a therapy head for use in hifu procedures is described . the therapy head has an enclosure with a window , an energy applicator and a means of moving the energy applicator within the enclosure . the therapy head uses motors and actuators to move the energy applicator , usually an ultrasound transducer , inside the enclosure . a controller is provided either internally or externally that allows the therapy head to identify and distinguish locations where the therapy head should be to radiate energy into a patient . the controller uses the motors and actuators to move the energy applicator into the desired locations .