C.18.5 Waveform Reference Macro
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### C.18.5 Waveform Reference Macro

Table C.18.5-1 specifies the Attributes that convey a reference to a DICOM waveform.

Table C.18.5-1. Waveform Reference Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Include Table C.18.3-1 “Composite Object Reference Macro Attributes” |
>Referenced Waveform Channels | (0040,A0B0) | 1C | List of channels in Waveform to which the reference applies. See Section C.18.5.1.1 Required if the Referenced SOP Instance is a Waveform that contains multiple Channels and not all Channels in the Waveform are referenced.

#### C.18.5.1 Waveform Reference Macro Attribute Descriptions

##### C.18.5.1.1 Referenced Waveform Channels

Referenced Waveform Channels (0040,A0B0) is a multi-value attribute that lists the channels referenced. Each channel is specified as a pair of values (M,C), where the first value is the sequence item number of Waveform Sequence (5400,0100) in the referenced object (i.e., the Multiplex Group Number), and the second value is the sequence item number of Channel Definition Sequence (003A,0200) (i.e., the Channel Number) within the multiplex group.

If the specified channel number is 0, the annotation applies to all channels in the multiplex group.

### Note

As an example, an annotation that applies to the entire first multiplex group and channels 2 and 3 of the third multiplex group would have Referenced Waveform Channels (0040,A0B0) value 0001 0000 0003 0002 0003 0003.

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