Take the inverse
On 04/12/2012 01:47 PM, Johnson wrote:
I do the transformation in Matlab, I found out that the matlab *load_mgh* function returns the vox2ras matrix, where can I find the ras2vox matrix?
On 04/12/2012 12:11 PM, Bruce Fischl wrote:
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, Johnsonjgadel2@uic.edu mailto: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 >>>>>>>> >>>>>>>> >>>>>>> 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 mailto:Freesurfer@nmr.mgh.harvard.edu >>>>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >>>>> >>> _______________________________________________ >>> Freesurfer mailing list >>> Freesurfer@nmr.mgh.harvard.edu mailto:Freesurfer@nmr.mgh.harvard.edu >>> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >>> >> -- >> 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 mailto:jgadel2@uic.edu >> >> > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu mailto:Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu mailto:Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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