C.8.20.2 Segmentation Image Module
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#### C.8.20.2 Segmentation Image Module

Table C.8.20-2 defines the general Attributes of the Segmentation Image Module.

Table C.8.20-2. Segmentation Image Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Image Type | (0008,0008) | 1 | Value 1 shall be DERIVED. Value 2 shall be PRIMARY. No other values shall be present.
Include Table 10-12 “Content Identification Macro Attributes” |
Samples Per Pixel | (0028,0002) | 1 | Enumerated Values: 1
Photometric Interpretation | (0028,0004) | 1 | Enumerated Values: MONOCHROME2
Pixel Representation | (0028,0103) | 1 | Enumerated Values: 0
Bits Allocated | (0028,0100) | 1 | See Section C.8.20.2.1. Enumerated Values if Segmentation Type (0062,0001) is BINARY: 1 Enumerated Values if Segmentation Type (0062,0001) is not BINARY: 8
Bits Stored | (0028,0101) | 1 | See Section C.8.20.2.1. Enumerated Values if Segmentation Type (0062,0001) is BINARY: 1 Enumerated Values if Segmentation Type (0062,0001) is not BINARY: 8
High Bit | (0028,0102) | 1 | See Section C.8.20.2.1. Enumerated Values if Segmentation Type (0062,0001) is BINARY: 0 Enumerated Values if Segmentation Type (0062,0001) is not BINARY: 7
Lossy Image Compression | (0028,2110) | 1 | Specifies whether an Image has undergone lossy compression (at a point in its lifetime), or is derived from lossy compressed images. Enumerated Values: 00 Image has NOT been subjected to lossy compression. 01 Image has been subjected to lossy compression. Once this value has been set to 01 it shall not be reset. See Section C.8.20.2.2 and Section C.7.6.1.1.5, “Lossy Image Compression”.
Lossy Image Compression Ratio | (0028,2112) | 1C | Describes the approximate lossy compression ratio(s) that have been applied to this image. See Section C.7.6.1.1.5 for further explanation. May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Method (0028,2114). ### Note For example, a compression ratio of 30:1 would be described in this Attribute with a single value of 30. For historical reasons, the lossy compression ratio may also be described in Derivation Description (0008,2111). Required if present in the source images or this IOD instance has been compressed.
Lossy Image Compression Method | (0028,2114) | 1C | A label for the lossy compression method(s) that have been applied to this image. See Section C.7.6.1.1.5 for further explanation. May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Ratio (0028,2112). ### Note For historical reasons, the lossy compression method may also be described in Derivation Description (0008,2111). Required if present in the source images or this IOD instance has been compressed. See Section C.8.20.2.2.
Segmentation Type | (0062,0001) | 1 | The type of encoding used to indicate the presence of the segmented property at a pixel/voxel location. Enumerated Values: BINARY FRACTIONAL See Section C.8.20.2.3.
Segmentation Fractional Type | (0062,0010) | 1C | For fractional segmentation encoding, the meaning of the fractional value. Required if Segmentation Type (0062,0001) is FRACTIONAL. See Section C.8.20.2.3 for Enumerated Values.
Maximum Fractional Value | (0062,000E) | 1C | Specifies the value that represents 100%. There shall be no values in Pixel Data (7FE0,0010) greater than this value. Required if Segmentation Type (0062,0001) is FRACTIONAL.
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” |
>Segment Algorithm Name | (0062,0009) | 1C | Name of algorithm used to generate the segment. Required if Segment Algorithm Type (0062,0008) is not MANUAL.
>Segment Surface Generation Algorithm Identification Sequence | (0066,002D) | 3 | A description of how this segment was derived. Only a single item is permitted in this sequence.
>>Include Table 10-19 “Algorithm Identification Macro Attributes” | Baseline CID 7162 “Surface Processing Algorithm Families”.
>Recommended Display Grayscale Value | (0062,000C) | 3 | A default single gray unsigned value in which it is recommended that the maximum pixel value in this segment be rendered on a monochrome display. The units are specified in P-Values from a minimum of 0000H (black) up to a maximum of FFFFH (white). ### Note The maximum P-Value for this Attribute may be different from the maximum P-Value from the output of the Presentation LUT, which may be less than 16 bits in depth.
>Recommended Display CIELab Value | (0062,000D) | 3 | A default triplet value in which it is recommended that segment be rendered on a color display. The units are specified in PCS-Values, and the value is encoded as CIELab. See Section C.10.7.1.1.

##### C.8.20.2.1 Bits Allocated and Bits Stored

As a consequence of the enumerated Bits Allocated and Bits Stored attribute values, single bit pixels shall be packed 8 to a byte as defined by the encoding rules in PS3.5.

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