Hi,
I used tckmap
to create TDI maps from two different shells of the same subject.
I wanted to average these two maps but I got the error "[ERROR] Dimensions of image 1400_TDI.mif do not match those of first input image 700_TDI.mif"
then I used mrinfo
and realized that the dimension and transform are slightly different between the two maps.
Any idea why this happens? and in case that this is normal how I can average the TDI maps?
Thanks,
Mahmoud
This will most likely be due to your use of the -vox
option only in the tckmap
call. When that’s all it’s given, tckmap
will try to figure a suitable bounding box for the output image based on the track data (by default, the first 10k streamlines, from memory). Since the tractography is typically at least a bit random, the bounding box will generally come out slightly different for different tractograms.
To fix this, the simplest is probably to add the -template tdi1.mif
option to the second tckmap
call, where tdi1.mif
is the output of the first tckmap
call.