Mod 1 Unit 2 (Speed & Ranging for Location)

Question 1

Range

Answer 1

distance from transducer to echo generating structure

Question 2

To position an echo properly what information is required?

Answer 2

1. direction where echo came
2. distance to the reflector

Question 3

Ultrasound unit assumes what propagation speed?

Answer 3

1540m/s
1.54mm/usec

Question 4

Range equation

Answer 4

distance = time x velocity

Question 5

Why is the range equation not accurate?

Answer 5

round trip effect and go return time

Question 6

Complete range equation

Answer 6

distance = 1/2 (propagation speed x pulse round trip time)

Question 7

In soft tissue round trip time is

Answer 7

13usec/cm