H.2.1.2.1 Modality and User Specific Transformations

Examples of these transformations are Modality LUT, Mask Subtraction, and VOI LUT.

The Modality LUT transforms manufacturer dependent pixel values into pixel values which are meaningful for the modality and which are manufacturer independent.

The VOI LUT transforms the modality pixel values into pixel values which are meaningful for the user or the application. For example it selects of a range of pixel values to be optimized for display, such as soft tissue or bone windows in a CT image.