The range equation relates round-trip pulse travel time to distance to the reflector.

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Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

The range equation relates round-trip pulse travel time to distance to the reflector.

Explanation:
The range equation is used to turn how long the ultrasound pulse takes to go to a reflector and back into how far away that reflector is. Because the pulse travels there and back, the one-way travel time is half of the round-trip time. If you know the speed of sound in tissue (about 1540 m/s in soft tissue), you can calculate distance with d = (c × t)/2. So this equation directly yields the distance to the reflector, not its size or how much the signal attenuates. The speed of sound is needed as a constant in the calculation, but the result it gives is the distance.

The range equation is used to turn how long the ultrasound pulse takes to go to a reflector and back into how far away that reflector is. Because the pulse travels there and back, the one-way travel time is half of the round-trip time. If you know the speed of sound in tissue (about 1540 m/s in soft tissue), you can calculate distance with d = (c × t)/2. So this equation directly yields the distance to the reflector, not its size or how much the signal attenuates. The speed of sound is needed as a constant in the calculation, but the result it gives is the distance.

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