SPI REVIEW QUESTIONS: Doppler Questions and Verified
Answers || Graded A+ | 2025|2026 EXAM UPDATE
According to the Bernoulli Principle, where will you find the lowest pressure in a vessel with
stenosis?
A. proximal to the stenosis
B. distal to the stenosis
C. in the collateral vessels
D. at the site of stenosis - D. at the site of stenosis
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
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
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
Answers || Graded A+ | 2025|2026 EXAM UPDATE
According to the Bernoulli Principle, where will you find the lowest pressure in a vessel with
stenosis?
A. proximal to the stenosis
B. distal to the stenosis
C. in the collateral vessels
D. at the site of stenosis - D. at the site of stenosis
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
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
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
