ARDMS Ultrasound Physics & Instrumentation Practice Exam

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What is the duty factor for continuous wave ultrasound?

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The correct answer is: 100%

The duty factor for continuous wave ultrasound is considered to be 100%. This is because continuous wave ultrasound emits sound waves continuously without interruption. The duty factor is defined as the ratio of the time the ultrasound is on (transmitting) to the total time, which includes both the transmitting and receiving time. In the case of continuous wave ultrasound, since the ultrasound is always transmitting, the time the ultrasound is on is equal to the total time, resulting in a duty factor of 1, or 100%. This distinction is critical in ultrasound physics as it indicates that continuous wave methods can be utilized for higher power applications and deeper structures, but they do not provide information about the depth of individual reflectors or range resolution like pulsed wave ultrasound does.