DICOM PS3.16 2021b - Content Mapping Resource

7 DCMR Context Group Specifications (Current)
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# 7 DCMR Context Group Specifications

Context Groups specify Value Set restrictions for Code Value (0008,0100) (or Long Code Value (0008,0119) or URN Code Value (0008,0120)) and Code Meaning (0008,0104) of Code Sequence Attributes for given functional or operational contexts. This Section specifies the semantics of DCMR Context Group Tables.

## 7.1 Context Group Table Field Definition

Context Groups are described using tables of the following form (optional columns are shown with italic column titles):

Resources:

  HTML | FHIR JSON | FHIR XML | IHE SVS XML

Type:

  (Non-) Extensible

Version:

  <yyyymmdd>

UID:

  1.2.840.10008.6.1.uuuu

Table CID <#>. <Context Group Name>

Coding Scheme Designator | Coding Scheme Version | Code Value | Code Meaning | <Reference Terminology> Equivalent Value | Units
--- | --- | --- | --- | --- | ---
... | ... | ... | ... | ... | ...
... | ... | ... | ... | ... | ...

A row of a Context Group table specifies one coded concept. Each Context Group table is named by a title and identified by a CID number and version.

The columns of the tables consist of:

- Coding Scheme Designator: the value of Coding Scheme Designator (0008,0102)

- Code Value: the value of Code Value (0008,0100) or Long Code Value (0008,0119) or URN Code Value (0008,0120)

- Coding Meaning: the value of Code Meaning (0008,0104)

In those cases where it is necessary, Coding Scheme Version (the value of Coding Scheme Version (0008,0103)) may also be specified. This column may be absent if Coding Scheme Version is not required for any of the coded concepts in the Context Group.

The value specified in the Code Meaning field is an acceptable value for the specified code value, but does not preclude the use of other synonymous text in the same or other language.

### Note

1. Some coding schemes do not specify the equivalent of a Code Meaning.

2. Capitalization in the Code Meaning is generally not significant, except for abbreviations used in units of measurement prefixes (e.g., “ml” milliliter vs. “Ml” megaliter, or “pV” picovolt vs. “PV” petavolt).

If further description of the concept represented by the code is required in the DCMR (rather than referring to an external coding scheme), it is included in a separate table.

Optional columns may provide an informative mapping from the coded concepts of the Context Group to a reference terminology specified in the column heading. Typical reference terminologies include SNOMED CT and UMLS.

An optional column may provide a normative baseline or defined set of units to use for numeric measurements using the concept, either as a single term (e.g., DT ({ratio}, UCUM, "ratio")), a list of such terms, or a reference to a Context Group (e.g., DCID 7277 "Units of Diffusion Rate Area Over Time").

A Context Group may alternatively be defined by narrative reference to an externally defined coding scheme.

### Note

See for instance CID 82 “Units of Measurement”.

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6.2.5 Extension of Templates | Home | 7.2 Special Conventions for Context Group Tables

DICOM PS3.16 2021b - Content Mapping Resource