Dear SPM users
this qustion is related to the email with the title
"Confusion about segment volume".
Although the matrix from affine registration looks well
in the graphic window of spm2 after normalisation
e.g.
X1 = 1.040*X + 0.017*Y + 0.002*Z - 2.018
Y1 = -0.002*X + 1.038*Y - 0.021*Z + 5.779
Z1 = -0.011*X - 0.028*Y + 1.234*Z - 0.272
but when I open the file *.sn.mat in the MATLAB workspace and then the file
affine the same matrix looks like
e.g.
-0.984652397319312 -0.01601706430295645 -0.002118768348360404
201.0153957960537
0.009009810452331476 -0.40483913770032703 -0.7711390007527495
192.507048140182
-9.784690721137174E-4 -0.48843170079109083 0.16698600269962102
100.13643261690986
0.0 0.0 0.0
1.0
As you can see the parameters in the matrix have changed from the graphic
window to the affine file and the calculated determinant looks very strange!
Where is the problem?
Thanks a lot for helpimg 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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