DICOM PS3.3 2024e - Information Object Definitions
C.8.20.2.3 Segmentation Type, Segmentation Fractional Type and Segments Overlap (Current)
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PS3.3 > Information Module Definitions (Normative) > Modality Specific Modules > Segmentation > Segmentation Image Module > Segmentation Type, Segmentation Fractional Type and Segments Overlap
C.8.20.2.3 Segmentation Type, Segmentation Fractional Type and Segments Overlap
C.8.20.2.3.1 BINARY Segmentation Type

A Segmentation Type (0062,0001) of BINARY indicates that the segmented property is present with a value of 1 and absent with a value of 0.

C.8.20.2.3.2 FRACTIONAL Segmentation Type

For a Segmentation Type (0062,0001) of FRACTIONAL the segmented property is defined as a value from zero to the Maximum Fractional Value (0062,000E). A FRACTIONAL segmentation shall be further specified via Segmentation Fractional Type (0062,0010).

Enumerated Values of Segmentation Fractional Type (0062,0010):

PROBABILITY

Defines the probability, as a ratio of the pixel value to the Maximum Fractional Value, that the segmented property occupies the spatial area defined by the voxel.

OCCUPANCY

Defines the proportion of the pixel volume occupied by the segmented property as the ratio of the pixel value to the Maximum Fractional Value.

C.8.20.2.3.3 LABELMAP Segmentation Type

A Segmentation Type (0062,0001) of LABELMAP indicates that the presence of the segmented property is conveyed by the integer value of the Pixel Data (7FE0,0010), which is one of the values of Segment Number (0062,0004).

Note

BINARY Segmentation Instances may be transformed into or from label maps. This conversion is facilitated by knowing whether or not any Segment bitplanes overlap. By definition, each pixel value in a single LABELMAP Segmentation Instance can only represent one Segment. and cannot overlap. A Segments Overlap (0062,0013) value of NO indicates that they can be converted into (or may have been converted from) a label map representation without the need to check every pixel.

For a Segmentation Type (0062,0001) of LABELMAP, every pixel value actually encoded in Pixel Data (7FE0,0010) is required to be described in an Item of Segment Sequence (0062,0002).

Note

  1. The converse is not true, in that the Segment Sequence (0062,0002) can describe Segments that are not actually present in the pixel data, e.g., to allow for re-use of a common Segment description across multiple instances, despite the inefficiency of encoding unused information.

  2. The need to describe every pixel value implies that the value 0, if used, will also be described, which might serve as the background.

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C.8.20.2.2 Lossy Image Compression and Lossy Image Compression Method  Home  C.8.20.2.4 Segment Number
DICOM PS3.3 2024e - Information Object Definitions