help > Suffix `_T1w` not recognized
Apr 20, 2026  03:04 PM | Paul Wright - University College London
Suffix `_T1w` not recognized

I'm using BIDS naming, but the suffix "_T1w" was not recognized by mri_reface, so I had to specify "-imType" to run it. Error text:


<pre>
Unable to determine image type from filename for sub-paul_run-5_acq-MPRAGE_T1w. Use an input filename that contains one of: _T1, _T2, _T1w, _T2w,
_T2star, _T2starw, _FLAIR, _PD, _PDW, _FDG, _PIB, _AV45, _FBP, _FMT, _FBB, _TAU, _AV1451, _CT, or specify with -imType\n
</pre>


I note the help text lists different allowed strings:


<pre>-imType &lt;T1|T2|PD|T2ST|FLAIR|FDG|PIB|FBP|TAU|CT|AUTO&gt;</pre>


Please add BIDS suffixes to the code in the next update, and make the help text and error text match. These include:



  • T1w

  • T2w

  • T2star

  • T2starw

  • PDw


The suffixes below are listed in the error message, but not in the help text, neither in the BIDS glossary. I don't have an opinion about recognizing these, but please remove them from the error message if you decide not to recognize them.



  • AV45

  • FMT

  • FBB

  • AV1451