DICOM PS3.3 2019c - Information Object Definitions
A.34.4.4.5 Channel Source

The Defined CID for the Channel Source Sequence (003A,0208) in each Channel Definition Sequence (003A,0200) Item shall be CID 3001 “ECG Leads”.

Note

Terms from other Context Groups may also be used for extended specification of the Channel Source, as declared in the Conformance Statement for an application (see PS3.2).

DICOM PS3.3 2019c - Information Object Definitions