DICOM PS3.17 2019b - Explanatory Information

X.3.5 Structured Entries

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

  1. Structured Entries are not defined in CDA Release 1.

  2. 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.

CDA Section with DICOM Object References

Figure X.3-1. CDA Section with DICOM Object References


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)

Attribute

Data Type

Multiplicity

Value

classCode

CS

1..1

ACT

moodCode

CS

1..1

EVN

id

II

1..1

<Study Instance UID (0020,000D) as root property with no extension property >

code

CD

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) >

effectiveTime

TS

0..1

< Study Date (0008,0020) and Study Time (0008,0030) >


Table X.3-3. DICOM Series Reference in an HL7 V3 Act (CDA Act Entry)

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 >

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 X.3-4) >

text

ST

0..1

< Series Description (0008,103E) >

effectiveTime

TS

0..1

< Series Date (0008,0021) and Series Time (0008,0031) >


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

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 (from PS3.16) as displayName property>


Table X.3-5. DICOM Composite Object Reference in an HL7 V3 Act (CDA Observation Entry)

Attribute

Data Type

Multiplicity

Value

classCode

CS

1..1

DGIMG

moodCode

CS

1..1

EVN

id

II

1..1

< SOP Instance UID (0008,0018) as root property with no extension property>

code

CD

1..1

< 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>

text

ED

0..1

<application/DICOM as mediaType property,

WADO reference (see Table X.3-6) as reference property>

effectiveTime

TS

0..1

< Content Date (0008,0023) and Content Time (0008,0033) >


Note

  1. The DGIMG class is used to reference all DICOM Composite Instances, not just diagnostic images.

  2. The Observation.Text reference property may alternatively use a DICOM protocol based URI, rather than WADO, should such a URI be defined.

Table X.3-6. WADO Reference in an HL7 DGIMG Observation.Text

WADO Component

Source

<scheme>:// <authority> / <path>

Configuration setting, used by the conversion process, identifying the WADO server

?requestType=WADO

Fixed

&studyUID =<uid>

Study Instance UID for referenced instance

&seriesUID= <uid>

Series Instance UID for referenced instance

&objectUID= <uid>

SOP Instance UID for referenced instance

&contentType=application/DICOM

Fixed


DICOM PS3.17 2019b - Explanatory Information