Doppler Instrumentation and Hemodynamics Review Questions with complete Solutions Graded A+
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Course
Hemodynamics
Institution
Hemodynamics
Doppler Instrumentation and Hemodynamics Review Questions with complete Solutions Graded A+
Which answer provides the best explanation for the reason that the frame rate decreases when color Doppler is activated?
A: The color Doppler pulse length is longer
B: There are more focal zones when col...
Doppler Instrumentation and Hemodynamics Review Questions with complete Solutions Graded A+
Which answer provides the best explanation for the reason that the frame rate decreases when color
Doppler is activated?
A: The color Doppler pulse length is longer
B: There are more focal zones when color is active
C: The system memory resources are challenged
D: More pulses are fired on each line of sight
E: All of the above - Answers D
Color Doppler requires from 4 to 32 pulses for each scan line. B-mode requires only 1 pulse for each
focal zone on each scan line
The layer of the vessels wall that contains smooth muscle fibers is:
A) adventitia
B) media
C) intima
D) internal elastic lamina
E) external elastic lamina - Answers B
Atherosclerosis begins within:
A) the adventitia
B) the media
C) the intima
D) both A and B
E) all of the above - Answers C
,atherosclerotic disease begins as a fatty streak within the intimal layer of the vessel wall
According to Poiseullie's equation, what will happen to flow if pressure difference increases?
A) flow rate will increase
B) flow will stagnate
C) flow will become pulsatile
D) flow velocity will decrease
E) flow will become turbulent - Answers A
the greater the pressure difference between two points, the greater the flow point
Parabolic flow is most likely to occur with:
A: Distal to a stenosis
B: Small veins
C: Laminar flow states
D: Disturbed flow states
E: When aliasing is present - Answers C
this is because the flow speed varies across the width of the vessel, with the fastest flow in the center
and flow becoming progressively slower toward the vessel wall
Which condition is most likely to occur in patients having a normal arterial waveform shape, but low
velocities across all vessels?
A) hypertension
B) low cardiac output
C) low hematrocrit
D) venomotor tone
,E) arterial waveform shape and velocity are unrelated - Answers B
What does the Doppler signal spectral display depict?
A) relative signal power at each frequency in the Doppler signal
B) depth to each vessel
C) volume flow rate
D) transmit frequency
E) acoustic power - Answers A
the Doppler signal spectral display depicts the frequency bandwidth and range of amplitudes in the
reflected signal. The amplitude or signal power depends on the relative number of red blood cells
comprising each component of the frequency-shift spectrum
What method is most commonly used to perform spectral analysis for pulsed Doppler?
A) zero-crossing detection
B) fourier analysis
C) reynolds number
D) cross correlation
E) autocorrelation - Answers B
What aspect of the Doppler spectrum is color-encoded with color Doppler?
A: Amplitude
B: Frequency shift
C: Power
D: Velocity
E: Bandwidth - Answers B
, method of displaying the average Doppler frequency shift
Your patient has edema involving the right lower extremity. This may be caused by:
A) increased intravenous pressure
B) decreased venous hypertension
C) decreased venous hypervolemia
D) increased venous hypovlemia
E) increased extravascular pressure - Answers A
The most numerous cells in the blood are the:
A) Erythrocytes
B) Leukocytes
C) Platelets
D) Plasma
E) Lymphocytes - Answers A
Which of the following statements about turbulent flow is NOT true?
A) it can be predicted by the Reynolds number
B) it is responsible for murmurs, bruits, and thrills
C) it causes increase in pressure downstream
D) it occurs where there are abrupt variations in vessel diameter
E) it is affected by velocity - Answers C
pressure is reduced distal to a stenosis in turbulent flow
During Doppler interrogation of the carotid artery, you detect spectral mirroring. Which of the following
is a common cause of this artifact?
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