Dear SPM5b users
I have done optimised VBM with SPM5b and trying to compute
the volumes of GM/WM/CSF segments.
But, in SPM2 the Nvox value can be capture in the graphic window
after segmentation. In SPM5b the Nvox do not appear neither in the
graphic window nor in .mat or .ps file.
Therefore I used the following script from John Ashburner:
V = spm_vol(spm_get(1,'*_seg*.img'));
vol = 0;
for i=1:V.dim(3),
img = spm_slice_vol(V,spm_matrix([0 0 i]),V.dim(1:2),0);
vol = vol + sum(img(:));
end;
fprintf('%g voxels, %g litres\n', vol, vol*det(V.mat(1:3,1:3))*1e-6);
but it does work well with all segmented images except the modulated ones in
SPM5b.
With the modulated segments it does not work and there is no error message.
The result is:
NaN voxels, NaN litres
Where is the problem? What does it mean?
Thanks a lot in advance
Best regards
Juergen
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Juergen Haenggi, Ph.D. student
Division of Psychiatry Research
Psychiatric University Hospital
University of Zurich, Switzerland
P.O. Box 1931
Lenggstrasse 31, 8032 Zurich
0041 44 384 26 10 (office phone)
0041 76 445 86 84 (mobile phone)
0041 44 384 26 86 (fax)
H 115 (office room number)
[log in to unmask] (division email)
http://www.dpr.unizh.ch/ (division website)
http://www.juergenhaenggi.ch (private website)
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