DICOM PS3.3 2021b - Information Object Definitions

A.34.15.4.5 Channel Source and Channel Source Modifiers (Current)
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##### A.34.15.4.5 Channel Source and Channel Source Modifiers

Channel Source Sequence (003A,0208) in each Channel Definition Sequence Item DCID 3030 “EEG Leads”.

The Channel Source Modifiers Sequence (003A,0209) in each Channel Definition Sequence (003A,0200) 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.

EEG recordings not using a common reference electrode shall contain the location of the reference electrode for the given channel in the Channel Source Modifiers Sequence (003A,0209) as follows:

- First Item: "Differential signal" (DCID 3240 “Electrophysiology Measurement Functions and Techniques”)

- Second Item: Location of the reference lead (DCID 3030 “EEG Leads”)

EEG recordings using a common reference electrode shall be coded in the same way, but contain the same reference lead in every Channel Source Modifier.

### Note

CID 3030 “EEG Leads” is extensible. Terms from other Context Groups or elsewhere may be used in the Channel Source Sequence as well as in the Channel Source Modifier Sequence to identify channels not contained in CID 3030 “EEG Leads”. Such Terms are expected to be described in the Conformance Statement.

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A.34.15.4.4 Sampling Frequency | Home | A.34.15.4.6 Waveform Sample Interpretation

DICOM PS3.3 2021b - Information Object Definitions