Tel.: (+49)(0)30/221609359
> Handy: (+49)(0)1788378772
>
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>


--
PD.Dr.rer.nat. Carsten Wolters
Institute for Biomagnetism and Biosignalanalysis
University of Muenster, 48149 Muenster, Germany
Tel.: +49/(0)251-83-56904
Fax:  +49/(0)251-83-56874
http://biomag.uni-muenster.de


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