SPI REVIEW QUESTIONS: Doppler
Which of the following adjustments will improve temporal resolution on color Doppler?
A. steer the sample box
B. increase the wall filter
C. decrease sample size
D. increase color gain - ✔️✔️C. decrease the sample size
While using the same type of ultrasound system, a 5MHz continuous wave and 5MHz
pulsed wave transducer are used at the same time to evaluate blood flow in the same
artery. Which transducer will produce a display of the spectral tracing first?
A. continuous wave
B. pulsed wave
C. depends on the depth of the artery
D. they will both produce the waveform at the same time - ✔️✔️D. they will both
produce the waveform at the same time
Which of the following parameters is displayed on the y-axis on a Doppler tracing?
A. speed
B. time
C. frequency shift
D. motion - ✔️✔️C. frequency shift
Which of the following is a system adjustment that is made when changing from a lower
extremity arterial exam to a lower extremity venous exam on the same patient?
A. reverse the color display baseline
B. decrease transducer frequency
C. decrease Doppler scale
D. change the cursor angle to 0 degrees - ✔️✔️C. decrease doppler scale
The primary advantage of continuous wave Doppler is:
A. Image depth
B. Range discrimination
C. Absence of the Nyquist limit
D. Reduced aliasing - ✔️✔️C. Absence of the nyquist limit
,Blood is flowing toward a 7MHz transducer; you expect the reflected frequency to be
_______ 7MHz.
A. greater than
B. less than
C. constant at
D. one half of - ✔️✔️A. greater than
What is the average Nyquist limit for a 5MHz CW Doppler probe?
A. 15kHz
B. 10kHz
C. 7kHz
D. None of the above - ✔️✔️D. none of the above
-continous wave doppler is not limited by PRF or the nyquist limit.
The best angle of insonation to produce the most accurate Doppler shift information
is_________degrees.
A. 0
B. 45
C. 60
D. 90 - ✔️✔️A. 0
The term __________________ refers to when all layers of blood flow are moving at
relatively the same speed.
A. Laminar flow
B. Reynolds flow
C. Eddy currents
D. Plug flow - ✔️✔️D. Plug flow
What is laminar flow? - ✔️✔️blood flow layers moving at slightly different speeds with
the highest velocity in the center
What is the method used to estimate the ankle blood pressure in a standing patient?
A. Add 100mmHg to the systolic blood pressure
B. Systolic blood pressure x 2
C. Add 100mmHg to the diastolic blood pressure
D. Diastolic blood pressure x 2 - ✔️✔️A. add 100mmHg to the systolic blood pressure
. A Reynold's number greater than ______________ indicates turbulent flow on
___________ evaluation.
, A. 2000, color Doppler
B. 500, color Doppler
C. 500, PW Doppler
D. 2000, PW Doppler - ✔️✔️A 2000, color Doppler
. __________________ is the term used to describe the concentric layers of blood flow
within a normal vessel.
A. turbulence
B. laminar flow
C. plug flow
D. Doppler shift - ✔️✔️B. laminar flow
If the peak pressure gradient in a vessel is 36mmHg, what is the velocity of the flow?
A. 1 cm/s
B. 3 m/s
C. 2 cm/s
D. 4 cm/s - ✔️✔️B. 3 m/s
benouli equation - ✔️✔️PPG=4xvelocity2
to figure out velocity
vel=ppg/4 what is the square root of the answer?
. What is the cosine of 60 degrees?
A. 0
B. 0.5
C. 0.7575
D. 1 - ✔️✔️B. 0.5
18. All of the following correctly describe a CW Doppler evaluation, except?
A. CW Doppler is most useful with high velocity flow.
B. CW Doppler tracings will not demonstrate a spectral window.
C. CW Doppler transducers contain at least two elements, one that transmits sound and
one that receives the reflections.
D. The angle of incidence does not affect the velocity evaluation using CW Doppler
because you are not evaluating the vessel at a specific depth. - ✔️✔️D. The angle of
incidence does not affect the velocity evaluation using CW Doppler because you are not
evaluating the vessel at a specific depth.
