With phased array transducers, the sound beam is swept by what method?

Phased array transducers utilize a method where the timing of the pulses sent to different transducer elements is varied to steer the sound beam. This technique leverages the principle of phase shift, where slight timing adjustments create constructive and destructive interference among the waves produced by the individual elements. By coordinating these delays, the beam can be directed in various orientations, enabling a sweeping motion across the imaging plane.

This approach allows for the creation of high-resolution images while also accommodating the need to visualize different structures within the heart's complex anatomy. It can effectively capture images from multiple angles without physically moving the transducer, making it advantageous in echocardiography and other ultrasonic imaging applications.

The other options do not describe the mechanism of beam steering in phased array transducers. Maintaining a uniform frequency does not influence the direction of the beam, while constant pulse timing would not allow for the necessary adjustments to steer the sound beam. Lastly, changing transducer angles relates more to the physical movement of the transducer rather than the electronic steering method employed in phased array technology.