C.17.6.2 Key Object Document Module
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#### C.17.6.2 Key Object Document Module

Table C.17.6-2 defines the general Attributes of a Key Object Selection Document. These Attributes identify and provide context for the Key Object Selection Document.

Table C.17.6-2. Key Object Document Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Instance Number | (0020,0013) | 1 | A number that identifies the Document.
Content Date | (0008,0023) | 1 | The date the document content creation started.
Content Time | (0008,0033) | 1 | The time the document content creation started.
Referenced Request Sequence | (0040,A370) | 1C | Identifies Requested Procedures to which this Document pertains. One or more Items shall be included in this Sequence. Required if this Document pertains to at least one Requested Procedure.
>Study Instance UID | (0020,000D) | 1 | Unique identifier for the Study.
>Referenced Study Sequence | (0008,1110) | 2 | Uniquely identifies the Study SOP Instance. Zero or one Item shall be included in this Sequence. See Section 10.6.1.
>>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
>Accession Number | (0008,0050) | 2 | A departmental IS generated number that identifies the order for the Study.
>Issuer of Accession Number Sequence | (0008,0051) | 3 | Identifier of the Assigning Authority that issued the Accession Number. Only a single Item is permitted in this Sequence.
>>Include Table 10-17 “HL7v2 Hierarchic Designator Macro Attributes” |
>Placer Order Number/Imaging Service Request | (0040,2016) | 2 | The order number assigned to the Imaging Service Request by the party placing the order.
>Order Placer Identifier Sequence | (0040,0026) | 3 | Identifier of the Assigning Authority that issued the Placer Order Number. Only a single Item is permitted in this Sequence.
>>Include Table 10-17 “HL7v2 Hierarchic Designator Macro Attributes” |
>Filler Order Number/Imaging Service Request | (0040,2017) | 2 | The order number assigned to the Imaging Service Request by the party filling the order.
>Order Filler Identifier Sequence | (0040,0027) | 3 | Identifier of the Assigning Authority that issued the Filler Order Number. Only a single Item is permitted in this Sequence.
>>Include Table 10-17 “HL7v2 Hierarchic Designator Macro Attributes” |
>Requested Procedure ID | (0040,1001) | 2 | Identifier of the related Requested Procedure
>Requested Procedure Description | (0032,1060) | 2 | Institution-generated administrative description or classification of Requested Procedure.
>Requested Procedure Code Sequence | (0032,1064) | 2 | A sequence that conveys the requested procedure. Zero or one Item shall be included in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | No Baseline CID is defined.
Current Requested Procedure Evidence Sequence | (0040,A375) | 1 | List of all Composite SOP Instances referenced in Content Sequence (0040,A730), including all presentation states, real world value maps and other accompanying composite instances that are referenced from the content items. One or more Items shall be included in this Sequence. ### Note In the context of the Key Object Selection, the current evidence is considered to be only the set of instances referenced within the Key Object Selection.
>Include Table C.17-3 “Hierarchical SOP Instance Reference Macro Attributes” |
Identical Documents Sequence | (0040,A525) | 1C | Duplicates of this document, stored with different SOP Instance UIDs. One or more Items shall be included in this Sequence. Required if this Key Object Selection document references instances in more than one Study. See Section C.17.2.2 and Section C.17.6.2.1 for further explanation and conditions.
>Include Table C.17-3 “Hierarchical SOP Instance Reference Macro Attributes” |

##### C.17.6.2.1 Identical Documents

If the Current Requested Procedure Evidence Sequence (0040,A375) references SOP Instances both in the current study and in one or more other studies, this document shall be duplicated into each of those other studies, and the duplicates shall be referenced in the Identical Documents Sequence (0040,A525).

### Note

Thus a Key Object Selection Document that references images in the current study as well as in a prior or comparison study, would be duplicated into the other study. This allows an application displaying that other study to easily access notes relevant to that study's SOP Instances.

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