A.7 HL7 V3 DICOM CMETS
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## A.7 HL7 V3 DICOM CMETS

### A.7.1 A_DicomSequence minimal (COCT_RM830110UV)

Figure A.7-1. A_DicomSequence minimal CMET

The A_DicomSequence minimal CMET is used to reference DICOM composite objects within HL7 Version 3 messages. It provides a single location for the identifying information of the study/series/instance hierarchical context of DICOM composite objects that are referenced for a specific purpose. Additional information on this context (e.g., Study Description) may optionally be added. Mappings from DICOM object attributes to the various Act attributes are provided. The CMETs for the HL7 V3 message sequence and the CDA Release 2 section are structurally identical. For the CDA section pattern different clone names are used according to the specified entry names of CDA Release 2.

### Note

The A_DicomSequence minimal CMET may be used in combination with COCT_RM830120 to provide additional structured information on individual references to DICOM composite objects. COCT_RM830120 is used to put the references into the context of other acts and observations (e.g., relate referenced DICOM images to lab observations).

The following description of the act classes and act relationships contains the attribute mappings of HL7 V3 attributes to DICOM (Digital Imaging and Communications in Medicine) tags. The group and element number of the mapped DICOM tags are listed in parenthesis. The CDA mappings specify the use of the CMET act classes and act relationships for a CDA Release 2 document section that contains section entries.

#### A.7.1.1 Sequence

The DICOM Objects Sequence contains the identifying information on DICOM composite objects referenced in a HL7 V3 message for a specific purpose. The sequence can be used for any HL7 V3 message that includes references to composite DICOM objects, such as images and structured reports. Information on one or more referenced DICOM composite objects on the study, series and instance level can be included in a sequence.

Table A.7.1-1. Sequence Act

Attribute | Data Type | Multiplicity | Value
--- | --- | --- | ---
classCode | CS | 1..1 | ACT
moodCode | CS | 1..1 | EVN
id | II | 0..1 | Sequence Identifier
code | CE | 1..1 | Externally defined DICOM codes, e.g., <121181 as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, e.g., "DICOM Object Catalog" as displayName property>
title | ST | 0..1 | <e.g., "DICOM Object Catalog">

##### A.7.1.1.1 CDA Mapping (Class Name and Attributes used for CDA Documents)

Section (replaces Sequence)

The CDA DICOM Objects Section contains the identifying information on DICOM composite objects referenced in a CDA Release 2 document for a specific purpose. The CDA DICOM Objects Section can be used within any CDA Release 2 document that includes references to composite DICOM objects in the structured part of the CDA document, such as images and structured reports. Information on one or more referenced DICOM composite objects on the study, series and instance level can be included in this section.

Table A.7.1-2. Section Act

Attribute | Data Type | Multiplicity | Value
--- | --- | --- | ---
classCode | CS | 1..1 | ACT
moodCode | CS | 1..1 | EVN
id | II | 0..1 | Section Identifier
code | CE | 1..1 | Externally defined DICOM codes, e.g., <121181 as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, e.g., "DICOM Object Catalog" as displayName property>
title | ST | 0..1 | <e.g., "DICOM Object Catalog">

Section X.3.5 Structured Entries in PS3.17 specifies the semantics of the section e.g., "DICOM Object Catalog" (DICOM Code Value: 121181) that contains information on the full set of DICOM composite objects referenced in the CDA document:

“It is recommended that this list be transcoded to CDA Entries in a Section with Section.Title "DICOM Object Catalog" and a Section.Code of 121181 from the DICOM Controlled Terminology (refer to PS3.16).”

#### A.7.1.2 ActRelationship COMPONENT (Sequence to Study)

This actRelationship "COMPONENT" is used to link Sequence with one or more associated study acts.

##### A.7.1.2.1 CDA Mapping (ActRelationship Name and Attributes used for CDA Documents)

- ActRelationship Clone name: entry (replaces COMPONENT)

- ActRelationship.typeCode: x_ActRelationshipEntry (Constraint: Fixed value = COMP)

- ContextConductionInd: "true"

#### A.7.1.3 Study

The Study act class contains the DICOM study information that defines the characteristics of a referenced medical study performed on a patient. A study is a collection of one or more series of medical images, presentation states, SR documents, overlays and/or curves that are logically related for the purpose of diagnosing a patient. Each study is associated with exactly one patient. A study may include composite instances that are created by a single modality, multiple modalities or by multiple devices of the same modality. The study information is modality independent.

