C.8.23 Surface Segmentation
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### C.8.23 Surface Segmentation

This section describes the specific modules for the Surface Segmentation IOD.

#### C.8.23.1 Surface Segmentation Module

Table C.8.23-1 defines the general Attributes of the Surface Segmentation Module.

Table C.8.23-1. Surface Segmentation Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Include Table 10-12 “Content Identification Macro Attributes” |
Content Date | (0008,0023) | 1 | The date the content creation started.
Content Time | (0008,0033) | 1 | The time the content creation started.
Segment Sequence | (0062,0002) | 1 | Describes the segments that are contained within the data. One or more Items shall be included in this sequence.
>Include Table C.8.20-4 “Segment Description Macro Attributes” |
>Surface Count | (0066,002A) | 1 | The number of surfaces that comprise this segment. Shall be greater than zero.
>Referenced Surface Sequence | (0066,002B) | 1 | Sequence referencing the surfaces composed to construct this segment. One or more Items shall be included in this sequence. The number of Items shall equal the value of Surface Count (0066,002A).
>>Referenced Surface Number | (0066,002C) | 1 | Identifies the Surface Number (0066,0003) within the Surface Sequence (0066,0002) to which this reference applies.
>>Segment Surface Generation Algorithm Identification Sequence | (0066,002D) | 1 | A description of how this segment surface was derived. Only a single Item shall be included in this sequence.
>>>Include Table 10-19 “Algorithm Identification Macro Attributes” | For Algorithm Family Code Sequence (0066,002F) Baseline CID 7162 “Surface Processing Algorithm Families”.
>>Segment Surface Source Instance Sequence | (0066,002E) | 2 | A Sequence that identifies the set of Instances by their SOP Class/Instance pair that were used to derive this segment surface. Zero or more items shall be included in this Sequence.
>>>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |

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