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One word of advice: Try converting using dcm2ii which is part of "mricron" (the replacement for mricro). http://www.sph.sc.edu/comd/rorden/mricron/dcm2nii.html It automatically creates a 4D NIFTI file. Also has other useful features such as recursive action, anonimization, and others. Even calculates an expected number of files (based on number of slices and acquisition). and reports when the number of files does not match the prediction. Besides being a possible improvement to your process it can give you a second source for a the same data in 4D NIFTI format, which you can check with Feat and Melodic. On Mon, Jun 2, 2008 at 1:56 PM, Tony Goldstone < [log in to unmask]> wrote: > I am having problems opening 4D nii.gz epi files with Feat and Melodic. > > The images were collected on a Seimens scanner in NEMA format. > > They have been converted to 3D hdr/img volume files using MRIcro, then > converted to individual 3D volume nii.gz files using fslchfiletype and then > merged into a single 4D nii.gz file using fslmerge. > > I can open and view the file using Fslview, but neither Melodic or Feat > will recognize the file (not able to determine number of volumes within or > run from gui). > > The header info is as follows: > > sizeof_hdr 348 > data_type INT16 > dim0 4 > dim1 128 > dim2 128 > dim3 19 > dim4 35 > dim5 1 > dim6 1 > dim7 1 > vox_units mm > time_units s > datatype 4 > nbyper 2 > bitpix 16 > pixdim0 0.0000000000 > pixdim1 1.8799999952 > pixdim2 1.8799999952 > pixdim3 6.0000000000 > pixdim4 1.0000000000 > pixdim5 0.0000000000 > pixdim6 0.0000000000 > pixdim7 0.0000000000 > vox_offset 352 > cal_max 2851.0000 > cal_min 0.0000 > scl_slope 1.000000 > scl_inter 0.000000 > phase_dim 0 > freq_dim 0 > slice_dim 0 > slice_name Unknown > slice_code 0 > slice_start 0 > slice_end 0 > slice_duration 0.000000 > time_offset 0.000000 > intent Unknown > intent_code 0 > intent_name > intent_p1 0.000000 > intent_p2 0.000000 > intent_p3 0.000000 > qform_name Unknown > qform_code 0 > qto_xyz:1 1.880000 0.000000 0.000000 0.000000 > qto_xyz:2 0.000000 1.880000 0.000000 0.000000 > qto_xyz:3 0.000000 0.000000 6.000000 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 FSL4.0 > aux_file > > > Does anyone know what the problem might be? > Thanks > Tony >