I understood TR as the time necessary to scan an entire volume, i.e. the acquisition duration for all the slices that make up a volume, regardless of whether anatomical or functional.
But while TR for fMRI is typically in the order of seconds, TR for structural images seems to be in the order of ms. Is it the case that TR then represents not the time between consecutive volumes but between consecutive slices? If so, then is it correct to say the volume acquisition time for structural images is the TR multiplied by the number of slices?
Thank you for any help!