There are 4 hierarchical levels in DICOM: PATIENT, STUDY, SERIES and IMAGE. Each PATIENT can have one or more Studies. Each STUDY can have one or more Series. Each SERIES can have one or more IMAGES.
Patient Root Hierarchy Study Root Hierarchy
Hierarchical SOP Instance
While DicomObjects can not create a Dicom Hierarchical SOP Instance dataset collection directly, however it can do much of the work for you. A Hierarchical SOP Instance Dataset collection are similar in structure to a DicomDir which DicomObjects can create automatically. Hierarchical SOP Instances are primarily used in the creation of Key Note Objects. The Structure of the Hierarchical SOP Instance is Study - Series - Instance (NO PATIENT)