A.34.6.4.7 Channel Source
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##### A.34.6.4.7 Channel Source

The Defined CID for the Channel Source Sequence (003A,0208) in each Channel Definition Sequence Item shall be CID 3003 “Hemodynamic Waveform Sources”, CID 3001 “ECG Leads” for surface ECG channels, or CID 3090 “Time Synchronization Channel Types” 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 CID 3241 “Hemodynamic Measurement Techniques”, shall be specified in Channel Source Modifiers Sequence Items prior to the cardiac anatomic location(s), with terms from Defined CID 3010 “Cardiovascular Anatomic Locations”, CID 3014 “Coronary Artery Segments”, and CID 3019 “Cardiovascular Anatomic Location Modifiers”. 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).

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