Fig. 5: Automatic setting of display parameters using presentation states.

Screenshot of the Slim user interface displaying the same grayscale images as shown in Fig. 4, but where the user chose a presentation state, which automatically selected a set of image channels and adjusted the display settings for each channel (upper left). The viewer constructed value of interest and palette color lookup tables from the provided display settings to contrast enhance and colorize referenced grayscale images, respectively, and additively blended the resulting pseudocolor images (upper right). The reference of selected images, the description of the value of interest (VOI) lookup table (LUT), and the description of the palette color lookup table are encoded in a DICOM Advanced Blending Presentation State instance (bottom). In this case, the VOI LUT represents a linear function that maps 16-bit grayscale values into a window of 8-bit grayscale values and the palette color LUT represents three linear functions that each map grayscale values into 8-bit RGB color values. The VOI window is described by the window center and window width and the palette color ranges for the red, green, and blue channels are described separately via two segments that define the first and last color value. The LUT data are encoded in the DICOM object in binary form, but are shown here as text for the purpose of illustration.