1. A method of coding a visual representation of one or more plaque regions in a vessel, said method comprising: segmenting the visual representation of the vessel to identify structures associated with the vessel; classifying at least one region in the vessel as a plaque region and associating a probability to the classified region; displaying the at least one plaque region using a visual highlight selectively associated with the classification for the at least one plaque region; and shading the visual highlight based on the associated probability.