C.17.6 Key Object Selection Modules
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### C.17.6 Key Object Selection Modules

#### C.17.6.1 Key Object Document Series Module

Table C.17.6-1 defines the Attributes of the Key Object Document Series.

### Note

Series of Key Object Selection Documents are separate from Series of Images or other Composite SOP Instances. Key Object Documents do not reside in a Series of Images or other Composite SOP Instances.

Table C.17.6-1. Key Object Document Series Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Modality | (0008,0060) | 1 | Modality type. Enumerated Values: KO Key Object Selection
Series Instance UID | (0020,000E) | 1 | Unique identifier of the Series. ### Note No specific semantics are specified.
Series Number | (0020,0011) | 1 | A number that identifies the Series. ### Note No specific semantics are specified.
Series Date | (0008,0021) | 3 | Date the Series started.
Series Time | (0008,0031) | 3 | Time the Series started.
Protocol Name | (0018,1030) | 3 | Description of the conditions under which the Series was performed. ### Note This may represent the type of analysis used in creation of the KO SOP Instances.
Series Description | (0008,103E) | 3 | Description of the Series
Series Description Code Sequence | (0008,103F) | 3 | A coded description of the Series. Only a single Item is permitted in this sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | No Baseline CID is defined.
Referenced Performed Procedure Step Sequence | (0008,1111) | 2 | Uniquely identifies the Performed Procedure Step SOP Instance for which the Series is created. Zero or one item shall be included in this sequence. ### Note See notes on this attribute in Section C.17.1
>Include Table 10-11 “SOP Instance Reference Macro Attributes” |

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