DICOM PS3.4 2019a - Service Class Specifications

FF.2.3.3 Internal Structure of Components

FF.2.3.3.1 Internal Structure of Classification Components

Component Type (0070,1802) specifies the component defined in each item of Presentation State Classification Component Sequence (0070,1801), which in turn controls by conditions the rest of the content of the item to provide the necessary specification of the component. The internal structure of each component in block diagram form is as follows:

  • One Input -> RGBA: Specified by Component Type (0070,1802) = ONE_TO_RGBA:

    Internal Structure of One Input -> RGBA Component

    Figure FF.2-6. Internal Structure of One Input -> RGBA Component


  • Two Inputs -> RGBA: If Component Type (0070,1802) = TWO_TO_RGBA:

    Internal Structure of Two Input -> RGBA Component

    Figure FF.2-7. Internal Structure of Two Input -> RGBA Component


The number of most significant bits extracted from each input is specified by the value of Bits Mapped to Color Lookup Table (0028,1403) in the Component Input Sequence (0070,1803) item for that input.

If Component Type (0070,1802) = TWO_TO_RGBA, there shall be two items in Component Input Sequence (0070,1803) with the first item defining the source of the most significant bits of the Palette Color Lookup Table input and the second item defining the source of the least significant bits of the Palette Color Lookup Table input

DICOM PS3.4 2019a - Service Class Specifications