H.3.3 Directory Information in DICOMDIR
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### H.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.

#### H.3.3.1 Additional Keys

File Set Creators and Updaters are required to generate the mandatory elements specified in PS3.3.

Table H.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 PS3.3.

Table H.3-2. STD-GEN-DVD and STD-GEN-SEC-DVD 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.
Calibration Image | (0050,0004) | IMAGE | 1C | Required if present in image object with a non-zero length value.
Referenced Image Sequence | (0008,1140) | IMAGE or SPECTROSCOPY | 1C | Required if present in image object with one or more items, either in the top level data set or nested within a functional group sequence of the Shared Functional Groups Sequence (5200,9229). This sequence shall be the entire contents of the sequence present in image object (all items and elements shall be copied in the same order and no addition or removal shall be done). When more then one sequence is present in the image object, the top level data set sequence shall be copied.
Lossy Image Compression Ratio | (0028,2112) | IMAGE | 1C | Required if present in image object with a non-zero length value.
Rows | (0028,0010) | IMAGE or SPECTROSCOPY | 1 |
Columns | (0028,0011) | IMAGE or SPECTROSCOPY | 1 |
Frame of Reference UID | (0020,0052) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object.
Synchronization Frame of Reference UID | (0020,0200) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object.
Number of Frames | (0028,0008) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object.
Acquisition Time Synchronized | (0018,1800) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object.
Acquisition DateTime | (0008,002A) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object.
Image Position (Patient) | (0020,0032) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object, either in the top level data set or nested within a functional group sequence of the Shared Functional Groups Sequence (5200,9229).
Image Orientation (Patient) | (0020,0037) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object, either in the top level data set or nested within a functional group sequence of the Shared Functional Groups Sequence (5200,9229).
Pixel Spacing | (0028,0030) | IMAGE or SPECTROSCOPY | 1C | Required if present in image or spectroscopy object, either in the top level data set or nested within a functional group sequence of the Shared Functional Groups Sequence (5200,9229).

### Note

The requirements with respect to the mandatory DICOMDIR keys in PS3.3 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.

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