DICOM PS3.3 2021e - Information Object Definitions

F.5 Definition of Specific Directory Records

The following Sections specify a number of Directory Records that were introduced by the Basic Directory IOD Information Model presented in Section F.4. For each one, it identifies the SOP Classes that may be referenced and the related mandatory keys. Keys are assigned a Type designation that indicates if it is required for all Media Storage Operations of the Directory (see Section 5).

Type 2 and Type 3 Keys may be changed to Type 1 and Type 2 or 3 respectively by Application Profiles defined in PS3.11. Keys based on Private Data Elements, or Private Keys may also be used in addition to Standard defined Keys. However such Private keys may be ignored by any File-set Reader or Updater.


Normalized Print media storage was previously defined in DICOM. It is now retired. See PS3.3-1998.

F.5.1 Patient 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 "PATIENT". Table F.5-1 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 Patient IOD or the Patient IE of Image 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.

Table F.5-1. Patient Keys




Attribute Description

Specific Character Set



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

Patient's Name



Patient ID



Any other Attribute of the Patient IE Modules


For a given File-set, the Patient ID shall be unique. This means that it shall not appear in different Patient Directory Records.

DICOM PS3.3 2021e - Information Object Definitions