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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

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