Source:http://linkedlifedata.com/resource/umls/id/C0879161
UMD: Ultrasound therapy systems usually designed for thermal ablation of tissue. These systems typically consist of a radio-frequency generator (frequency typically from 0.5 to 4.5 MHz), electroacoustical transducers (e.g., piezoelectric crystals) and a delivery system. Some systems use ultrasound or magnetic resonance guidance to control and/or evaluate tissue ablation. The high-intensity focused ultrasound mechanical energy is absorbed by tissue; ablation is mostly produced by coagulation necrosis at temperatures over 60 degrees C. Most of these systems are used for focused noninvasive ablation of tumor tissues not blocked by bone (e.g., breast, bladder).