 Image-guided surgery is a new technology, which is used to create 3-D pictures that generate a map of the liver. This map will allow surgeons to know the exact anatomical location of their instruments, including instances when direct visualization is not possible. This study is designed to determine the safety and feasibility of using image-guided techniques for treatment of liver tumors. The overall goal of this study is to use image-guided surgery for the improvement of the surgeons ability to remove liver tumors. 