afni.nimh.nih.gov

Hello AFNI

I ran 3dttest++ to compare the CBF values of 2 groups. I used the -mask flag which is supposed that restrict my analysis to the mask I am using (just gray matter excluding cerebellum) and I am having results that are showing me some white matter voxels, what am I doing wrong? Here is my 3dttest code

3dttest++ -mask GMmask__MNI152_2009_noCerebellum_final.nii \
-prefix GriefvsHC_AFNI_Mask_CovariateswGM_DIFF_noCerebellum \
-prefix_clustsim GriefvsHC_AFNI_Mask_CovariateswGM_DIFF_noCerebellum \
-tempdir /scratch/global/lbohorquez/Brianna/results/Luisa/temp \
-covariates Covariates_wGM.txt"[0,1,2,3]" \
-center DIFF\
-Clustsim 24 \
-toz \
-setA Grief \
172 ASL_CBF_2MNI_6mm_172_120916.nii \
....more subjects....
-setB HC \
198 ASL_CBF_2MNI_6mm_198_061814.nii \
....more subjects....