1. A system for equalizing tissue information in medical diagnostic ultrasound imaging, the system comprising: a processor operable to determine a hypersurface as a function of ultrasound data representing a volume and operable to map the data to output values as a function of the hypersurface; and a display operable to display an image responsive to the output values; wherein the processor is configured to identify different types of soft tissue in the data representing the volume, the different types of soft tissue being identified as different from each other, the processor configured to determine the hypersurface for one of the different types of soft tissue and to determine an additional hypersurface for another one of the different types of soft tissue, and the processor configured to map the data to the output values as a function of both the hypersurface and the additional hypersurface, the processor configured to map by selecting between the hypersurface and the additional hypersurface for each voxel, by using the hypersurface for a first type of setting and use the additional hypersurface for a second type of setting, by mapping with two different target tissue levels, by combining the hypersurface and the additional hypersurface, or by using the hypersurface for a first rendering and using the additional hypersurface for a second rendering.