1. A method for visualizing a particular surface of an object volume in an overall medical/biological environment, said method comprising the following computer operated steps: receiving a source image data set as pertaining to said overall environment; establishing a first contour surface within said environment, and through using said first contour surface as seed data, establishing a second contour surface within said environment, said first and second contour surfaces collectively defining a target object volume; by way of segmenting, excluding from said image data set all information pertaining to structures outside said target object volume; and visualizing said target object as being based on nonexcluded information; wherein said method includes establishing said second contour surface through combining both voxel intensities and relative positions among voxel subsets, thereby allowing non-uniform spacing between said first and second contour surfaces, and at least said second contour surface is used as a discriminative for said segmenting.