Dear experts,
I'm trying to use only some subset of whole volumes and wonder how to reference the zero time of my 4D volumes (scans).
What's the time (in sec) of the first volume (scan)? Is it 0sec? I'm using SPM8 and have 33 scans, collected with interleaved acquisition, TR=2. Every TR, we get pulse signals. For SPM analysis, I set my "zero" time as the onset of the first pulse signal. So I thought the acquisition time of the first scan would be zero, but wonder if there is any lag or delay in saving files that I have to care... Thanks in advance!
Thanks,
CS
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