Hi Tzvetan, Which anatomical MR are you using? Note that the ‘baked in’ fiducial locations are indeed approximate, but they only make sense in context of the anatomical image in which they have been clicked. This image was a 1mm resolution image with a sufficient field of view to capture the entire scalp surface + facial details. This image is not part of the released data. Thus, in short, the fiducial locations (defined in voxels) don’t make sense in the context of the anatomical image you are using. Since everything is already in register (and the co-registration details are represented in the 100307_MEG_anatomy_transform.txt), what is it you want to do?
Best wishes, Jan-Mathijs Jan-Mathijs Schoffelen, MD PhD Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands Donders Institute for Brain, Cognition and Behaviour, Centre for Cognitive Neuroimaging, Radboud University Nijmegen, The Netherlands j.schoffe...@donders.ru.nl Telephone: +31-24-3614793 http://www.hettaligebrein.nl On Apr 27, 2015, at 8:08 AM, Tzvetan Popov <tzvetan.po...@gmail.com> wrote: > Dear hcp-users, > > I am trying to coregister the individual MRI and the 4D coordinates using the > fiducial information provided in ‘100307_MEG_anatomy_fiducials.txt’. When > using the provided voxel coordinates the anatomical image is misaligned (see > attached figure 2). Interactively providing the approximate coordinates of > the fiducials aligned the volume correctly (attached figure 1). It appears to > me that the provided voxel coordinates are somewhat off. . Am I doing > something wrong, has anybody encountered similar problem? > Thanks a bunch in advance > tzvetan > > Here is the code snippet that will produce the two figures > > cfg=[]; > cfg.method = 'fiducial'; > cfg.fiducial.nas = [ 40 154 94 ];% hcp locations > cfg.fiducial.lpa = [ 139 168 169 ];% hcp locations > cfg.fiducial.rpa = [ 141 171 26 ];% hcp locations > mriR = ft_volumerealign(cfg, mri); > ft_determine_coordsys(mriR, 'interactive', 'no’); > > cfg=[]; > cfg.method = 'fiducial'; > cfg.fiducial.nas = [128 299 141 ];% my interactive locations > cfg.fiducial.lpa = [ 240 148 91 ];% my interactive locations > cfg.fiducial.rpa = [ 29 157 80];% my interactive locations > mriR = ft_volumerealign(cfg, mri); > ft_determine_coordsys(mriR, 'interactive', 'no'); > > > <Misaligned.png><Aligned correctly.png> > _______________________________________________ > HCP-Users mailing list > HCP-Users@humanconnectome.org > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
