[FieldTrip] Possible to combine FEM model with surface-based model of dipole locations?

Carsten Wolters carsten.wolters at uni-muenster.de
Tue May 4 14:52:59 CEST 2021

Dear George,

for the FEM:
 From Johannes (in CC) FieldTrip-SimBio paper
it doesn't get clear if a cortical surface source space or a volumetric 
one was used for the dipole scan, I only found
"In the call of /ft_prepare_sourcemodel/, a grid resolution of 2 mm was 
chosen for the source space."

In general, if you distinguish inner compartments such as white and grey 
matter and CSF, I would recommend
to combine it with a cortical surface source space, as done in most of 
our papers, see e.g. Section 2.5 in


Prof. Dr.rer.nat. Carsten H. Wolters
University of Münster
Institute for Biomagnetism and Biosignalanalysis
Malmedyweg 15
48149 Münster, Germany

+49 (0)251 83 56904
+49 (0)251 83 56865 (secr.)

+49 (0)251 83 56874

Email: carsten.wolters at uni-muenster.de
Web: https://campus.uni-muenster.de/biomag/das-institut/mitarbeiter/carsten-wolters/

Am 03.05.21 um 14:21 schrieb George Buzzell:
> Dear FSL Community,
> For source localization analyses (using individual MRIs), is there an 
> established workflow/approach in fieldtrip to model all aspects of the 
> inside of the head as volumetric (i.e. employ a FEM model) but 
> restrict the source model (dipole locations) to a surface-based model 
> of the gray matter (i.e. using fieldtrip)?
> My understanding is that there are two typical workflows for 
> conducting source localization:
>  1. Use of a FEM (volumetric) head model with a volumetric source grid
>     model
>  2. Use of a BEM (boundary/surface) head model with a surface-based
>     source model (created via free-surfer).
> I have traditionally employed approach #1 above. However, I am 
> wondering if it is possible to combine a FEM (volumetric) head model 
> with surface-based modelling of the gray matter (and dipole 
> locations). My reasoning for wanting to do this is that I would 
> presume that FEM allows for improved modelling of the way electricity 
> flows through the internal media of the head, but, a surface model for 
> dipole locations would lead to more accurate modeling of their 
> locations and orientations.
> I would be grateful for any comments, insights, links to resources 
> and/or example code. Also, if something is off in the way I am 
> thinking about this, please do let me know!
> Best,
> George
> -- 
> George A. Buzzell
> Assistant Professor
> Florida International University
> Lab website: www.NDCLab.com <http://www.NDCLab.com>
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> https://doi.org/10.1371/journal.pcbi.1002202

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