Carotid Color Duplex (Ch. 2 Pt.2)

Question 1

Maintain a spectral Doppler angle as close to ___ degrees as possible.

Answer 1

60 degrees

Question 2

You should never go _______ 60 degrees.

Answer 2

above

Question 3

Over angle correction=

Answer 3

overestimation of velocities

Question 4

Under angle correction =

Answer 4

underestimation of velocities

Question 5

Angle correct to the _______ vessel wall.

Answer 5

posterior

Question 6

Most accurate frequency shifts, or calculated velocities, are obtained at what?

Answer 6

0 degrees

Question 7

A 0 degree Doppler incidence is always assumed for _______ and _______ Doppler applications.

Answer 7

cardiac, transcranial Doppler applications

Question 8

Doppler Frequency shift is caused by

Answer 8

motion

Question 9

Doppler Frequency shift is equal to

Answer 9

the received Frequency minus the source frequency

Question 10

Which is better: over correction or under correction?

Answer 10

Undercorrection

Question 11

NAME THE FOUR STEPS TO MAPPING A STENOSIS:

Answer 11

1. VISUALIZE PLAQUE
2. WORK THE DOPPLER SAMPLE VOLUME THROUGH THE STENOTIC REGION (THINK 3 DIMENSIONS)
3. RECORD AND MEASURE HIGHEST VELOCITY (TAKE 2 OR 3 SAMPLES)
4. SAMPLE AND RECORD DISTAL TO STENOSIS TO DETECT TURBULENCE IF ANY

Question 12

Trickle flow in a nearly occluded vessel (ex. ICA) may not be detected with color Doppler if

Answer 12

The velocity scale (PRF) is set too high. So if you cant see color flow, try lowering the PRF

Question 13

Often, a very low-flow situation can occur due to the _____ ______ of the residual lumen diameter and length.

Answer 13

high resistance