1. A method for providing an interface for polyp annotation, segmentation, and measuring in computed tomography colonography (CTC) volumes, comprising: receiving an initial polyp location in a CTC volume; automatically segmenting a polyp in the CTC volume based on the initial polyp location; displaying the segmented polyp in the CTC volume in a user interface; receiving a user input via the user interface to modify the segmented polyp; and re-segmenting the segmented polyp based on the received user input.