I.3.3 Directory Information in DICOMDIR

Conformant Application Entities shall include in the DICOMDIR File 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: DICOMDIRs with no directory information are not allowed by this Application Profile.

All implementations shall include the DICOM Media Storage Directory in the DICOMDIR file. There shall only be one DICOMDIR file per File Set. The DICOMDIR file shall be in the root directory of the medium. The Patient ID at the patient level shall be unique for each patient directory record in one File Set.

I.3.3.1 Additional Keys

File Set Creators and Updaters are required to generate the mandatory elements specified in PS 3.3.

Table I.3-2 specifies the additional associated keys. At each directory record level other additional data elements can be added, but it is not required that File Set Readers be able to use them as keys. Refer to the Basic Directory IOD in PS 3.3.

Table I.3-2STD-DVD-MPEG2-MPML and STD-DVD-SEC-MPEG2-MPML Additional DICOMDIR Keys

Key Attribute Tag Directory Record Type Type Notes
Patient’s Birth Date (0010,0030) PATIENT 1C Required if present in any objects referenced by subordinate records with a non-zero length value.
Patient’s Sex (0010,0040) PATIENT 1C Required if present in any objects referenced by subordinate records with a non-zero length value.
Institution Name (0008,0080) SERIES 1C Required if present in any objects referenced by subordinate records with a non-zero length value.
Institution Address (0008,0081) SERIES 1C Required if present in any objects referenced by subordinate records with a non-zero length value.
Performing Physicians’ Name (0008,1050) SERIES 1C Required if present in any objects referenced by subordinate records with a non-zero length value.
Image Type (0008,0008) IMAGE 1C Required if present in image object.
Lossy Image Compression Ratio (0028,2112) IMAGE 1C Required if present in image object with a non-zero length value.
Rows (0028,0010) IMAGE 1
Columns (0028,0011) IMAGE 1

Note: The requirements with respect to the mandatory DICOMDIR keys in PS 3.3 imply that either these attributes are present in the Image IOD, or they are in some other way supplied by the File-set Creator. These attributes are (0010,0020) Patient ID, (0008,0020) Study Date, (0008,0030) Study Time, (0020,0010) Study ID, (0020,0011) Series Number, and (0020,0013) Instance Number.