Mock Exam Wrong Answers

Question 1

What resolves aliasing

Answer 1

Recall aliasing is when the Doppler shift is no more than the nyquist limit which is 1/2 PRF

decreasing the depth of the sample volume (answer) because it increases PRF (increasing nyquist limit)

Question 2

Do you increase or decrease operator frequency to resolve aliasing

Answer 2

Decrease operator frequency (which would decrease Doppler shift)

You want to decrease Doppler shift OR
increase PRF
Because a Doppler shift if anything over 1/2 PRF will alias

Question 3

The greatest portion of circulating blood is located in the

Answer 3

Venous system

Question 4

True or false

Size of the sample volume is determined by ensemble length

Answer 4

number of pulses per scan line does not change window size

Question 5

Spatial pulse length

Answer 5

Number of cycles in a pulse

Question 6

The greater the impedance difference the greater the

Answer 6

Reflection

NOT refraction

Question 7

Refraction requires two things to happen

Answer 7

Different propagation speeds
Oblique incidence (not perpendicular)