Table A.7.1-3. DICOM Study Reference in an HL7 V3 Act

Attribute | Data Type | Multiplicity | Value
--- | --- | --- | ---
classCode | CS | 1..1 | ACT
moodCode | CS | 1..1 | EVN
templateId | LIST<II> | 1..* |
id | II | 1..1 | <Study Instance UID (0020,000D) as root property with no extension property>: Unique identifier for the Study
code | CV | 1..1 | <113014 as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, "DICOM Study" as displayName property>
text | ST | 0..1 | <Study Description (0008,1030) > Institution-generated description or classification of the Study (component) performed.
effectiveTime | TS | 0..1 | <Study Date (0008,0020): Date the Study started; and Study Time (0008,0030): Time the Study started.>

##### A.7.1.3.1 CDA Mapping (Class Name and Attributes used for CDA Documents)

- Act clone name of the CDA entry is "Act" instead of "Study". The attributes and attribute values of this CDA entry "Act" are identical to those listed in table 3.

- templateId value (Table A.7.1-3): Set root portion of II to "2.16.840.1.113883.10.20.6.2.6"

  (identifies the template that defines constraints on "Study Act" of CDA Diagnostic Imaging Reports as specified by CDA R2 DIR IG).

#### A.7.1.4 ActRelationship COMPONENT (Study to Series)

This actRelationship "COMPONENT" is used to link one study act with one or more associated series acts.

##### A.7.1.4.1 CDA Mapping (ActRelationship Name and Attributes used for CDA Documents)

- ActRelationship Clone name: entryRelationship (replaces COMPONENT)

- ActRelationship.typeCode: x_ActRelationshipEntry (Constraint: Fixed value = COMP)

- ActRelationship.contextControlCode: "AP" (Additive Propagating)

- ContextConductionInd: "true"

#### A.7.1.5 Series

The Series act class contains the DICOM series information for referenced DICOM composite objects. The series information defines the attributes that are used to group composite instances into distinct logical sets. Each series is associated with exactly one study.

Table A.7.1-4. DICOM Series Reference in an HL7 V3 Act

Attribute | Data Type | Multiplicity | Value
--- | --- | --- | ---
classCode | CS | 1..1 | ACT
moodCode | CS | 1..1 | EVN
id | II | 1..1 | < Series Instance UID (0020,000E) as root property with no extension property>: Unique identifier of the Series.
code | CD | 0..1 | <113015 as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, "DICOM Series" as displayName property, Modality as qualifier property (see text and Table A.7.1-5) >
text | ST | 0..1 | < Series Description (0008,103E)> User provided description of the Series
effectiveTime | TS | 0..1 | < Series Date (0008,0021): Date the Series started. and Series Time (0008,0031): Time the Series started.>

The code for the Act representing a Series uses a qualifier property to indicate the modality. The qualifier property is a list of coded name/value pairs. For this use, only a single list entry is used, as described in Table A.7.1-5.

Table A.7.1-5. Modality Qualifier for the Series Act.code

Property | Data Type | Value
--- | --- | ---
name | CV | <121139 as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, "Modality" as displayName property>
value | CD | < Modality (0008,0060) as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, Modality code meaning (PS3.16) as displayName property>

##### A.7.1.5.1 CDA Mapping (Class Name and Attributes used for CDA Documents)

- Act Clone Name: Act

- Act clone name of the CDA entry is "Act" instead of "Series". The attributes and attribute values of this CDA entry "Act" are identical to those listed in Table A.7.1-4 and Table A.7.1-5.

#### A.7.1.6 ActRelationship COMPONENT (Series to SopInstance)

This actRelationship "COMPONENT" is used to link one series act with one or more associated SopInstance acts.

##### A.7.1.6.1 CDA Mapping (ActRelationship Name and Attributes used for CDA Documents)

- ActRelationship Clone name: entryRelationship (replaces COMPONENT)

- ActRelationship.typeCode: x_ActRelationshipEntry (Constraint: Fixed value = COMP)

- ActRelationship.contextControlCode: "AP" (Additive Propagating)

- ContextConductionInd: "true"

#### A.7.1.7 SopInstance

Please refer to COCT_RM830120UV for the description of the SopInstance act class.

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