G.3.3 Directory Information in DICOMDIR
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### G.3.3 Directory Information in DICOMDIR

If the DICOMDIR is included, conformant Application Entities shall include in it the Basic Directory IOD containing Directory Records at the Patient and the subsidiary Study and Series levels, appropriate to the SOP Classes in the File Set.

All DICOM files in the File Set incorporating SOP Instances defined for the specific Application Profile shall be referenced by Directory Records.

### Note

1. DICOMDIRs with no directory information are not allowed by this Application Profile.

2. In the DICOMDIR each object may be referenced by a referenced file ID (e.g., 000/000) that contains multiple values corresponding to a path for physical system, since the MIME organization is flat. There is no requirement that this path will be used by the receiving application to create file hierarchy.

There may only be one DICOMDIR file per File Set. The Patient ID at the patient level shall be unique for each patient directory record in one File Set.

#### G.3.3.1 Additional Keys

No additional keys are specified.

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