There are 2 steps that can be done in MRICro. It’s a free download from https://www.nitrc.org/projects/mricrogl
In MRICro, go to import- > convert DICOM to NIfTI. Drag the whole DICOM folder of PET files into the dcm2nii window


Into the white box below, drag and drop the dicom files
A message will pop up that the files have been converted
You can find the new .nii.gz files now in the original DICOM folder

Into the white box below, drag and drop the dicom files
| See video below for video steps |