[Simnibs-discuss] tDCS optimization with --no-cat headmesh

[Axel Thielscher]

Hi Lena,

the distributed optimization requires that you have a cortical surface 
reconstruction.

The other optimization methods will still work without surfaces, even 
though you will have to update the scripts for leadfield creation and 
optimization to specify that you want to use volume information instead 
surfaces.

Best regards,

Axel

On 05-06-2022 22:30, Lena Kuczka wrote:
> Hello,
>
> I am trying to simulate an optimized tDCS montage for a distributed 
> target, but have encountered a problem in the last step of the process.
>
> I've manually edited the segmentation masks to include a lesion I 
> segmented separately, so I don't use CAT12 for meshing. Unfortunately 
> when I know run the simulation with that head mesh, I get this error:
>
>     numpy.linalg.LinAlgError: Singular matrix
>
> This only happens for meshes created with headreco all --no-cat, as 
> far as I'm aware. Could that be a problem with the leadfield or am I 
> missing something?
>
> Thank you in advance,
> Lena
>
>
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-- 
Dr. Axel Thielscher
Professor of Neurophysics and Neuroimaging
Danish Research Center for Magnetic Resonance
Copenhagen University Hospital Hvidovre
DK-2650 Hvidovre, Denmark
www.drcmr.dk
&
Department of Health Technology
Technical University of Denmark
DK-2800 Kgs. Lyngby
http://www.healthtech.dtu.dk/