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Question: 1 / 400

While assuming continuous wave (cw) ultrasound, what is the duty factor (DF)?

0.2%

1%

0%

100%

In continuous wave (CW) ultrasound, the duty factor (DF) refers to the ratio of time the ultrasound is actually on (transmitting) compared to the total time. In the case of continuous wave ultrasound, the ultrasound is transmitting 100% of the time, meaning the duty factor is 100%. This continuous transmission allows for the detection of high-velocity blood flow, as opposed to pulsed wave ultrasound where transmission is interrupted to allow for reception of echoes. Therefore, option D (100%) is the correct answer.

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