[FieldTrip] Headmodel with NeuroScan meshes

[Alexandre Gramfort]

hi Imali,

your meshes had indeed tiny problems. To fixed it I just smoothed a tiny
bit the meshes.

In matlab:

>> load innerSkull
>> om_save_tri('innerSkull.tri', curryloc', currytri');

then :

$om_mesh_smooth -i innerSkull.tri -o innerSkull_sm.tri -n 2
$om_mesh_convert -i innerSkull_sm.tri -o innerSkull_sm_flip.tri -invert
$ om_mesh_info -i innerSkull_sm_flip.tri
om_mesh_info version 2.2.dev (exported) compiled at Mar  7 2012 15:37:20

load_tri : innerSkull_sm_flip.tri
Mesh Info :
# points : 2934
 # triangles : 5864
Euler characteristic : 2
Min Area : 6.55783
 Max Area : 28.9211
Mesh orientation correct (valid for closed mesh).

this should fix the problem. Note that you can surely also smooth the
meshes in matlab.

Alex
-- 
Alexandre Gramfort, PhD
alexandre.gramfort at inria.fr
INRIA Parietal Project Team, NeuroSpin CEA Saclay
Bat. 145, PC 156
91191 Gif-sur-Yvette, France
http://alexandre.gramfort.net

On Tue, Jun 12, 2012 at 3:25 AM, IMALI THANUJA HETTIARACHCHI <
ith at deakin.edu.au> wrote:

>  ** **
>
> Dear FieldTrip users,****
>
>  ****
>
> As I have faced problems in creating a head model with MRI's, so I thought
> to try the MNI head for creating the meshes. I used the NeuroScan software
> to create the surface meshes and exported them to Matlab. Then tried to
> crate the head model using ft_prepare_headmodel function.  however the
> 'om_minverser' stops working and the program terminates.****
>
>  ****
>
> When I plot the meshes they seem fine to me so I assume that there is no
> segmenting issues. But Now I get an error as attached in the 'log.txt' from
> the Matlab workspace, which says about self intersecting meshes. I have
> attached the Neuroscan exported meshes
> (innerSkull.mat,outerSkull.mat,skin.mat) and the Matlab function
> (m_file.txt) that I used in creating the head model.****
>
>  ****
>
> I really want to generate some simulated EEG data but cannot make anything
> work. If someone can give a guidance on where I am going wrong in the
> procedure , that will be highly appreciated.****
>
>  ****
>
> Many thanks.****
>
>  ****
>
> Kind regards****
>
> Imali****
>
> ** **
>
> *Imali Thanuja Hettiarachchi*
>
> PhD Candidate****
>
> Centre for Intelligent Systems research****
>
> Deakin University, Geelong 3217, Australia.****
>
> ** **
>
> Mobile : +61430321972****
>
> Email: ith at deakin.edu.au
> www.deakin.edu.au/cisr****
>
> ** **
>
> [image: Description: Description: Description:
> cid:1216BE20-1800-4A47-8B9F-E7B9D94831CD at deakin.edu.au]****
>
> ** **
>
>
>
> ****
>
> ** **
>
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-- 
Alexandre Gramfort, PhD
alexandre.gramfort at inria.fr
INRIA Parietal Project Team @ NeuroSpin CEA Saclay
Bat. 145, PC 156
91191 Gif-sur-Yvette, France
http://www-sop.inria.fr/members/Alexandre.Gramfort/
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