[Simnibs-discuss] Helmoltz-Like Coil_Simnibs Modelisation

Axel Thielscher axelt at drcmr.dk
Tue May 24 11:59:08 CEST 2022


yes, it's for a current flow of 1A. The origin and coil orienations are 
defined by the header information in the nifti (the qform/sform matrices 
- please keep them identical to avoid weird behaviors). It's a 6 DoF 
transformation between voxel indices and real world coordinates (in mm).

Best regards,


On 20-05-2022 10:57, Andres Carvallo Pecci wrote:
> Hello,
> I'm trying to model helmoltz-like coil (A-field) in matlab and then 
> transfer it to simnibs in the form of a compressed Nifti file.
> I did a discretization 2.5 mm as suggested in the 
> "Deng_Brain_Stim_2013" document (attached). My questions are the 
> following:
> 1) The A-field is calculated with a electric current equal to 1A?
> 2) In the simnibs program, where is the origin coordinate with respect 
> to the brain?
> My magnetic exposure is a helmoltz-like coil, stimulating the entire 
> brain, but it seems that in my simnibs simulation, I am doing 
> something wrong given that the simulated induced E-field is localized 
> in Cz.
> Thank you for your help.
> Andres
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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
Department of Health Technology
Technical University of Denmark
DK-2800 Kgs. Lyngby
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