Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Office: (773) 406-2464
=====================
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On Thu, Nov 24, 2011 at 9:25 AM, Glen Lee
<[log in to unmask]> wrote:
Dear SPM experts,
I'm a novice SPM user and learning by doing.
So, I'm comparing the header information of a bold image (e.g., bold1_0000.nii) before and after realignment.
As can be seen below, the matrix has been changed after realignment for the same given file.
>> Vol_pre=spm_vol('bold1_0000.nii');
>> Vol_pre.mat
ans =
3.0000 0 0 -123.0000
0 3.0000 0 -123.0000
0 0 3.5000 -53.5000
0 0 0 1.0000
>> Vol_post=spm_vol('bold1_0000.nii');
>> Vol_post.mat
ans =
3.0000 0.0041 0.0054 -123.9010
-0.0041 3.0000 0.0141 -147.7564
-0.0046 -0.0121 3.5000 -54.6400
0 0 0 1.0000
However, I don't know what information this 4 x 4 matrix contain. Any help would be appreciated.
Also, what else in the header information is changed after the realignment?
Thanks,
Glen
