T2* coregistration only with multi-echo data?

1

Hello all,

I tried implementing the T2* driven coregistration using the --t2s-coreg flag (fMRIPrep version 1.5.8). It finishes with no errors, but looking through the output file, I noticed this line: “No multiecho BOLD images found for T2* coregistration. Using standard EPI-T1 coregistration.”

In order for T2* coregistration to work, does the BOLD data have to be multiecho? And would fMRIPrep detect multiecho data automatically?

Thanks,
Claire

2

Hi @cpauley,

Yes, to use the T2* coregistration, the BOLD data must be multi-echo. fMRIPrep would automatically detect the multi-echo data, assuming it’s in BIDS format.

3

Hi @mgxd

Any idea what’s the --t2s-coreg equivalent for fMRIPrepv20.2.1? Or does fMRIPrep now automatically detect a multi-echo dataset and output an optimally combined image?

Cheers,
Thapa

4

There is no equivalent anymore. We dropped the --t2s-coreg approach from fMRIPrep because many folks were finding that coregistration was not improved when using the T2* map. However, that doesn’t impact anything other than the coregistration.

Exactly! Unless you feed in individual echoes with --echo-idx, it will combine echoes automatically.

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5

Awesome! Thanks for clearing that for me @tsalo :grinning: