Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

SPI Click to Learn > Doppler Click to Learn Part 2 > Flashcards

Doppler Click to Learn Part 2 Flashcards

1
Q

Which component of the duplex ultrasound system processes the doppler shift information to provide the doppler waveform

A. FFT
B. demodulator
C. quadrature phase detector and FFT
D. quadrature phase detector

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which of the following persistence levels should be used to optimize color doppler imaging of cardiac structures

A. varies with the velocity of the blood flow
B. medium
C. high
D. low

A

D, low color persistence should be used for moving structures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which of the following correctly describes CW doppler

A. a spectral window is never displayed on a CW doppler tracing
B. positive velocities displayed with CW doppler always indicate flow moving away from the transducer
C. negative velocities displayed with CW doppler always indicate flow moving toward the transducer
D. CW doppler transducers have a wide bandwidth

A

A, there is no spectral window with CW doppler

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which of the following image controls can be adjusted to produce a smoother color doppler image

A. persistence
B. color baseline
C. priority
D. gain compensation

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

If the reflector is moving toward the sound source, the resulting reflected wave will exhibit

A. an unchanged frequency
B. a lower frequency
C. a higher frequency

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

If the reflector is moving away from the stationary sound source, the reflected wave will

A. unable to determine without more information
B. have a higher frequency than the transmitted frequency
C. not be detected
D. have a lower frequency than the transmitted frequency

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which of the following are disadvantages of power doppler

A. slow frame rates and flash artifact
B. aliasing and flash artifact
C. increased risk of bioeffects and aliasing
D. twinkle artifact and limited color maps

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

______ uses the amplitude of the doppler shift and the intensity of the red blood cells to be able to generate color on the image independent of the angle of insonation

A. color doppler
B. PW doppler
C. power doppler
D. CW doppler

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

In a pulsed wave system, how often the blood flow is sampled is determined by the ______

A. pulse duration
B. SPL
C. nyquist limit
D. PRF

A

D, as the PRF increases, the pulses are emitted at a faster rate which leads to faster sampling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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. decrease doppler scale
B. decrease transducer frequency
C. change the cursor angle to 0 degrees
D. reverse the color display baseline

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

If you change from 4MHz to 2 MHz transducer frequency what happens to the detected doppler shift

A. it will quadruple
B. it will decrease by 50%
C. it will decrease by 25%
D. it will double

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

If there is no diastolic flow demonstrated on a doppler tracing of the arcuate artery of the upper pole of the right kidney, what will the resistive index be

A. unable to calculate the RI, not enough information given
B. 1.0
C. 0
D. 0.5

A

B, the resistive index is calculated using the peak and end diastolic velocities measured on a doppler tracing, PSV-EDV/PSV, Example: PSV 50cm/s. EDV 0cm/s: 50-0/50-1.0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Autocorrelation calculates the _____ of flow for color doppler flow display

A. resistive index
B. doppler shift
C. mean velocity
D. peak velocity

A

C, color doppler does mean velocity while PW does peak velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Increasing the ______ will aid in the ability to properly trace the contour of the doppler waveform

A. sweep speed
B. baseline
C. wall filter
D. velocity scale

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The doppler tracing of the flow in a vessel 1cm distal to a stenosis will demonstrate _____ than at the stenosis

A. greater resistance
B. more laminar flow
C. greater bandwidth
D. greater doppler shift

A

C, flow distal to a stenosis will demonstrate a reduced doppler shift (velocity), low resistance, turbulent waveform, greater bandwidth will display as spectral broadening with turbulent flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The doppler tracing demonstrates electrical noise. How can you reduce or eliminate the artifact

A. increase the wall filter settings
B. extend the cord to move the machine as far from the electrical outlet as possible
C. decrease the wall filter settings
D. decrease the PRF

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What doppler artifact in unwanted reflected information from locations other than the desired sample location

A. twinkle artifact
B. mirror image
C. spectral broadening
D. range ambiguity

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

During inspiration the flow in the veins of the upper extremities _______

A. increases
B. decreases
C. remains unchanged

A

A, during inspiration the pressure within the chest cavity decreases allowing venous flow from the upper extremities to increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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. change the cursor angle to 0 degrees
C. decrease doppler scale
D. decrease transducer frequency

A

C

20
Q

If the reflector is moving away from the stationary sound source, the reflected wave will

A. have a lower frequency than the transmitted frequency
B. not be detected
C. unable to determine without more information
D. have a higher frequency than the transmitted frequency

A

A, if the blood is moving away from the transducer, the reflected sound has a lower frequency

21
Q

What is the term used for unwanted doppler display patterns typically caused by structure motion or breathing

