Systems and methods for ultrasound image rendering are provided. One system includes a user interface having a display configured to display ultrasound images for a volume data set and a content detection module configured to detect an object within the volume data set. The system also includes an image-processing module configured to receive ultrasound signals from a diagnostic probe and process the signals to generate the ultrasound images. The image-processing module is further configured to locally change an opacity function of the displayed ultrasound image based on the detected object to change an opacity of a subset of voxels in the volume data set.
