The Defined Context ID for the Channel Source Sequence (003A,0208) in each Channel Definition Sequence Item shall be CID 3003, CID 3001 for surface ECG channels, or CID 3090 for time synchronization channels. The Channel Source Code Value shall encode at minimum the metric (measured physical quality) and function (measurement or stimulus); unless otherwise specifically encoded, the default function shall be “measurement”.
The Channel Source Modifiers Sequence (003A,0209) in each Channel Definition Sequence Item shall be used to specify additional qualifiers of the semantics of the waveform source, including technique and anatomic location, if not encoded by the Channel Source Code Value. Technique, with terms from Defined Context ID 3241, shall be specified in Channel Source Modifiers Sequence Items prior to the cardiac anatomic location(s), with terms from Defined Context ID 3010, 3014, and 3019. If technique is pullback, the sequence of anatomic locations shall be specified in ordered Channel Source Modifiers Sequence Items (e.g., initial, transitional, and final locations).
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).