ROI relationships: When segmenting cell contents, shown as cytoplasm, actin filaments, nucleus and nucleolus, these fall into a strict hierarchy (a nucleus can only be in one cell, though one cell could have more than one nucleus). If we added a ROI type that was a container of ROIs (note: not a union), and added a means of classifying ROIs with tags/labels, this would be very useful for HCS and other types of analysis. Additionally, some relationships are not hierarchical, e.g. tree-like branching and merging in a vessel bed, but could be represented if a ROI could point to one or more other ROIs, which would permit a directed graph of relationships between ROIs.
Tracking Containment User modification (branch/merge) Inherit properties Layer DAG