Posted by B. Douglas Ward on March 12, 2001 at 10:34:19:
In Reply to: What effect has transformation to talairach grid on timeseries graphs posted by Florian Hauch on March 12, 2001 at 06:47:09:
Florian Hauch:
Have you tried using 3dfractionize to resample the mask from the Tlrc space
back to the Orig space? You could then apply this mask to the time series
data in the Orig space.
This has several advantages:
1. This reduces the memory required. As you pointed out, the Tlrc'ed 3d+time
dataset file is enormous.
2. This reduces the computation time. Since every original voxel is warped
to 40 voxels in Tlrc space, doing the time series analysis in Tlrc space
increases the processing time by about a factor of 40.
3. From a statistical point of view, it is much better to perform the analysis
on the original time series data, than on data that has been interpolated into
Tlrc space.
Doug Ward