That is not what Bruce is suggesting. Try to register the post-op to the
pre-op using bbregister. You can then map the pre-op surfaces to the
post-op brain
On 10/29/2014 01:58 PM, Pierre Mégevand wrote:
> Unfortunately, our pre-implant MR was acquired with double-dose
> gadolinium and we can't
Unfortunately, our pre-implant MR was acquired with double-dose gadolinium
and we can't seem to extract the pial surface from it.
have you tried using bbregister to register post-op MRI with the pre-op
surfaces?
On Wed, 29 Oct 2014, Pierre M?gevand wrote:
> Our usual method for electrode localiz
have you tried using bbregister to register post-op MRI with the pre-op
surfaces?
On Wed, 29 Oct 2014, Pierre Mégevand wrote:
Our usual method for electrode localization remains in the patient's space:
co-register post-op MR and CT with pre-op MR brainmask (our reference space)
and snap electro
Our usual method for electrode localization remains in the patient's space:
co-register post-op MR and CT with pre-op MR brainmask (our reference
space) and snap electrodes to patient's outer pial surface.
My idea was: register the patient's (crappy) brainmask volume to the
"Talairach" fsaverage v
So what I don't get in your pipeline is how you'll register the post-op brain
to fsaverage if you don't have any cortical surface in the post-op?
If I were you, if you want precise registration that includes the sulci, I'd go
with the white surface from the pre-op gadolinium scan. And if you ju
You're right, we can't use the post-op surface because of the deformation
caused by surgery and the electrode artifacts.
Getting a surface right from the brainmask would be OK, if we can't get
anything better, but the nice thing about using the fsaverage surface is
that you can plot and compare el
Hi Pierre,
Tricky question. So you can't really use the post-op cortical surface for this
participant, right? Otherwise I would simply use the outer smoothed pial for
this subject directly, which would be much more similar to the pre-op than the
outer surface from the fsaverage (?). Otherwise,
Thanks Marie. Here is what I'm trying to do. In fact, all I need from LGI
are the first few steps, until ?h.pial-outer-smoothed has been generated.
I'm not actually interested in the local GI for fsaverage.
Our intra-cranial electrode localization method relies on post-implant CT
and MRI scans to
It does not surprise me that it fails on the fsaverage surface. I agree
with Marie that it is not good idea to use LGI on fsaverage for
anything. Definitely not its intended purpose.
doug
On 10/28/2014 03:06 PM, Marie Schaer wrote:
>
> Hi Pierre,
>
> I'm not sure exactly what you are trying to
Hi Pierre,
I'm not sure exactly what you are trying to do, but it's true that LGI fails
for fsaverage at the mris_fills step, where the volume looks "cut". It seems to
be something in the properties of the fsaverage surfaces. Maybe Doug or Bruce
have an idea where it comes from.
But in any ca
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