File Set Creators and Updaters are required to generate the mandatory elements specified in PS 3.3.
Table D.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 D.3-2STD-GEN Additional DICOMDIR Keys
|Key Attribute||Tag||Directory Record Type||Type||Notes|
|Image Type||(0008,0008)||IMAGE||1C||Required if present in image object.|
|Referenced Image Sequence||(0008,1140)||IMAGE||1C||Required if present in image object.|
|>Referenced SOP Class UID||(0008,1150)||IMAGE||1C||Required if Referenced Image Sequence (0008,1140) is present|
|>Referenced SOP Instance UID||(0008,1155)||IMAGE||1C||Required if Referenced Image Sequence (0008,1140) is present.|
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.