[Regions of Interest (ROI) within a subject Act. Primarily used for making secondary observations on a subset of a subject observation. The relationship between a ROI and its referenced Act is specified through an ActRelationship of type "subject" (SUBJ), which must always be present. ( HL7V3.0 )]
UMLS (HL7) C1699564 Relation/PAR: observation
Relation/CHD: overlay ROI
bounded ROI