Caching Algorithms (Green area I, II, III are viewed areas and stored at the cache. Blue area is the new requested view. Turquoise areas are the overlaps of viewed areas and requested area.) A1 uses the overlaps of I and II, A2 uses only the overlap I and in A3 only the overlaps I and II are used.
Wienert et al. Diagnostic Pathology 2009 4:3 doi:10.1186/1746-1596-4-3