title: Ultrasonic therapy products: radiation safety performance standard.
mesh_terms: D006801:Humans; D026741:Physical Therapy Modalities / Q000295:instrumentation; D011835:Radiation Protection / Q000592:standards*; D014464:Ultrasonic Therapy / Q000295:instrumentation* / Q000592:standards; D014481:United States; D014486:United States Food and Drug Administration