add support for the scanras/nifti and scanlps/dicom coordinate system#1878
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robertoostenveld merged 6 commits intofieldtrip:masterfrom Sep 8, 2021
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add support for the scanras/nifti and scanlps/dicom coordinate system#1878robertoostenveld merged 6 commits intofieldtrip:masterfrom
robertoostenveld merged 6 commits intofieldtrip:masterfrom
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…n reading, be explicit about mm units
for LPS it now also ensures that the nose points to the top in the superior and inferiour views
combined with LPS or with RAS for the axes this now results in well-specified coordinate systems
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- it can be 0=unknown, 1=scanras, 2=aligned, 3=tal, 4=mni - see #444 and fieldtrip/fieldtrip#1878
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- it was added earlier today with fieldtrip#1878, but after some more consideration 'nifti' is not clear enough (as the file can have a qform or sform coordinate system with code=0,1,2,3,4)
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Following investigations in fieldtrip/website#444, these have been determined to have their origin in the MRI scanner origin (at the center of the gradient coil) and the direction of the axes is well defined.
ft_read_mri,ft_convert_coordsys, andft_determine_coordsysnow all know how to work with these. Some private functions have also been updated.