DICOM PS3.17 2024c - Explanatory Information

C.6.2 Channel Definition

The Waveform Module Channel Definition sequence Attribute (003A,0200) is defined in harmonization with the HL7 Channel Definition (CD) Data Type, in accordance with the following Table. Each Item in the Channel Definition sequence Attribute corresponds to an OBX Segment of subtype CHN.

Table C.6-1. Correspondence Between DICOM and HL7 Channel Definition

DICOM Attribute


HL7 CD Data Type Component

Waveform Channel Number


Channel Identifier (number&name)

Channel Label


Channel Source Sequence


Waveform Source

Channel Source Modifier Sequence


Channel Sensitivity


Channel Sensitivity and Units

Channel Sensitivity Units Sequence


Channel Sensitivity Correction Factor


Channel Calibration Parameters


Channel Baseline


Channel Time Skew


[Group] Sampling Frequency


Channel Sampling Frequency

Channel Minimum Value


Minimum and Maximum Data Values

(minimum & maximum)

Channel Maximum Value


Channel Offset


not defined in HL7

Channel Status


Filter Low Frequency


Filter High Frequency


Notch Filter Frequency


Notch Filter Bandwidth


In the DICOM information object definition, the sampling frequency is defined for the multiplex group, while in HL7 it is defined for each channel, but is required to be identical for all multiplexed channels.

Note that in the HL7 syntax, Waveform Source is a string, rather than a coded entry as used in DICOM. This should be considered in any transcoding between the two formats.

DICOM PS3.17 2024c - Explanatory Information