I came across the following warning while working with some (but not all) GE
T1 and T2 data:
"inconsistent left-right order stored in sform and qform in file "...
"Using sform instead of qform values"
The dicom data were run through dcm2nii before opening in FSLview.
Subjects with the warning do demonstrate a discrepancy between qform and
sform matrices.
Should I be concerned about this warning?
If I remember correctly, GE scanners used to be susceptible to L-R
orientation being dependent on what the scanner operator did at the time of
acquisition. Is this still true?
Any comments are greatly appreciated.
Jenifer
The fslhd info (tail of the file) for subjects with this warning is appended
below:
qform_name Scanner Anat
qform_code 1
qto_xyz:1 0.937500 0.000000 -0.000000 -116.604500
qto_xyz:2 0.000000 1.500000 -0.000000 -73.582993
qto_xyz:3 0.000000 0.000000 -0.937500 -113.845497
qto_xyz:4 0.000000 0.000000 0.000000 1.000000
qform_xorient Left-to-Right
qform_yorient Posterior-to-Anterior
qform_zorient Superior-to-Inferior
sform_name Scanner Anat
sform_code 1
sto_xyz:1 0.937500 0.000000 0.000000 -116.604500
sto_xyz:2 0.000000 1.500000 0.000000 -73.582993
sto_xyz:3 0.000000 0.000000 0.937500 -113.845497
sto_xyz:4 0.000000 0.000000 0.000000 1.000000
sform_xorient Left-to-Right
sform_yorient Posterior-to-Anterior
sform_zorient Inferior-to-Superior
file_type NIFTI-1+
file_code 1
descrip
aux_file