Which of the following adjustments will improve temporal resolution on color Doppler?
A. steer the sample box
B. increase the wall filter
C. decrease sample size
D. increase color gain - ✔️✔️C. decrease the sample size
While using the same type of ultrasound system, a 5MHz continuous wave and 5MHz
pulsed wave transducer are used at the same time to evaluate blood flow in the same
artery. Which transducer will produce a display of the spectral tracing first?
A. continuous wave
B. pulsed wave
C. depends on the depth of the artery
D. they will both produce the waveform at the same time - ✔️✔️D. they will both
produce the waveform at the same time
Which of the following parameters is displayed on the y-axis on a Doppler tracing?
A. speed
B. time
C. frequency shift
D. motion - ✔️✔️C. frequency shift
Which of the following is a system adjustment that is made when changing from a lower
extremity arterial exam to a lower extremity venous exam on the same patient?
A. reverse the color display baseline
B. decrease transducer frequency
C. decrease Doppler scale
D. change the cursor angle to 0 degrees - ✔️✔️C. decrease doppler scale
The primary advantage of continuous wave Doppler is:
A. Image depth
B. Range discrimination
C. Absence of the Nyquist limit
D. Reduced aliasing - ✔️✔️C. Absence of the nyquist limit
,Blood is flowing toward a 7MHz transducer; you expect the reflected frequency to be
_______ 7MHz.
A. greater than
B. less than
C. constant at
D. one half of - ✔️✔️A. greater than
What is the average Nyquist limit for a 5MHz CW Doppler probe?
A. 15kHz
B. 10kHz
C. 7kHz
D. None of the above - ✔️✔️D. none of the above
-continous wave doppler is not limited by PRF or the nyquist limit.
The best angle of insonation to produce the most accurate Doppler shift information
is_________degrees.
A. 0
B. 45
C. 60
D. 90 - ✔️✔️A. 0
The term __________________ refers to when all layers of blood flow are moving at
relatively the same speed.
A. Laminar flow
B. Reynolds flow
C. Eddy currents
D. Plug flow - ✔️✔️D. Plug flow
What is laminar flow? - ✔️✔️blood flow layers moving at slightly different speeds with
the highest velocity in the center
What is the method used to estimate the ankle blood pressure in a standing patient?
A. Add 100mmHg to the systolic blood pressure
B. Systolic blood pressure x 2
C. Add 100mmHg to the diastolic blood pressure
D. Diastolic blood pressure x 2 - ✔️✔️A. add 100mmHg to the systolic blood pressure
. A Reynold's number greater than ______________ indicates turbulent flow on
___________ evaluation.
, A. 2000, color Doppler
B. 500, color Doppler
C. 500, PW Doppler
D. 2000, PW Doppler - ✔️✔️A 2000, color Doppler
. __________________ is the term used to describe the concentric layers of blood flow
within a normal vessel.
A. turbulence
B. laminar flow
C. plug flow
D. Doppler shift - ✔️✔️B. laminar flow
If the peak pressure gradient in a vessel is 36mmHg, what is the velocity of the flow?
A. 1 cm/s
B. 3 m/s
C. 2 cm/s
D. 4 cm/s - ✔️✔️B. 3 m/s
benouli equation - ✔️✔️PPG=4xvelocity2
to figure out velocity
vel=ppg/4 what is the square root of the answer?
. What is the cosine of 60 degrees?
A. 0
B. 0.5
C. 0.7575
D. 1 - ✔️✔️B. 0.5
18. All of the following correctly describe a CW Doppler evaluation, except?
A. CW Doppler is most useful with high velocity flow.
B. CW Doppler tracings will not demonstrate a spectral window.
C. CW Doppler transducers contain at least two elements, one that transmits sound and
one that receives the reflections.
D. The angle of incidence does not affect the velocity evaluation using CW Doppler
because you are not evaluating the vessel at a specific depth. - ✔️✔️D. The angle of
incidence does not affect the velocity evaluation using CW Doppler because you are not
evaluating the vessel at a specific depth.
