Quiz 3 Review

Question 1

Which of the following instruments is responsible for FFT analysis?

1. Beam former
2. Spectrum analyzer
3. Signal processor
4. Image processor

Answer 1

Spectrum analyzer

Question 2

Which of the following doppler shifts has the highest agnitude?

1. 1000hz
2. 900hz
3. -1000Hz
4. -900Hz

Answer 2

1 and 3

Question 3

List the factors that affect the amplitude of the doppler shifts.

Answer 3

1. Red blood cell density
2. Power
3. Velocity
4. Gain

Question 4

Explain why a sample volume placed at a deeper depth has the potential to return a more complex waveform?

Answer 4

Range ambiguity due to the fact that sample box is larger and can pick up more flow from adjacent vessels

Question 5

A CW probe is insonation g at a angle of 45 degrees while a PW probe insonates the vessel at 60 degrees. Which one has the greater chance at overcoming aliasing?

Answer 5

CW

Question 6

What artifact must be accounted for when operating in a high mode to evaluate high velocity RBCs?

Answer 6

Range ambiguity

Question 7

A single vessel is sampled with the spectral display showing beats of 2, 4, then 6 as the sweep speed is adjusted. Which of the following demonstrates the respective adjustment of the sweep speed?

1. Slow to medium to fast
2. Fast to medium to slow
3. Medium to fast to slow
4. Fast to slow to medium

Answer 7

Fast to medium to slow

Question 8

A saturation map is easier to interpret the qualitative velocity data represented in a colour doppler image? T/F?

Answer 8

False

Question 9

Magnitude is to saturation as amplitude is to what?

Answer 9

Luminance