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Hello,

I've been using a software to process SWI data that includes an option to save the output as nifti files. When I attempt to use either the mri_info or mri_convert commands on these nifti files I receive the following error message:

niiRead(): unknown space units 7 in /pfc/common_area/high_pass_1750_1910.nii

Where "high_pass_1750_1910.nii" is the name of my nifti file. This leads me to believe there is a problem in how my SWI processing software saves nifti files which makes them incompatible with FreeSurfer. I am curious if it is a problem with some aspect of the nifti header information that is causing me to receive this error and if so, which aspect?

Using the fsl program fslhd I have gotten the header info for one of these nifti files and pasted it below:

filename       high_pass_1750_1910.nii

sizeof_hdr     348
data_type      INT16
dim0           4
dim1           232
dim2           256
dim3           176
dim4           1
dim5           0
dim6           0
dim7           0
vox_units      Unknown
time_units     rad/s
datatype       4
nbyper         2
bitpix         16
pixdim0        0.000000
pixdim1        1.000000
pixdim2        1.000000
pixdim3        1.000000
pixdim4        0.000000
pixdim5        -nan
pixdim6        6445431373862396660923732403945472.000000
pixdim7        6445014188069157487771091399081984.000000
vox_offset     352
cal_max        3253932511416847943508928692748288.0000
cal_min        0.0000
scl_slope      0.000000
scl_inter      6444907725225778945067450074398720.000000
phase_dim      0
freq_dim       0
slice_dim      0
slice_name     Unknown
slice_code     -99
slice_start    30622
slice_end      -1814
slice_duration 0.000000
time_offset    0.000000
intent         Unknown
intent_code    73
´õtent_name    ëh`0
intent_p1      0.000000
intent_p2      6444907725225778945067450074398720.000000
intent_p3      68507965883187986432.000000
qform_name     Unknown
qform_code     0
qto_xyz:1      1.000000  0.000000  0.000000  0.000000
qto_xyz:2      0.000000  1.000000  0.000000  0.000000
qto_xyz:3      0.000000  0.000000  1.000000  0.000000
qto_xyz:4      0.000000  0.000000  0.000000  1.000000
qform_xorient  Left-to-Right
qform_yorient  Posterior-to-Anterior
qform_zorient  Inferior-to-Superior
sform_name     Unknown
sform_code     0
sto_xyz:1      0.000000  0.000000  0.000000  0.000000
sto_xyz:2      0.000000  0.000000  0.000000  0.000000
sto_xyz:3      0.000000  0.000000  0.000000  0.000000
sto_xyz:4      0.000000  0.000000  0.000000  0.000000
sform_xorient  Unknown
sform_yorient  Unknown
sform_zorient  Unknown
file_type      NIFTI-1+
file_code      1
descrip        
aux_file       ¤ô

I am hoping someone can help me understand why I am receiving this error from mri_info.

Thank you,
John