yes
On Thu, 12 Apr 2012, Johnson wrote:

The vector coordinates will be in the voxel space

On 04/12/2012 11:54 AM, Bruce Fischl wrote:

Hi Johnson

it depends whether you are using the ras2vox or vox2ras. It should be:

V_rawavg =  M_ras2vox_rawavg * inv(M_ras2vox_aseg) * V_aseg

Where the V_* are 4x1 homogenous vectors.

cheers
Bruce

On Thu, 12 Apr
2012, Johnson wrote:

so to be clear about it, suppose T1 is the matrix in aseg and T2 is the 
one
in rawavg,
to transform from aseg to rawavg I will apply invert(T1)*T2 is that 
correct?


On 4/11/2012 8:12 PM, Bruce Fischl wrote:

Invert one and compose it with the other



On Apr 11, 2012, at 7:48 PM, Johnson<jgadel2@uic.edu>    wrote:

there are two transformation matrices one in aseg and one in rawavg, 
how
do I use them ?

On 04/11/2012 6:12 PM, Bruce Fischl wrote:

yes
On Wed, 11 Apr 2012, Johnson wrote:

great, so if I can read the header from the aseg file and the header
from the
rawavg header file I would be able to transfer any point from the 
aseg
space
to the rawavg space is that correct ?

On 04/11/2012 4:40 PM, Bruce Fischl wrote:

it registers them based on the header information, but since the 
aseg
is
derived from the rawavg that should be exactly correct


On Wed, 11 Apr 2012, Johnson wrote:

And it exactly does that, does it register them together or use a
pre-known
transformation matrix
On 04/11/2012 3:46 PM, Bruce Fischl wrote:

Hi Johnson

I believe it resamples the aseg to have the same geometry as the
original
scan.

cheers
Bruce
On Wed, 11 Apr 2012, Johnson wrote:

Hi
Can someone tell me please in details what does this line do?
mri_label2vol --seg aseg.mgz --temp rawavg.mgz --o
aseg-in-rawavg.mgz
--reg
header aseg.mgz
thanks

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-- 
Johnson J. GadElkarim
Research Assistant, Department Of Psychiatry,
PhD Candidate, Department Of Electrical&      Computer Eng.,
University Of Illinois at Chicago
Mob: 312 - 376 - 7322
Email: jgadel2@uic.edu

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Freesurfer mailing list
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_______________________________________________
Freesurfer mailing list
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-- 
Johnson J. GadElkarim
Research Assistant, Department Of Psychiatry,
PhD Candidate, Department Of Electrical &  Computer Eng.,
University Of Illinois at Chicago
Mob: 312 - 376 - 7322
Email: jgadel2@uic.edu