-20-
HExample:
3dROIstats -mask ROI_fred+tlrc Ôfunc_fred+tlrcÕOutput shown in the shell (use > command to save into to a text file):
FileSub-brickMean_1Mean_2Mean_3
Sub-brickMean_1Mean_2Mean_3func_fred+tlrc033.344.455.5
033.344.455.5func_fred+tlrc122.266.6-21.2
122.266.6-21.2func_fred+tlrc22.39.7777.777
22.39.7777.777åThe Mean_1 column is the average over the ROI whose mask value is
Ò1Ó. The average is calculated
for voxels from our functional dataset func_fred+tlrc, that fall within the ROI. Averages are computed at each sub-brick (#0, #1,
#2, etc)
íMeans
have also been computed for ROIs whose mask value is Ò2Ó (Mean_2) and Ò3Ó (Mean_3)
HVery
useful if you creat ROI masks for a number of subjects, using the same number codes for the same anatomical regions (e.g.,
1=hippocampus, 2=amygdala, 3=superior temporal gyrus, etc.)
HYou
can load the output of 3dROIstats
into a spreadsheet for further analysis (e.g., statistics with other subjectsÕ data)