[Simnibs-discuss] Using Captrak coordinates for the optimization

Jesper Duemose Nielsen jesperdn at drcmr.dk
Fri Jul 29 10:09:31 CEST 2022

Hi Hyoungkyu Kim

Let me first apologize for the late reply!

I assume you (perhaps as part of the Captrak system?) have a way of 
coregistering between captrak coordinates and MRI coordinates (e.g., 
based on fiducials)? If so, and you want the coordinates in MNI space, 
then you could use the function `subject2mni_coords` once you have 
created a headmodel using headreco (simnibs 3) or charm (simnibs 4 
beta). By default, `subject2mni_coords` will apply the nonlinear 
deformation obtained during the segmentation. Does this do what you want?



On 7/1/2022 6:39, 김형규[ 교수 / 뇌공학연구소 ] wrote:
> To whom it may concern,
> Hello, I am Hyoungkyu Kim, a research professor in the brain 
> engineering department at Korea University. First of all, I really 
> appreciate using your great program, SimNIBS, for my research. The 
> completion of the program is amazing and the tutorials are easy to 
> understand.
> Our team is planning to measure EEG and fMRI during the memory task 
> (sternberg test) under the tES stimulation, and I think SimNIBS is a 
> perfect solution to optimize the stimulation by using a personal T1 
> image. I checked I can use personalized coordinates in the calculation 
> of the leadfield, and I have the coordinates of Captrak 
> (https://brainvision.com/products/captrak/). *I wonder if I can have 
> the codes or information transforming Captrak coordinates to MNI 
> coordinates (or to other coordinates) because I have not much 
> experience with the registration between two different coordinates 
> properly. *
> *
> *
> It will be really helpful to me if I can have any advice from you.
> Thank you so much and have a great day!
> Best,
> Hyoungkyu Kim
> *
> *
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