The MRI systems currently in use contain around 1 000 liters of liquid helium to cool the superconductive magnets. If cooling were possible with significantly less helium, there would be no need for the pressure vessel. The systems' inner bore could be larger, bringing benefits to both patients and staff. This goal can be achieved by using magnet wires with the new superconductive material MgB2. It works at much higher temperatures than conventional superconductors, thus making cooling easier.