[Simnibs-discuss] Coil orientation adjustment

[Oula Puonti]

Hi Jack,

Maybe the easiest way to do this over multiple subjects is to pick an
EEG position on the scalp which is close to the 45 degree angle, for
example C1 as the center and FCz as the direction. I noticed that
there's not a dropdown menu for choosing the direction based on the EEG
positions on the GUI, but you can do that when using scripting, see:

https://simnibs.github.io/simnibs/build/html/tutorial/scripting.html

Best,
Oula


On Wed, 2023-03-29 at 14:33 +0800, Jack ZHANG wrote:
> Hi SimNIBS developers and users,
> 
> I'd like to ask a question regarding the definition of coil
> orientation during the TMS simulation.
> 
> Clinically, a 45-degree angle is always applied during the
> stimulation of M1.
> 
> When adding a stimulation target, e.g., C1 (-39.84,-62.80, 68.01),
> the reference coordinate is automatically set as  (-39.84,-52.80,
> 68.01). Under this condition, the coil points anteriorly.
> 
> Then if I set the reference coordinate on (-29.84, -52.80, 68.01), it
> seems the coil is pointing 45-degree in a P-to-A manner. 
> 
> I would like to confirm if this method is acceptable (in order to
> have a 45-angle manually), as it doesn't take the Z axis into
> consideration. In addition, when adjusting the Z coordinates, it does
> not change the tilting angle of the coil (it seems the coil is always
> placed perpendicular to the scalp), but it can produce different
> pointing directions.
> 
> Thanks for your attention on this matter,
> Best regards,
> Jack
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