External Email - Use Caution
Thank you Doug, I will follow your suggestion.
From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of Douglas N. Greve Sent: Wednesday, September 21, 2022 9:58 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [EXTERNAL] Re: [Freesurfer] Longitudinal PET analysis
External Email. Do not click links or open attachments unless you trust the sender and content. Report suspicious emails using Report Phishing button or forward email to phish@northwell.edumailto:phish@northwell.edu 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!
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