Dear Elena,
On Thu, 26 May 2016 13:19:14 +0200, Elena Bassanelli <[log in to unmask]> wrote:
>Dear SPM users,
>I'm writing you to ask some clarification about the segmentation in cat12.
>I'm doing a VBM on children from 3 to 8 years old, and I have some problem
>whit some scans.
>As I read in previous emails in the archive I have replaced the TPM whit a
>customized one (I have done it whit TOM8 toolbox).
>My problem is that some image's segmentation in the native space doesn't
>correspond to the space of the original scan, while other images do. Why?
>Also there are three possibility to segment images: native space, modulated
>and normalized, and dartel export, which are the differences between them
>(in particular the last two)?
Segmentations in native space should correspond to your original T1 images that are also in native space. I could send you an upload link where you can upload one of these datasets and the respective batch file.
Regarding the different spaces:
native space - same space as original image
normalized - space after spatial registration (non-linear warped), same space as DARTEL template
modulated - normalized and corrected for volume changes due to spatial normalization
dartel export - affine (12 parameters) or rigid (6 parameters) registered images; this is the input for an optional DARTEL registration with the DARTEL toolbox, Here I suggest to use affine registered images because less deformations are necessary to create a customized DARTEl template
The modulated normalized images are used for a straight-forward VBM. If you have children data I suggest to save the affine registered images (dartel export) and use them in the additional process of creating a customized DARTEL template.
Best,
Christian
>I apologize for my english, and thank you all for any help.
>Elena
>
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