You may be able to use one of the paired diff options in mris_preproc.
Run it with --help. I also put some info on it below. QDEC has been
deprecated
--paired-diff
After concatenating all the inputs together, create a new output file by
computing paired differences, ie, Input1-Input2, Input3-Input4, etc.
There must be an even number of inputs. The inputs are "pruned" before
taking the difference, meaning that values for all inputs are set to 0
if any individual is 0.
--paired-diff-norm
Same as --paired-diff, but normalizes by average of time points, ie,
(Input1-Input2)/((Input1+Input2)/2).
--paired-diff-norm1
Same as --paired-diff, but normalizes by time point 1, ie,
(Input1-Input2)/Input1.
--paired-diff-norm2
Same as --paired-diff, but normalizes by time point 2, ie,
(Input1-Input2)/Input2.
On 9/20/2022 3:31 PM, Gomar, Jesus wrote:
External Email - Use Caution
Hello Freesurfer developers,
I am interested in analyzing PET data following a longitudinal design.
I have co-registered each PET image to the closest MRI in time
processed through the longitudinal stream.
I have sampled each co-registered PET image time-point onto fsaverage
surface via the individual's subject surface (mri_vol2surf).
From this point:
1.Is it possible to obtain spc (symmetrized percent change) using
long_mris_slopes for each subject?
2.Is there a way to input the sampled surfaces into a qdec file for
long_mris_slopes command?
1) FreeSurfer version: freesurfer-linux-centos6_x86_64-7.2.0.
2) Platform: Ubuntu 18,04.6 LTS
3) uname -a: Linux ubuntu 5.4.0-122-generic-Ubuntu UTC 2022 x86_64
x86_64 x86_64 GNU/Linux
Thank you!
Jesus
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