DICOM PS3.3 2018b - Information Object Definitions

C.8.20.4 Segmentation Macros
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#### C.8.20.4 Segmentation Macros

The following sections contain Macros specific to the Segmentation IOD.

##### C.8.20.4.1 Segment Description Macro

Table C.8.20-4 specifies the Attributes of the Segment Description Macro.

Table C.8.20-4. Segment Description Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Segment Number | (0062,0004) | 1 | Identification number of the segment. The value of Segment Number (0062,0004) shall be unique within the Segmentation instance in which it is created. See Section C.8.20.2.4.
Segment Label | (0062,0005) | 1 | User-defined label identifying this segment. This may be the same as Code Meaning (0008,0104) of Segmented Property Type Code Sequence (0062,000F).
Segment Description | (0062,0006) | 3 | User-defined description for this segment.
Segment Algorithm Type | (0062,0008) | 1 | Type of algorithm used to generate the segment. Enumerated Values: AUTOMATIC calculated segment SEMIAUTOMATIC calculated segment with user assistance MANUAL user-entered segment
Include Table 10-7b “Multiple Site General Anatomy Optional Macro Attributes” | May not be necessary if the anatomy is implicit in the Segmented Property Type Code Sequence. More than one Item in Anatomic Region Sequence (0008,2218) may be used when a region of interest spans multiple anatomical locations and there is not a single pre-coordinated code describing the combination of locations. There is no requirement that the multiple locations be contiguous.
Segmented Property Category Code Sequence | (0062,0003) | 1 | Sequence defining the general category of the property the segment represents. Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | Baseline CID 7150 “Segmentation Property Categories”.
Segmented Property Type Code Sequence | (0062,000F) | 1 | Sequence defining the specific property the segment represents. ### Note "Property" is used in the sense of meaning "what the segmented voxels represent", whether it be a physical or biological object, be real or conceptual, having spatial, temporal or functional extent or not. I.e., it is what the segment "is" (as opposed to some feature, attribute, quality, or characteristic of it, like color or shape or size). Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | Baseline CID 7151 “Segmentation Property Types”.
>Segmented Property Type Modifier Code Sequence | (0062,0011) | 3 | Sequence defining the modifier of the property type of this segment. One or more Items are permitted in this Sequence.
>>Include Table 8.8-1 “Code Sequence Macro Attributes” | Defined CID 244 “Laterality”. ### Note For Retinal Segmentation Surfaces, laterality is not typically specified.
Tracking ID | (0062,0020) | 1C | A text label used for tracking a finding or feature, potentially across multiple reporting objects, over time. This label shall be unique within the domain in which it is used. Required if Tracking UID (0062,0021) is present. ### Note May or may not have the same value as Segment Label (0062,0005). Related SR instances may exist, for example, to record measurements related to this segment, but need not exist for this Attribute to be used. This Attribute will have the same value as the value of the (112039, DCM, "Tracking Identifier") Content Item in SR instances that reference this Segment in this Segmentation Instance.
Tracking UID | (0062,0021) | 1C | A unique identifier used for tracking a finding or feature, potentially across multiple reporting objects, over time. Required if Tracking ID (0062,0020) is present. ### Note Related SR instances may exist, for example, to record measurements related to this segment, but need not exist for this Attribute to be used. This Attribute will have the same value as the value of the (112040, DCM, "Tracking Unique Identifier") Content Item in SR instances that reference this Segment in this Segmentation Instance.
Definition Source Sequence | (0008,1156) | 3 | Instances containing the source of the Segment information. Only a single Item is permitted in this Sequence.
>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
>Referenced ROI Number | (3006,0084) | 1C | The value of ROI Number (3006,0022) in the referenced SOP Instance that identifies the ROI that is the origin of the Segment information. Required if Referenced SOP Class UID (0008,1150) is RT Structure Set Storage ("1.2.840.10008.5.1.4.1.1.481.3").

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DICOM PS3.3 2018b - Information Object Definitions