This procedure uses generally lower frequencies than medical diagnostic ultrasound (250–2000 kHz), but significantly higher time-averaged intensities. The treatment is often guided by Magnetic Resonance Imaging (MRI); the combination is then referred to as Magnetic resonance-guided focused ultrasound (MRgFUS).
A method utilizing lower frequencies than standard medical ultrasound (250–2000 kHz) but higher energy levels is used. This treatment is typically directed by Magnetic Resonance Imaging (MRI); the combination is then known as Magnetic resonance-guided focused ultrasound (MRgFUS).