[FieldTrip] Editing Vertices of Scalp Manually or Automatically

[Stolk, A. (Arjen)]

Hi Isaiah, It could be that your problem is caused by your structural scan containing voxels outside the head but with levels of intensity falling in the range of that attributed to, say, csf. One way to check is by plotting the respective segmented brain mask, e.g. mri.pow = seg.csf cfg.funparameter = 'pow' ft_sourceplot(cfg,mri) You could then try and manually include certain voxels by playing with the inclusion threshold (e.g. set seg.csf with voxelvalues smaller than .99 to 0). This would allow to work around that problem, unless those voxels have exactly the same intensity as csf. Hope this helps narrowing the origin of your problem, Arjen ----- Oorspronkelijk bericht -----
> Van: "Isaiah C. Smith" <Isaiah.C.Smith.17 at dartmouth.edu>
> Aan: fieldtrip at science.ru.nl
> Verzonden: Maandag 14 juli 2014 23:28:59
> Onderwerp: [FieldTrip] Editing Vertices of Scalp Manually or
> Automatically
> Hello Everyone,
> I am having a problem with noise appearing in my volume conduction
> model. There are a few horn-like images on the head, and a cluster of
> vertices in the area where a neck would normally appear but the MRI
> was only of the upper half of someone's head so it should not be
> appearing either. I am running into a wall when I try to edit manually
> because the data so large I cannot view it. Please, I have been trying
> to fix this for a while does anyone have any ideas on how to get rid
> of these extraneous points: whether manually or by shifting parameters
> in the segmentation process? Your help would be extremely helpful and
> greatly appreciated.
> This is an image of the problem described.
> Kind Regards,
> Isaiah
> ***************************
> Isaiah Smith ( Dartmouth Undergraduate)
> UCLA California NanoSystems Institute Summer Intern
> University of California Los Angeles
> Dr. Wentai Liu’s Biomimetics Lab
> Rm 5311
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> fieldtrip at donders.ru.nl
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-- Donders Institute for Brain, Cognition and Behaviour Centre for Cognitive Neuroimaging Radboud University Nijmegen Email: a.stolk at donders.ru.nl Phone: +31(0)243 68294 Web: www.arjenstolk.nl
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