1. An apparatus for displaying three-dimensional medical images of a subject comprising: means for storing three-dimensional voxel data representing a three-dimensional image of the subject with voxel values corresponding to a physical property of the subject; means for defining a plurality of object parameter-sets from object parameters for a plurality of objects in the three-dimensional image, each object parameter specifying a spatial region, opacity and color of a corresponding object; means for storing the plurality of object parameter-sets, each object parameter-set specifying a view of the three-dimensional image; means for creating a plurality of view data of the three-dimensional image by applying the plurality of object parameter-sets to the voxel values; means for creating a plurality of views of the three-dimensional image by applying projection-process parameters to the plurality of view data; and means for displaying the plurality of views of the three-dimensional image on an image display unit.