A catheter for use with magnetic resonance imaging including a catheter body, a radio frequency antenna disposed in a distal end of the catheter body, a first ultrasonic transducer disposed in the distal end of the catheter body and being electrically connected to the radio frequency antenna, an acoustic waveguide disposed in the catheter body and extending from the distal end to a proximal end of the catheter body, the acoustic waveguide being acoustically matched to the first ultrasonic transducer. The catheter also has a second ultrasonic transducer disposed in the proximal end of the catheter body.