Optimizing color doppler - Ch 19

Question 1

how do you create color in a normal vessel where none appears? give multiple options

Answer 1

1. steer color box away from 90 degrees first
2. increase color doppler gain or decrease scale or reduce wall filter

Question 2

how do you reduce “confetti”?

Answer 2

decrease doppler gain or increase scale

Question 3

what can happen with spectral doppler gain that is too high?

Answer 3

can cause laminar flow to appear as spectral broadening

Question 4

how to reduce rainbow? what is this?

Answer 4

rainbow = aliasing; to fix increase scale

Question 5

what to do when you only see the top half of a vessel?

Answer 5

image deeper

Question 6

what if you wish to see more color doppler in a horizontal vessel? does doing this change anything else?

Answer 6

make color box wider; this decreases frame rate but image quality does not change

Question 7

what kind of transducer is used when imaging superficial structures? why is this?

Answer 7

linear or expanded view transducer rather than sector; sector is less effective when imaging superficial structures

Question 8

what if color extends outside vessel lumen or color is placed on moving tissues?

Answer 8

increase wall filter or increase scale