<div dir="ltr"><br><div>Hi Jesper, </div><div><br></div><div>Thank you so much for your reply. </div><div>The positions of EEG channels are scanned by the Captrak device after wearing EEG cap and we can know the actual coordinates of EEG channels.</div><div>The anatomical references of the Captrak system are Nz, Cz, LPA, and RPA.</div><div><br></div><div>I thought I need to consider and fit the reference points properly when I transfer the Captrak coordinates to the MNI Coordinate to use in SimNIBS against than simple transforming of coordinates.</div><div>I wonder if my concern makes sense to you? </div><div><br></div><div>Thank you! </div><div><br></div><div>Best, </div><div>Kyu </div><div> </div><div> </div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">2022년 7월 29일 (금) 오후 5:09, Jesper Duemose Nielsen <<a href="mailto:jesperdn@drcmr.dk">jesperdn@drcmr.dk</a>>님이 작성:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p><font size="2"><font face="Victor Mono">Hi Hyoungkyu Kim</font></font></p>
<p><font size="2"><font face="Victor Mono">Let me first apologize
for the late reply!</font></font></p>
<p><font size="2"><font face="Victor Mono">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, </font></font><font size="2"><font face="Victor Mono"><font size="2"><font face="Victor Mono">`subject2mni_coords`</font></font> will
apply the nonlinear deformation obtained during the
segmentation. Does this do what you want?</font></font></p>
<p><font size="2"><font face="Victor Mono">Best,</font></font></p>
<p><font size="2"><font face="Victor Mono">Jesper</font></font></p>
<div>On 7/1/2022 6:39, 김형규[ 교수 / 뇌공학연구소 ]
wrote:<br>
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<div dir="ltr"><br>
<div>To whom it may concern, </div>
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>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 (<a href="https://brainvision.com/products/captrak/" target="_blank">https://brainvision.com/products/captrak/</a>).
<b style="background-color:rgb(255,255,255)"><font color="#ff0000">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. </font></b></div>
<div><b style="background-color:rgb(255,255,255)"><font color="#ff0000"><br>
</font></b></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000">It will be really helpful to me if I can
have any advice from you.</font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000">Thank you so much and have a great day! </font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000"><br>
</font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000">Best,</font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000">Hyoungkyu Kim </font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000"> </font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000"> </font></span></div>
<div><span style="background-color:rgb(255,255,255)"><font color="#000000"> </font></span></div>
<div><b style="background-color:rgb(255,255,255)"><font color="#ff0000"><br>
</font></b></div>
</div>
<br>
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