DICOM PS3.17 2022d - Explanatory Information

YYYY.2.3.3 Managed Metadata and Updated Metadata

Many repository applications do not update stored SOP Instances with changes to metadata that occur over time (e.g., patient name and ID). Therefore, applications that use non-DICOM direct file access need to obtain the current metadata, which can be retrieved in a query using the Metadata Sequence (0008,041D) or the Updated Metadata Sequence (0008,041E) Key Attribute, defined by the Repository Query SOP Class (see Section C.6.4.1.4 “Metadata Sequence and Updated Metadata Sequence” in PS3.4). It is the responsibility of the application using direct file access to use the metadata in these returned Attributes, but recognizing that that metadata may also become outdated due to subsequent repository updates (see Section YYYY.7.9).

To support some use cases, especially in research, the SCP may manage a broad set of metadata Attributes of the stored SOP Instances in its database for rapid response to queries. The SCP may return all of these metadata Attributes in the Metadata Sequence (0008,041D) if requested by the SCU. Because there are no limitations on the extent of this metadata, a requesting SCU must be prepared to handle a large data volume, especially for queries at the Instance query level.

DICOM PS3.17 2022d - Explanatory Information