Hi, List experts,
I was wondering whether we can directly get the information from the imaging files on how the fMRI data (i.e.,slices) were acquired. For instance, there are at least four types as following. These days I read papers and realize this question which is always in my mind.
Sequential Ascending: 1,2,3,4,5,6
Sequential Descending: 6,5,4,3,2,1
Interleaved Ascending: 1,4,2,5,3,6
Interleaved Descending: 6,3,5,2,4,1
Further, I am noted that an option “tpattern” is corresponding to this, but I do not know exactly how the relates. Any good pointers?
tpattern = Code word that identifies how the slices (z-direction) were gathered in time. The values that can be used: alt+z = altplus = alternating in the plus direction alt+z2 = alternating, starting at slice #1 alt-z = altminus = alternating in the minus direction alt-z2 = alternating, starting at slice #nz-2 seq+z = seqplus = sequential in the plus direction seq-z = seqminus = sequential in the minus direction zero = simult = simultaneous acquisition FROM_IMAGE = (try to) read offsets from input images @filename = read temporal offsets from 'filename'
Any advice would be much apprecriated.