UNIT 7

The 13-microsecond rule states that ultrasound travels:

1 cm in 13 µs (round-trip)

The go-return time refers to the time required for a pulse to:

Travel to a reflector and back to the transducer

an echo returning in 26 µs originated from a depth of:

2 cm

If a reflector is located at a depth of 3 cm, the time of flight is approximately:

39 µs

If the time of flight is 78 µs, the reflector depth is:

6 cm

If sound speed in a tissue is slower than assumed, the reflector will appear:

Too deep

A reflector is located 4 cm deep. What is the TOTAL distance traveled by the pulse?

8 cm

A pulse travels a total distance of 12 cm before returning to the transducer. The reflector depth is:

6 cm

If sound speed in a tissue is faster than assumed, the reflector will appear:

too shallow

how do you calculate the depth of reflector in soft tissue?

(1.54 mm/us x go return time) / 2

An echo returns to the transducer after 39 µs. The reflector depth is approximately:

3 cm

An ultrasound system detects an echo at 104 µs. The reflector depth is closest to:

8 cm