DICOM PS3.3 2021e - Information Object Definitions
A.34.4.4.5 Channel Source

For Channel Source Sequence (003A,0208) in each Channel Definition Sequence (003A,0200) Item DCID 3001 “ECG Leads” shall be used.

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 2021e - Information Object Definitions