See my comments here:

  https://neurostars.org/t/slicetiming-val...

This data was acquired with an early multiband (SMS) research sequence from the MGH. The sequence stored the single-band rather than multi-band slice times in the DICOM CSA header. My software assumes that the DICOM data is useful. I note you are using a version of my software from 2022 (v1.0.20220720). You should try the latest release to see if it can find any DICOM headers with valid timing. If this does not work, you will need to contact the developers of the sequence to find out their SMS slice timing pattern.