An ultrasound transducer apparatus includes an ultrasound transducer array consisting of multiple ultrasound transducer elements. The ultrasound transducer array is adapted for receiving and transmitting an ultrasound wave. A pulse controller is adapted for outputting multiple pulse signals to control the ultrasound transducer elements, respectively. By delaying output of the pulse signals, a plane wavefront of a transmitted ultrasound is controlled to have a different propagation direction. The pulse controller is able to activate part of the ultrasound transducer elements, corresponding to a region of interest for ultrasound wave receiving and transmitting.
