F.5.2 Study Directory Record Definition
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### 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

Key | Tag | Type | Attribute Description
--- | --- | --- | ---
Specific Character Set | (0008,0005) | 1C | Required if an extended or replacement character set is used in one of the keys
Study Date | (0008,0020) | 1 |
Study Time | (0008,0030) | 1 |
Study Description | (0008,1030) | 2 |
Study Instance UID | (0020,000D) | 1C | Required only if (0004,1511) is absent (see Note).
Study ID | (0020,0010) | 1 |
Accession Number | (0008,0050) | 2 |
Any other Attribute of the Study IE Modules | 3 |

### Note

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.

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