[Magnetic resonance imaging (MRI)-directed focussed ultrasound. Methods and applications in oncological treatment].

Focussed ultrasound is the only known technology that allows non-invasive local hyperthermia. Since MRI may be employed to obtain real-time temperature maps non-invasively, the combination of these two technologies offers great advantages, specifically aimed towards oncological studies. Real-time identification of the target region and accurate control of the temperature evolution during the treatment are now possible.