Chapter 2 (Section 2.3) of http://www.fil.ion.ucl.ac.uk/spm/doc/books/hbf2/
may help you here. Note that if an image does not have a .mat file, then SPM
will try to read as much information as possible from the .hdr, in order to
generate a similar transform.
Best regards,
-John
On Friday 07 October 2005 17:09, Nicolas Wotawa wrote:
> Dear All,
>
> I wonder how I can invert the transformation due to a .mat file (the
> famous transformation eventually linked to the .hdr/.img files). I
> could not find this information neither in the archives nor in the help.
>
> More specifically, my problem is the following:
>
> - Input data:
> i1 with its transformation matrix M1 (i.e.M1 = the 4x4 matrix M
> when I do in matlab: load 'i1.mat')
> i2 with its transformation matrix M2
>
> When applying a chek_reg of both images, the coregistration is correct.
>
> - Pb: how can I compute the matrix M3 such that i1 with the
> transformation matrix M3 will be registered with i2 *without* its M2
> matrix (i.e. in matlab: M2=eye(4)).
>
> Thank you very much for your hints.
>
> Nicolas.
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