[Simnibs-discuss] Calculation Magnetic Field

[Kristoffer Madsen]

Hi Christian, I still not entirely sure why you need to show the
(dA/dt) / (dB/dt) field (which
would be independent of the head model). However, do you only have a
nifti file or can you
use a dipole expansion .ccd file? From the dipole expansion you can
easily calculate the B field at any desired point (this would be
easier and you would simply need to calculate the field for all
desired points in the mesh). If you do need it from the nifti file
then I'd calculate the curl of dA/dt on the grid like you are doing
and then interpolate to points in the mesh. I think I have some code
to do this (likely python though) if that can be helpful for you.
Best,
Kristoffer


On Fri, 19 Mar 2021 at 09:12, Christian Heinesch
<heinesch at rhrk.uni-kl.de> wrote:
>
> Hello,
>
> I apologize for asking another question here in my concern.
>
>
>
> I want to determine the dB/dt field at TMS from the magnetic vector field dA/dt. For this I have successfully converted the gmsh file to a nifti file. Now I wanted to have the nifti file with the A field read into Matlab and then calculate the rotation of A here. However, the required volume is 4d of size 256x256x256x3 and has too many elements to display.
>
>
>
> Can you please help how I can calculate the magnetic field here and then convert it back to a gmsh file? I would be very happy to receive an answer.
>
>
>
> With kind regards
>
> Christian Heinesch
>
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