Value Representation
UN Unknown
- Category
- binary-stream
- Max Length
- any
- Fixed Length
- No
- Source
- PS3.5 §6.2
Definition
A string of bytes where the encoding of the contents is unknown (see section 6.2.2).
Attributes using UN
1 DICOM attribute declares this VR.
Working with UN in integration code
VR-aware transformations are where most DICOM integration bugs hide — truncating a PN's 5-component structure, misaligning OB padding, or dropping leading zeros on IS. Saga IT builds production DICOM pipelines that respect VR semantics across Mirth Connect transformers, DIMSE gateways, and cloud DICOM services.