1. A method of generating, from captured medical image data of a subject, a modified intensity projection image for display, the method comprising: supplying captured image data to a computerized processor and, in said processor, obtaining an intensity projection image data set from the captured image data; in said processor, also obtaining a secondary image data set from the captured image data; in said processor, determining a region of interest in the secondary image data set; in said processor, determining a surface of the region of interest; in said processor, combining the intensity projection image data set and the region of interest surface to generate the modified intensity projection image for display, by blending the complete intensity projection image data set with only a portion of the secondary image data set, said portion delineated by the region of interest surface to produce a visual representation of the region of interest in the modified intensity projection image for display; and making said modified intensity projection image for display available in electronic form as a data file at an output of said processor.