Hi Koushik,
What version are you using? Not sure when we added this, maybe in 5.2.
So you would need 5.3 for it.
If you use 5.3 already, can you send me the exact command and output.
Thanks, Martin
On 03/19/2014 11:50 AM, Govindarajan, Koushik Athreya wrote:
Hi Martin,
I tried this method of --addtp to add a new time point but
recon-all failed with the message saying my new timepoint was not in
the 'base-tps' file of the base template. Should I be doing something
else before I run this step?
Thanks
Koushik
*From:*Martin Reuter [mailto:mreu...@nmr.mgh.harvard.edu]
*Sent:* Friday, March 14, 2014 9:31 AM
*To:* Govindarajan, Koushik Athreya; freesurfer@nmr.mgh.harvard.edu
*Subject:* Re: [Freesurfer] adding time points to longitudinal base
template
Hi Koushik,
there is a way to add time points without recreating the base:
recon-all -long <tpNsubjid> <longbasesubjid> -addtp -all
This is what the recon-all help says about that:
"If a new timepoint needs to be added to a longitudinal run where a
base subject
has already been created (from prior timepoints), then the -addtp command
can be added to the -long command in order to 'fix-up' the longitudinal
stream to accept the new timepoint. Note that the base subject is *not*
recomputed using the new timepoint. This potentially introduces a
bias, and it
is recommended to NOT add a time point this way! Instead recreate the base
from all time points and run all longitudinals again."
So it's up to you. But given you already have 5 time points in your
base and add only 1, you may be fine. The base should be pretty stable
with 5 and if the 6th is not too different, it should not matter much.
I don't think anyone has ever done a thorough analysis about adding
time points.
Best, Martin
On 03/11/2014 10:08 AM, Govindarajan, Koushik Athreya wrote:
Dear FS experts,
I have a serial study in which I have run
cross-sectional and longitudinal analysis on 5 time points. Now, I
want to add a 6^th time point to my dataset. Do I have to rerun my
base template creation step from scratch or is there a way to just
add further time points to an existing template?
Thanks
Koushik
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