I'm not sure what it is that you need. Do you need seed coordinates in the native DTI space of each subject or in MNI space? If MNI, which one, mni152 or mni305? Do you need the coordinates in xyz or row,col,slice? Or do you need your seed region to be a mask (in what space)?
doug
On 8/12/10 8:55 AM, Lena Palaniyappan wrote:
Hi all I want to use a freesurfer parcellation as a seed point in DTI analysis using a non-FSL DTI tractography tool. I have the raw DTI images for around 40 subjects (20 scz 20 controls). From the structural MPRAGEs that correspond to these subjects, I have an average image where I have my defined ROI (which is a freesurfer atlas based parcellation). The ROI has numerous vertices whose MNI coordinates are available to me. Please correct me if I have understood this properly
- I have to process the raw DTI images to obtain FA/trace images first for each subject
- each FA/trace image should be registered to the average structural MPRAGE of the group
How do I then go on to obtain the coordinates for my label on the DTI space?
Many thanks Lena
*Lena Palaniyappan *Clinical Lecturer & Honorary StR | Division of Psychiatry ( University of Nottingham) South Block 'A' floor| Queens Medical Centre | Nottingham | NG7 2UH
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