Hi everybody,
I wanted to co-register a functional image and an anatomical image,
the functional image is a 4D NIfTI image and the anatomical image is a
3D NIfTI image. I selected the anatomical image as the "reference
image" and wanted to specify all the volumes in the functional image
in the "source image", but it allowed me to select only one volume, so
I selected the rest of the volumes using the "Other Images" option and
the module ran without producing an error. Now the problem is, it
generated an output file which is 389MB while the input file was just
24.4MB. Why has SPM produced such a large image while the input file
was just 24.4MB? Earlier I ran slice time correction, "realign and
unwarp" modules, and there the output images produced were of the same
size as the input images.
In the second try I did not select any images in the "Other Images"
option, and the other options being,
Reference Image - anatomical.nii,1
Source Image - functional.nii,1
It generated a 3D NIfTI image(required is 4D) with just 1 volume with
the size of the file 4MB, while the space required for storing just
one volume would be around 500KB and not in MB.
Am I missing something here? Or am I doing it the wrong way?
I have a set of functional images (a set of 4D NIfTI images) which I
want to co-register with the anatomical image.
Thanks in advance,
Anoop Jacob Thomas
Research Scholar,
Computer Science & Engg. Dept.
Indian Institute of Technology Ropar.
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