If you want to register your DWI to T1, you should register to 
mri/brain.mgz. You can do this with bbregister, or with any affine 
registration tool of your choice.

On Mon, 26 Mar 2012, Johnson wrote:

> Hi
> I found it in a 256x256x256 space while the T1 we use is in different space, 
> I found this page on the registration step:
> http://surfer.nmr.mgh.harvard.edu/fswiki/FsAnat-to-NativeAnat
> I wish to know how this script work?
>
> mri_label2vol --seg aseg.mgz --temp rawavg.mgz --o aseg-in-rawavg.mgz 
> --regheader aseg.mgz
>
> what is the transformation used ?
> JG
>
>
> On 03/26/2012 12:24 PM, Anastasia Yendiki wrote:
>>
>>  Hi Johnson - The aparc+aseg.mgz is in the same space as the T1 used as
>>  input to freesurfer.
>>
>>  a.y
>>
>>  On Mon, 26 Mar 2012, Johnson wrote:
>> 
>> >  Hi FS expert
>> >  I need to know the transformation matrix itself since I will do the 
>> >  transformation in matlab.
>> >  I successfully transformed white matter fibers coordinates to T1 using 
>> >  AIR 5.0 from LONI lab.
>> >  They provide a transformation matrix.
>> >  Now I want to transform the coordinates from T1 to Freesurfer space, so
>> >  my question is: what is the transformation matrix that relates the T1
>> >  which FS have used for parcellation and segmentation with the 
>> >  aparc+aseg.mgz file?
>> >  I searched the logs but couldn't find such matrix.
>> >  I don't want to do a registration step since it will be less accurate 
>> >  than the one that was generated during the segmentation process.
>> >  Also is it just one transformation or a combination of transformations?
>> > 
>> >  thanks
>> > 
>> > 
>> 
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