Hi Donatas – All sounds fine. You can process single time points, and you can
process subsets of time points if the DWI data from one of them is unusable.
The T1 base template is only used as a reference space for longitudinal
TRACULA, so it shouldn’t make a huge difference if one additional time point
was used to generate that T1 base template (assuming of course that there
wasn’t a huge morphological difference in that specific time point that would
make the base template much different if it had been generated without that
on behalf of Donatas Sederevicius
Reply-To: Freesurfer support list
Date: Wednesday, January 31, 2018 at 4:51 AM
Subject: [Freesurfer] Longitudinal TRACULA study
I want to clarify some aspects longitudinal TRACULA processing before
processing my data.
For example, I have 3 timepoints of data of the same participant:
All of these have structural and diffusion data (same scanner, same acquisition
parameters). I processed structural data using FS longitudinal pipeline and got
Now I want to run longitudinal TRACULA processing. If all data is OK after
quality checking (struct and DWI) I could set the configuration file as follows:
set subjlist = ( sub101_01 \
set baselist = ( base_101 \
It turns out that DWI data of sub101_01 is extremely distorted and cannot be
used for processing. Should I re-process struct data based on the last two
timepoints or is it perfectly fine to use the base and long derived from all
timepoints although I’m running tracula for the last two timepoints of DWI?
In addition to that, is it fine to run longitudinal TRACULA on a list of
subjects where some of them have only one timepoint of data and structural
processing underwent longitudinal pipeline for that one timepoint?
Thank you for your answers.
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