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, Johnsonjgadel2@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 >>>>> >>>>> >>>> The information in this e-mail is intended only for the person to >>>> whom it >>>> is >>>> addressed. If you believe this e-mail was sent to you in error and >>>> the >>>> e-mail >>>> contains patient information, please contact the Partners Compliance >>>> HelpLine at >>>> http://www.partners.org/complianceline . If the e-mail was sent to >>>> you in >>>> error >>>> but does not contain patient information, please contact the sender >>>> and >>>> properly >>>> dispose of the e-mail. >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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