¥Note: A ROI is defined by the values stored in voxels of the
ÔmaskÕ dataset
HContiguity of voxels
has no meaning to the ROI software described below
HTwo voxels are in
the same ROI if they have the same value in the mask dataset (i.e., it doesnÕt matter where they are located
in the volume)
H
¥3dmaskave
HProgram to compute
the average of voxels from a functional dataset, with voxels selected from a mask dataset (interactive
version: ROI
Average plugin)
HExample:
í 3dmaskave -mask ROI_fred+tlrc -mrange 1 4
í `func_fred+tlrc[2,5,7]`
H
H Will print out (in the shell) one
line of data for each of the 3 selected sub-bricks from the input dataset func_fred+tlrc:
H
í 44.287 [137 voxels] Âsub-brick
#2 values averaged across all 4 ROIs
í 27.021 [137 voxels] Âsub-brick
#5 values averaged across all 4 ROIs
í -33.22 [137 voxels] Âsub-brick #7 values
averaged across all 4 ROIs
å
åThe output above represents the average of all the voxels
collapsed across ROIÕs 1, 2, 3, 4, (specified by -mrange
1 4) in our mask dataset ROI_fred+tlrc
for sub-bricks #2, #5, and #7 from dataset func_fred+tlrc