The Current Requested Procedure Evidence Sequence (0040,A375) of the KO instance lists all the SOP Instances referenced in the IMAGE Content Items in their hierarchical Study/Series/Instance context. 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 (see PS3.16).
Note
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Since the image hypertext links in the Section narrative may refer to both an image and a softcopy presentation state, as well as possibly being constrained to specific frame numbers, in general there is not a simple mapping from the <linkHtml> to an entry. Therefore it is not expected that there would be ID reference links between the <linkHtml> and related entries.
The purpose of the Structured Entries is to allow DICOM-aware applications to access the referenced images in their hierarchical context.
The encoding of the DICOM Object References in CDA Entries is shown in Figure X.3-1 and Tables X.3-2 through X.3-6. All of the mandatory data elements for the Entries are available in the Current Requested Procedure Evidence Sequence; optional elements (e.g., instance DateTimes) may also be included if known by the encoding application.
Note
The format of Figure X.3-1 follows the conventions of HL7 v3 Reference Information Model diagrams.
Table X.3-2. DICOM Study Reference in an HL7 V3 Act (CDA Act Entry)
Table X.3-3. DICOM Series Reference in an HL7 V3 Act (CDA Act Entry)
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<Series Instance UID (0020,000E) as root property with no extension property > |
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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 X.3-4) > |
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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 X.3-4.
Table X.3-4. Modality Qualifier for The Series Act.Code
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1.2.840.10008.2.16.4 as codeSystem property, |
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< Modality (0008,0060) as code property, 1.2.840.10008.2.16.4 as codeSystem property, DCM as codeSystemName property, Modality code meaning (from PS3.16) as displayName property> |
Table X.3-5. DICOM Composite Object Reference in an HL7 V3 Act (CDA Observation Entry)
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< SOP Instance UID (0008,0018) as root property with no extension property> |
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< SOP Class UID (0008,0016) as code property, 1.2.840.10008.2.6.1 as codeSystem property, DCMUID as codeSystemName property, SOP Class UID Name (from PS3.6) as displayName property> |
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<application/DICOM as mediaType property, WADO reference (see Table X.3-6) as reference property> |
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Note
Table X.3-6. WADO Reference in an HL7 DGIMG Observation.Text