Dear Victoria,
you should be able to assess signal variations in specific regions with ArtRepair. If some of your scans have a signal drop in your region of interest and others don't, ArtRepair will display this when you view your data in a contrast movie. If there is signal drop in all scans, then ArtRepair can't detect it.
Also, although ArtRepair does offer "repair" options, it can't restore information that has never been recorded. Therefore, if there is signal drop in more than a few of your scans, you shouldn't even think of "repairing" your data.
Best,
Volkmar
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