1. An imaging device, comprising: an elongate tubular body including a distal elongate acoustic window, the tubular body forming an imaging lumen and a pull wire lumen; an imaging core disposed in the imaging lumen, the imaging core including a drive cable and a distally disposed ultrasonic transducer, the transducer being disposed in the acoustic window and rotatably and longitudinally movable relative to the acoustic window; and a pull wire disposed in the pull wire lumen, the pull wire being mechanically coupled to the acoustic window.