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Hello Experts,
I do have couple questions about using mri_glmfit and mri_glmfit-sim for this analysis based on the tutorial page. https://surfer.nmr.mgh.harvard.edu/fswiki/PetSurfer 1) Do i have to add any other flags when using mri_glmfit for this analysis? mri_glmfit --y ${results_dir}/all.mgx.subctxgm.mni305.sm05.nii.gz --fsgd $pet_fsgd --C $matrix1 \ --mask ${SUBJECTS_DIR}/fsaverage/mri.2mm/subcort.mask.mgz --glmdir ${results_dir}/sub.pet.B6.glmdir 2) When correcting for multiple comparisons, should i use --2spaces or --3spaces? 3) I ran a paired ttest analysis using age as regressor of no interest for amyloid uptake. My contrast is "1 0" based on the tutorial https://surfer.nmr.mgh.harvard.edu/fswiki/PairedAnalysis. How do i interpret the direction of contrast if I get a result from mri_glmfit-sim (see below)? This is because it doesn't have the Max column for surface based analysis # Cluster Size(n) Size(mm^3) MNIX MNIY MNIZ Max CWP CWPLow CWPHi 1 12709 101672.0 26.00 -69.00 -41.00 5.46844 0.01037 0.00798 0.01316 Right-Cerebellum-White-Matter
Thank you. best, Paul