open-discussion > RE: ROI and ghost mask output
Jan 11, 2017  08:01 PM | Syam Gadde
RE: ROI and ghost mask output
I don't see your attached file, but it's OK for the "ghost mask" to overlap with the "real phantom" -- the voxels considered in calculation are only those that are in one mask and not in the other.  That results in "ghost-only" voxels, and "non-ghost-only" voxels.  I guess typically the two ROIs would look like an hourglass on its side and it's shifted counterpart.  So if your ROIs look like that, then you are probably doing the right thing.  You can look at the code in fmriqa_ghostiness.c if want details on how the metrics are calculated (once the original dilated mask is generated).

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Sebastian Hoefle Jan 11, 2017
RE: ROI and ghost mask output
Syam Gadde Jan 11, 2017
Sebastian Hoefle Jan 12, 2017
Syam Gadde Jan 12, 2017