Ch 20 Optimizing Color Doppler

no doppler shift will be created with ______ incidence; so no color will show up in a vessel

normal (90 degrees)

color will never appear in a vessel when the directions of sound and flow are

perpendicular

for color to appear in the vessel, an angle other than ______ must be created between the direction of flow and the direction of the sound beam

90 degrees

when color appears throughout the color box, not just within the vessel it is called

color confetti

increasing color _____ will make color appear in the image

gain

when color gain is too ____, color may appear outside of the vessel

high

spectral doppler gain is used to alter

waveforms

_________ is present in a vessel when the colors red, black, and blue are next to each other

flow reversal

________ is present on the image when light blue and green are adjacent

aliasing

the most effective way to eliminate aliasing on a color flow image is to ________ the velocity scale

increase

increasing the color Doppler scale ________ sensitivity to slow flows

decreases

the use of a wall filter selectively eliminates ______ frequency Doppler shifts

low

wall filters _____ (do/do not) eliminate aliasing

do not