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Dear Bruce Fischl,
Hi, I'm Yoonho. In the previous post, "Re:[Freesurfer] Inquiry about process time by use "recon-all" (Fri, 12 Jan 2018 12:29:19-0800)", I found that the process time for recon-all depend on both how abnormal the anatomy is and how high the CNR of your scan is.
1. *Does "how abnormal the anatomy" mean that there is an anatomical abnormality due to a disease based on MR image and "how high the CNR of your scan is" mean that there is a CNR, [x_mean (gray matter) - y_mean (white matter)] / standard deviation_air (background)?* 2. *Related to process time for recon-all based on the FS ver.7.2.0, is open-mp effect stronger than acquisition parameter optimization effect? Which one is more helpful in reducing the process time?*
In the longitudinal analysis for freesurfer,
1. *Is it possible to use longitudinal analysis of MR images obtained from equipment with different magnetic field strengths (1.5T vs 3T) in time series for the same subjects?*
Looking forward to your feedback. Thank you very much.
Sincerely, Yoonho