Hi Jenna,

In a task analysis, having an incorrect TR (esp by a factor of 2) would be severely destructive, as it would throw off all of the stimulus event times.

But in a resting state analysis, particularly a single-echo one using ROI regressors and no band passing and no retroicor, messing up the TR would not seem too terrible. Perhaps the biggest problem would be using a -polort that is much too high or low if the run duration is twice or half as long as it should be. For a fixed -polort, the entire regression matrix might be TR-independent. It depends on the exact command used.

But in any case, it is best to make sure. As Daniel said, it is hard to know what is correct. Usually, the DICOM files would be considered more reliable. But it begs the question of why they differ from the dataset. DICOM files are often anonymized these days, making them less reliable. And people constructing data packages make mistakes.

Is there any independent source of information on this?

Exactly what are the TRs in question here? And where does the data come from?

- rick