[Freesurfer] mri_convert mosaic data

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Dear Freesurfer, I have ASL DICOM data from a Siemens scanner in mosaic format. For each subject, there are 64 DICOM files, which consist of both tags and controls. I would like to convert each individual DICOM into a separate NIfTI file or a single 4D NIfTI file ,composed of all 64 dicoms, using the mri_convert. However, when I use the command mri_convert input_dicom output_nifti, the output does not seem right, as it only displays one slice in the sagittal and coronal views. Could you please provide guidance on how to properly convert these DICOM files using mri_convert?

Thanks very much John