If the reflector depth is 4 cm, the time-of-flight is approximately ______.

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Multiple Choice

If the reflector depth is 4 cm, the time-of-flight is approximately ______.

Explanation:
Time-of-flight is the round-trip travel time of the ultrasound pulse to the reflector and back. Use the speed of sound in soft tissue, about 1540 m/s (1.54 mm/µs). A depth of 4 cm is 40 mm one way, so one-way time is 40 ÷ 1.54 ≈ 26 µs. Doubling for the round trip gives ≈ 52 µs. So the reflector depth of 4 cm corresponds to about 52 microseconds of time-of-flight.

Time-of-flight is the round-trip travel time of the ultrasound pulse to the reflector and back. Use the speed of sound in soft tissue, about 1540 m/s (1.54 mm/µs). A depth of 4 cm is 40 mm one way, so one-way time is 40 ÷ 1.54 ≈ 26 µs. Doubling for the round trip gives ≈ 52 µs. So the reflector depth of 4 cm corresponds to about 52 microseconds of time-of-flight.

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