DICOM PS3.3 2019b - Information Object Definitions

C.8.20.2.3 Segmentation Type, Segmentation Fractional Type and Segments Overlap (Current)
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##### C.8.20.2.3 Segmentation Type, Segmentation Fractional Type and Segments Overlap

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

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.

### Note

Binary segmentation instances may be transformed into or from "label maps", in which each pixel contains a coded value that indicates the segment, rather than the Segmentation IOD representation that encodes separate bitplanes for each segment. This conversion is facilitated by knowing whether or not any segment bitplanes overlap. A Segments Overlap (0062,0013) value of NO indicates they can be converted into (or may have been converted from) a label map representation without the need to check every pixel.

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DICOM PS3.3 2019b - Information Object Definitions