Abstract: Methods of imaging a portion of a body of a patient are provided. In the methods, a contrast agent including an iso-osmotic contrast agent is administered to the patient. In a preferred embodiment, the iso-osmotic contrast agent comprises polyethylene glycol (PEG) and electrolytes, which make the PEG iso-osmotic. In a preferred embodiment, a positive contrast agent, such as an iodine-based contrast agent, is added to the PEG. The iso-osmotic contrast agent can be administered in volumes that are lower than previous contrast agents. The iso-osmotic contrast agent can be administered in combination with a positive intravenous contrast agent. At least one image of the portion of the patient's body is obtained, such as by computed tomography, after the contrast agent is administered. The methods can be used to image a pelvis, GI tract, and/or appendix of the patient. Iso-osmotic contrast agents are also provided.

Abstract: Efficient ablation with multiple prong electrodes is obtained by electrically isolating the prongs from each other and rapidly switching electric power between the prongs, between a prong and a ground pad, or both. In this way, power distribution to a tumor can be controlled efficiently without the need to change probe geometry.

Abstract: A method and apparatus for reducing bleeding in biopsy procedures provides a cauterizing electrical current through an introducer needle as the needle is withdrawn. A majority of the length of the introducer needle may be insulated to concentrate the cauterization at its tip, and a field smoothing cauterizing stylet may be used in conjunction with the tube to provide more even cauterization and/or instrumentation to monitor cauterization. Cauterization may be controlled by the speed of withdrawal of the introducer needle as guided manually or automatically by the instrumentation.