Ultrasound is the method of choice for many inter-ventions, especially in the abdomen, mainly because of the real-time visualization of the procedure.Most of the liver masses could be precisely localized and biopsied under ultrasound and different methods of tumor ablation which could be performed with ultrasound guidance have been introduced. However, there are some small hepatocellular carcinomas or metastatic lesions, which are well seen on CT scan images but could not be proficiently localized with sonography.Fusion of CT or MR images of the abdomen shows the lesion. Ultrasound imaging is possible in a Virtual navigator System in these cases in which biopsy or RF tumor ablation is possible with US guidance.In this presentation, the method of image fusion and some interesting cases are discussed.-Fusion of CT or MR images of abdomen, which show the lesion, and the ultrasound images is possible in a Virtual navigator System in these cases and biopsy or RF tumor ablation is possible with US guidance.