Question

Echo times are measured by diagnostic ultrasound scanners to determine distances to reflecting surfaces in a patient.Calculate the difference in echo times for tissues located 3.50 cm and 3.60 cm beneath the surface.

a) 0.48 μs
b) 0.96 μs
c) 1.44 μs
d) 1.92 μs

Answer 1

The difference in echo times for tissues located 3.50 cm and 3.60 cm beneath the surface can be calculated using the formula: Difference in Echo Time = Depth Difference / Speed of Sound. The correct option is a) 0.48 μs.

Step-by-step explanation:

The difference in echo times for tissues located 3.50 cm and 3.60 cm beneath the surface can be calculated by using the formula:

Difference in Echo Time = Depth Difference / Speed of Sound

In this case, the depth difference is 3.60 cm - 3.50 cm = 0.10 cm. The speed of sound in human tissues is approximately 1540 m/s, which is equal to 0.154 cm/µs. Therefore, the difference in echo times is:

Difference in Echo Time = 0.10 cm / 0.154 cm/µs = 0.6494 µs

So, the correct option is a) 0.48 μs.