Wall filter

Question 1

What are the two types of wall filters?

Answer 1

low pass filter and high pass filter

Question 2

what is the job of low-pass filter?

Answer 2

it eliminates higher frequencies above a certain threshold allowing lower frequencies to pass

Question 3

what is the job of high pass filter?

Answer 3

eliminates low frequency doppler shifts of slow moving RBCs traveling close to vessel walls

Question 4

what do you do when your spectral window is filled?

Answer 4

decrease your gain

Question 5

how do you fix ghosting, or clutter artifact?

Answer 5

increase wall filter, or decrease color gain
(if both are presented on SPI , choose color gain first!)

Question 6

if you are looking at two vessels and one has color but color is missing in the other what will you do to show flow in both vessels?

Answer 6

increase color gain

Question 7

if you have an image and there is too much color showing in both vessels how do you fix it?

Answer 7

increase scale

Question 8

What Doppler use wall filter?

Answer 8

Spectral and color Doppler