DICOM PS3.3 2019a - Information Object Definitions

F.5.2 Study Directory Record Definition

The Directory Record is based on the specification of Section F.3. It is identified by a Directory Record Type of Value "STUDY." Table F.5-2 lists the set of keys with their associated Types for such a Directory Record Type. The description of these keys may be found in the Modules related to the Study IE of Composite IODs. This Type of Directory Record may reference a Lower-Level Directory Entity that includes one or more Directory Records as defined in Table F.4-1. Only one Study Directory Record per Study Instance UID shall be present in a Basic Directory Instance; this implies that a Study belongs to a single patient and shall be referenced only once for that patient.

Table F.5-2. Study Keys




Attribute Description

Specific Character Set



Required if an extended or replacement character set is used in one of the keys

Study Date



Study Time



Study Description



Study Instance UID



Required only if (0004,1511) is absent (see Note).

Study ID



Accession Number



Any other Attribute of the Study IE Modules



The Study Instance UID shall be present as a mandatory key only if no file is referenced by this Directory Record. In the case where this Directory Record references a file, the Directory Record contains in the Referenced SOP Instance UID in File (0004,1511). In this case (0004,1511) may be used as a "pseudo" Directory Record Key (see Table F.3-3) and need not be duplicated.

DICOM PS3.3 2019a - Information Object Definitions