Which term refers to the amount of time a system takes to complete one cycle of ultrasound?

The term that refers to the amount of time a system takes to complete one cycle of ultrasound is known as the period. In ultrasound physics, the period is defined as the duration of time it takes for one complete wave cycle to occur, measured in microseconds for ultrasound waves.

Understanding the concept of period is essential, as it is inversely related to frequency; as frequency increases, the period decreases. Frequency, which is another term listed, refers to how many cycles occur in one second, making the two concepts interconnected.

Wavelength is a separate term that describes the physical distance between consecutive peaks of a wave, typically measured in millimeters, and amplitude refers to the maximum extent of a wave's oscillation from its rest position, often related to the strength or intensity of the wave. Thus, the period is clearly defined as the time taken for one complete cycle, making it the correct answer in this context.