Note that FS will "conform" the volume to be coronal with axes aligned with the major scanner axes, so that will undo a lot/all of your rotation
On 12/29/2020 11:37 AM, Fischl, Bruce wrote: > p.s. oh, and the .lta format is ascii so you can just look at it to see if it > is vox2vox or ras2ras > > -----Original Message----- > From: freesurfer-boun...@nmr.mgh.harvard.edu > <freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Tisdall, Dylan > Sent: Thursday, December 24, 2020 11:41 AM > To: freesurfer@nmr.mgh.harvard.edu > Subject: [Freesurfer] talairach.lta coordinate spaces > > External Email - Use Caution > > Hi list, > > I'm trying to understand whether the talairach.lta transform is from the > image-axes RAS to talairach or the scanner-axes RAS to talairach. Basically, > if I rotate the imaging FOV and scan the same subject, should I expect that > to change talairach.lta or not? My confusion stems from the discrepancy > between what the scanner terms RAS coordinates (aligned to the gradient axes) > vs. what might be plausibly called RAS in the image coordinates (aligned to > the FOV axes). > > The underlying goal here is to try to evaluate how gradient-axis-aligned > someone's head was when they were loaded in the scanner. > > > Thanks, > Dylan > > --- > Dylan Tisdall, PhD > Research Assistant Professor > Department of Radiology > Perelman School of Medicine > University of Pennsylvania > > Room D406 Richards Medical Labs > 3700 Hamilton Walk > Philadelphia, PA 19104 > > > > _______________________________________________ > 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 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
