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
Keyword:: <Context Group Keyword>
FHIR Keyword:: dicom-cid-<#>-<Context Group Keyword>
Type:: (Non-) Extensible
Version:: <yyyymmdd> or Not versioned
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
identified by a CID number
identified by a version
identified by a Keyword
identified by a FHIR Keyword
assigned a UID (that is defined in PS3.6)
linked to various resource files that contain representations of the Context Group (in FHIR JSON, FHIR XML and IHE SVS XML)

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

Some coding schemes do not specify the equivalent of a Code Meaning.
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 “Measurement Unit”.

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