Dear List,
I have two questions about the matrix obtained from segmentation/normlisation in SPM5.
1. I have read before in the list it says the spatial scaling factor in the normalisation process can be obtained by cubed square root of determinant of Affine element in the *sn.mat. For one of my image I had:
load sDLPFC10-0031-00001-000160-00_seg_sn.mat
det(Affine).^(1/3)
ans =
3.2254
It looks very big to me and I even had something over 4 for other images. Is it right?
2. Is there any way to apply *sn.mat to a single voxel coordinate in the native space image to get the coordinate in normalised space (this is the same image that was used to obtain the *sn.mat file)?
Thanks in advance for any help.
Jian
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