[Simnibs-discuss] coil positioning in simnibs 3.2.6

[Grace Hallenbeck]

Dear simnibs crew,

Hello! My name is Grace Hallenbeck and I'm a post-doc working with Clay
Curtis (cc'ed here) at NYU. We're interested in using simnibs to model the
effects of TMS and today we've been trying to correctly position the coil
orientation in the simnibs gui but are having some difficulty.

We have a coordinate of interest that we're plugging in for the x,y,z
'Position' fields. But we're unclear on the best way to work with the
'Direction Reference' coordinates, which is what we think controls the coil
orientation. In the screenshot below, I've plugged in the same x,y,z coords
as in 'Position', but this has the coil handle (as I understand, 180 deg
opposite the green line) pointing slightly off the coil orientation we
actually applied TMS at with this subject (what we are attempting to
model).

So our question is: how can we finely modulate the coil orientation,
keeping the 'Position' x,y,z coords constant? We would greatly appreciate
any help on this as we're getting a publication ready and hope to include
some modeling results.
[image: Screen Shot 2022-04-15 at 12.32.29 PM.png]

All the best & thanks for your work,

Grace Hallenbeck
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