Dear Prof Ashburner and SPM users
Dear SPM users,
By searching your weblist, I have been able to find a program where I can
input a given set of coordinates in the warped image and get the
corresponding coordinates in the source image (using normalise).
What I would like to do is the opposite: to input the coordinates in the
source image and get the corresponding ones in the warped image. I have
spent a lot of time trying to invert the transformations in the program,
but have not succeeded because I don't really know how to "invert" the
transformations in the non-linear part (the Tr matrix). Does anyone have any
ideas?
Best wishes,
Mustafa
On Sun, 15 Jun 2008 17:31:56 +0100, Mustafa Anjari
<[log in to unmask]> wrote:
>Dear SPM users
>
>Thank you very much for your help. Yes, I used the normalise tool to
>register an EPI to a T2 image from the same subject. The transformed image
>looks good. I now want to apply this transformation to landmarks (in world
>coordinates) that I had placed on the unregistered EPI and see where they
>end up. I’ve tried using your code (get_coord_orig.m), but I don’t get
>plausible results. For example, the point [0, 0, 0] gets mapped to around
>[120, 120, 58], which makes me think there is a problem with where the
>origin is defined in the images. Also, can you explain what information is
>contained in the transformation (Tr) matrix that is given as an output of
>the normalise tool, please?
>
>I am also unsure about the dimensions to include for the bounding box. Why
>is it defined from the anterior commissure? Where do the default values
>come from?
>
>Thanks again. Best wishes,
>Mustafa
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