[FieldTrip] Place Source Models in specific location

[Carsten Wolters]

Dear Ferehste,

we have implemented the Venant approach for FEM source modeling in the 
Fieldtrip-SimBio pipeline.
The Venant approach spreads monopolar sources around the dipole location 
in a way that
the dipole location and moment is well approximated. You need to take 
care that all these monopoles
are within the grey matter compartment. We call this the "Venant 
condition" that has to be fulfilled.

You find detailed informations in
http://www.sci.utah.edu/~wolters/PaperWolters/2014/VorwerkChoRamppHamerKnoescheWolters_NeuroImage_2014_Webversion.pdf
or in Chapter 2.4.2 in
http://www.sci.utah.edu/~wolters/PaperWolters/2016/PursiainenVorwerkWolters_PhysMedBiol_accepted2016_HDiv.pdf
or very detailed in
http://www.sci.utah.edu/~wolters/PaperWolters/2016/Vorwerk_Dissertation_2016.pdf

BR
      Carsten

Am 05.11.2017 um 12:05 schrieb Fereshte:
> I'm going to investigate the effect of segmentation on EEG forward 
> problem( FreeSurfer segmentation and Filedtrip segmentation). I've 
> already made the FE head model and placed the electrodes but I'm not 
> really sure how to place the source models for such a comparison ( 
> like to place source models where the two segmentations differ in GM).
> Thanks for your attention.
>
> On Sat, Nov 4, 2017 at 11:05 AM Schoffelen, J.M. (Jan Mathijs) 
> <jan.schoffelen at donders.ru.nl <mailto:jan.schoffelen at donders.ru.nl>> 
> wrote:
>
>     Ferehste,
>
>     Your question lacks specificity. I think the readers of this list
>     need a bit more concrete input in order to think about answering
>     your question. Is it about specific locations? Anatomical atlas
>     based regions-of-interest? What inverse algorithm are you
>     considering? Etc.?
>
>     Best wishes,
>
>     Jan-Mathijs
>
>     J.M.Schoffelen, MD PhD
>     Senior Researcher, VIDI-fellow - PI, language in interaction
>     Telephone: +31-24-3614793
>     Physical location: room 00.028
>     Donders Centre for Cognitive Neuroimaging, Nijmegen, The Netherlands
>
>
>
>
>>     On 4 Nov 2017, at 07:53, Fereshte <fereshte.ramezani at gmail.com
>>     <mailto:fereshte.ramezani at gmail.com>> wrote:
>>
>>     Dear Experts,
>>     I'm so new to fieldtrip so I apologize if my question is very
>>     basic; How can I place source models in specific locations
>>     according to MRI image ( I've already made the head model based
>>     on FEM).
>>     Thanks for your attention.
>>     Regards,
>>     Fereshte
>>     _______________________________________________
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>
>
>
>
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-- 
Prof. Dr.rer.nat. Carsten H. Wolters
University of Münster
Institute for Biomagnetism and Biosignalanalysis
Malmedyweg 15
48149 Münster, Germany

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

Fax:
+49 (0)251 83 56874

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

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