[Freesurfer] mri_convert does not recognize dicom files

Hello, I am unable to use mri_convert to import dicom files. Below are examples of the errors.

For a GE scan: mri_convert -it ge -ot mgz -i 01.v2 -o orig.mgz reading from 01.v2... genesisRead(): can't determine file name format for ./01.v2

For a Siemens scan: mri_convert -it siemens_dicom -ot mgz -i 0001.dcm -o orig.mgz reading from 0001.dcm... ERROR (ScanSiemensSeries): ./0001.dcm is not a Siemens DICOM file ERROR: could not find any files (SeriesList==NULL)

Similar errors are given when the generic dicom is used. Other programs, such as Osirix and Analyze are able to process the DICOM files. Is there an obvious error in the command? What else should I consider?

Thank you ~julia