Time-of-flight in ultrasound refers to what?

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Multiple Choice

Time-of-flight in ultrasound refers to what?

Explanation:
Time-of-flight is the round-trip travel time of the ultrasound pulse—from the transducer to a reflector (tissue boundary) and back to the transducer. This two-way travel time, together with the known speed of sound, lets us calculate depth with depth = (speed × time) / 2, since the pulse travels there and back. For example, in soft tissue around 1540 m/s, a round-trip time of about 13 microseconds corresponds to roughly 1 cm of depth. Different tissues have different speeds, so depth accuracy depends on the assumed speed. The time to generate the pulse or the time between pulses are different timing concepts and not the time-of-flight.

Time-of-flight is the round-trip travel time of the ultrasound pulse—from the transducer to a reflector (tissue boundary) and back to the transducer. This two-way travel time, together with the known speed of sound, lets us calculate depth with depth = (speed × time) / 2, since the pulse travels there and back. For example, in soft tissue around 1540 m/s, a round-trip time of about 13 microseconds corresponds to roughly 1 cm of depth. Different tissues have different speeds, so depth accuracy depends on the assumed speed. The time to generate the pulse or the time between pulses are different timing concepts and not the time-of-flight.

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