[FieldTrip] Problems with ft_prepare_headmodel

[Tzvetan Popov]

Dear Uri,

> That worked perfectly, thank you! Are there guidelines for use of mesh inflation?
no there aren’t any.
> E.g., does dilation by two voxels greatly bias source reconstruction?
no
> If one inflates a subject's mesh, must one then inflate all other subjects' meshes to the same degree? 
I would do as minimum as possible and only there when needed.
Best
tzvetan

> 
> Thank you again,
> Uri 
> 
> 2018-07-02 16:54 GMT+02:00 Tzvetan Popov <tzvetan.popov at uni-konstanz.de <mailto:tzvetan.popov at uni-konstanz.de>>:
> Dear Uri,
> 
> the solution to the problem (mesh inflation) is outlined in this tutorial: http://www.fieldtriptoolbox.org/tutorial/natmeg/dipolefitting?s[]=natmeg&s[]=headmodel#procedure <http://www.fieldtriptoolbox.org/tutorial/natmeg/dipolefitting?s%5B%5D=natmeg&s%5B%5D=headmodel#procedure>
> 
> Scroll down to the section "Construct the EEG volume conduction model"
>  <http://www.fieldtriptoolbox.org/tutorial/natmeg/dipolefitting?s[]=natmeg&s[]=headmodel#construct_the_eeg_volume_conduction_model>
> Good luck,
> tzvetan
> 
> 
>> Am 02.07.2018 um 14:37 schrieb Uri Eduardo Ramírez Pasos <urieduardo at gmail.com <mailto:urieduardo at gmail.com>>:
>> 
>> Dear Fieldtrippers,
>> 
>> I have followed the Salzburg tutorial (http://www.fieldtriptoolbox.org/tutorial/salzburg <http://www.fieldtriptoolbox.org/tutorial/salzburg>) to conduct EEG source reconstruction, but it doesn't work with some subjects' segmented mri files (whether I use dipoli or bemcp), due to intersections between surfaces. 
>> 
>> What are the typical trouble-shooting steps for this situation? I tried using a lower number of vertices for the mesh ([800 800 600]), to no avail. Are there any guidelines for the number of vertices? 
>> 
>> The number of subjects in my study is limited, so I would be loathe to exclude any subject from the analysis.
>> 
>> Best regards,
>> 
>> Uri Ramirez
>> University of Würzburg
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