DICOM PS3.3 2023a - Information Object Definitions

10.29 UDI Macro

Table 10.29-1 specifies the Attributes of the UDI Macro, which records details associated with a Unique Device Identifier (UDI).

Table 10.29-1. UDI Macro Attributes

Attribute Name



Attribute Description

Unique Device Identifier



The entire Human Readable Form of the UDI as defined by the Issuing Agency.

See Section 10.29.1.

Device Description



Further description in free form text describing the device.

This can be used to distinguish between Items when multiple UDIs are recorded in a Sequence.

10.29.1 Unique Device Identifier

The UDI is a combination of the Device Identifier and the Production Identifier.

The format of the string is defined by a corresponding Issuing Agency, such as:

Details for encoding a valid device identifier are managed by the Issuing Agency. For full documentation, refer to issuer materials.

The United States FDA requires the Issuing Agency to use only characters and numbers from the invariant character set of ISO/IEC 646 (ISO 7-bit coded character set also known as ISO IR 6). DICOM puts no constraints on the length of the string or the character sets beyond the UT Value Representation. Implementations should be prepared to handle very large strings and unusual characters.

DICOM PS3.3 2023a - Information Object Definitions