For every 13 ,µs of go-return time, the object creating the reflection is ______ deeper in soft tissue.

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Multiple Choice

For every 13 ,µs of go-return time, the object creating the reflection is ______ deeper in soft tissue.

Explanation:
In soft tissue, the time for a ultrasound pulse to travel to a reflector and back is tied to depth by the speed of sound. The speed of sound in soft tissue is about 1540 m/s, which is roughly 1.54 mm per microsecond. For a go-return time of 13 microseconds, the pulse travels about 1.54 mm/µs × 13 µs ≈ 20 mm in total. Since this is a round trip, the depth is half of that, about 10 mm, or 1 cm. So the reflection comes from about 1 cm deeper in soft tissue. If the depth were 0.5 cm, the go-return time would be around 6.5 µs; for 2 cm, about 26 µs. That’s why 1 cm is the correct depth for a 13 µs go-return time.

In soft tissue, the time for a ultrasound pulse to travel to a reflector and back is tied to depth by the speed of sound. The speed of sound in soft tissue is about 1540 m/s, which is roughly 1.54 mm per microsecond. For a go-return time of 13 microseconds, the pulse travels about 1.54 mm/µs × 13 µs ≈ 20 mm in total. Since this is a round trip, the depth is half of that, about 10 mm, or 1 cm. So the reflection comes from about 1 cm deeper in soft tissue.

If the depth were 0.5 cm, the go-return time would be around 6.5 µs; for 2 cm, about 26 µs. That’s why 1 cm is the correct depth for a 13 µs go-return time.

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