With continuous-wave ultrasound, SPTA equals which intensity?

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Multiple Choice

With continuous-wave ultrasound, SPTA equals which intensity?

Explanation:
In continuous-wave ultrasound the beam is always on, so the duty factor is 1. That means there are no off-times, and pulse-average equals temporal (time) average. The intensity defined by spatial peak with time-average (SPTA) relies on that temporal average, while the intensity defined by spatial peak with pulse-average (SPPA) relies on the same time-average in CW. Since the time-average and pulse-average are identical in continuous-wave conditions, SPPA and SPTA are the same quantity. So the intensity that matches SPTA in CW is SPPA.

In continuous-wave ultrasound the beam is always on, so the duty factor is 1. That means there are no off-times, and pulse-average equals temporal (time) average. The intensity defined by spatial peak with time-average (SPTA) relies on that temporal average, while the intensity defined by spatial peak with pulse-average (SPPA) relies on the same time-average in CW. Since the time-average and pulse-average are identical in continuous-wave conditions, SPPA and SPTA are the same quantity. So the intensity that matches SPTA in CW is SPPA.

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