Combination of multiple transformation

[pinel]

Hi,
I would like to use fMRI activation as starting point for fiber tracking.
I then have :
-a transformation from my normalized cluster to the original T1
-a tranformation from my original T1 to ACPC

I would like to use both as a 'starting point transformation' in the DTI Tracking box. But I think that we could specify only one transformation file.
How could I do that ?

Philippe

[Manik]

Using the command line tools you have AimsComposeTransformation which can compose .trm files.

Code: Select all

AimsComposeTransformation -o output.trm -i firstTransfo.trm secondTransfo.trm

I don't know if there is a BrainVisa process available to do that.

[Jean-Francois Mangin]

Maybe the simplest way to do it is to normalize the T2-weighted image you get from the diffusion-based dataset, and use the result as the link with your normalized cluster. Do this normalization with SPM using a EPI T2 template. This approach is even mandatory if you did not correct the diffusion dataset for EPI-based distortions relative to the high resolution T1 (this correction has to be done using a phase map, like for BOLD-weighted data...).

Hope we will simplify this soon, hidding all this mess deep behind the tracking tools...