A. clutter
B. mirror imaging
C. blooming
D. twinkle

A

A

22
Q

All of the following can be related to color flash artifact, except

A. decreased color filter
B. decreased color scale
C. increased color priority
D. decreased color gain

A

D

23
Q

Blooming artifact occurs

A. when color obscures the gray scale display of soft plaque because the resolution of color doppler is lower than the gray scale
B. as a vertical stripe of mosaic color pattern seen posterior to highly reflective objects
C. unwanted doppler display patterns typically caused by structure motion or breathing
D. as a second copy of the doppler tracing displayed on the opposite side of the baseline

A

A

24
Q

________ compares each reflected echo to the same echo from a previous US pulse to determine if motion is present

A. registration accuracy
B. autocorrelation
C. quadrature detector
D. temporal resolution

A

B

25
Q

Resistance to blood flow is primarily controlled by

A. force of cardiac contraction
B. the length of the vessel
C. the volume of blood in the vessel
D. the radius of the vessel

A

D

26
Q

Which of the following should be increased when evaluating venous flow on doppler

A. wall filter
B. PRF
C. output power
D. color priority

A

D

27
Q

Increasing the transducer frequency will reduce the appearance of _______, while increasing the appearance of _______ on doppler evaluation

A. clutter, ghosting
B. range ambiguity, aliasing
C. aliasing, range ambiguity
D. aliasing, blooming

A

B

28
Q

If a PW doppler system is operating at a PRF of 5000/s what is the maximum doppler frequency shift that can be detected without aliasing

A. 2500kHz
B. 5000kHz
C. 2.5kHz
D. 5kHz

A

C, nyquist limit= 1/2 PRF

29
Q

In a pulsed wave system, how often the blood flow is sampled is determined by the ________

A. PRF
B. SPL
C. pulse duration
D. nyquist limit

A

A

30
Q

As the cosine of the cursor angle increases

A. the propagation velocity increases
B. the calculated velocity decreases
C. the calculated velocity increases
D. the propagation velocity decreases

A

B

31
Q

Increasing the transducer frequency will reduce the appearance of ______, while increasing the appearance of _______ on doppler evaluation

A. clutter, ghosting
B. range ambiguity, aliasing
C. aliasing, blooming
D. aliasing, range ambiguity

A

B

32
Q

What is the term used for unwanted doppler display patterns typically caused by structure motion or breathing

A. clutter
B. twinkle
C. mirror imaging
D. blooming

A

A

33
Q

Blooming artifact occurs

A. as a second copy of the doppler tracing displayed on the opposite side of the baseline
B. when color obscures the gray scale display of soft plaque because the resolution of color doppler is lower than the gray scale
C. as vertical stripe of mosaic color pattern seen posterior to highly reflective objects
D. unwanted doppler display patterns typically caused by structure motion or breathing

A

B

34
Q

As the cosine of the cursor angle increases

A. the calculated velocity decreases
B. the prop velocity increases
C. the prop velocity decreases
D. the calculated velocity increases

A

A

35
Q

Resistance to blood flow is primarily controlled by

A. the volume of blood in the vessel
B. the length of the vessel
C. the radius of the vessel
D. force of the cardiac contraction

A

C

36
Q

If the stenosis/blockage reduces the vessel lumen to 1/4 of the normal vessel area, the velocity of flow at the stenosis must ______ to maintain the flow rate

A. quadruple
B. increase by 400%
C. double
D. decrease by 25%

A

A

37
Q

If blood pressure increased with no change in resistance, what happens

A. decreased flow rate
B. increased viscosity of flow
C. increased flow rate
D. decreased flow volume

A

C

38
Q

What imaging technique has the worst temporal resolution

A. 2D imaging
B. color doppler
C. PW doppler
D. M mode

A

B

39
Q

If you are using a transducer with a 100 microsecond PRP, a doppler shift greater than ______ will lead to aliasing on the display

A. 5kHz
B. 15kHz
C. 10kHz
D. 25kHz

A

A

40
Q

All of the following can be related to color flash except

A. decreased color scale
B. decreased color filter
C. increased color priority
D. decreased color gain

A

D

41
Q

Which of the following should be increased when evaluating venous flow on doppler

A. color priority
B. PRF
C. output power
D. wall filter

A

A

42
Q

Resistance to blood flow is primarily controlled by

A. the length of the vessel
B. the volume of blood in the vessel
C. force of the cardiac contraction
D. the radius of the vessel

A

D

43
Q

If a PW doppler system is operating at a PRF of 5000/s what is the maximum doppler frequency shift that can be detected without aliasing

A. 2500kHz
B. 5000kHz
C. 2.5kHz
D. 5kHz

A

C

44
Q

Increasing the PRF will reduce the appearance of ______, while increasing the appearance of ______ on doppler evaluation

A. range ambiguity, aliasing
B. aliasing, blooming
C. aliasing, range ambiguity
D. clutter, ghosting

A

C

45
Q

What imaging technique has the worst temporal resolution

A. PW doppler
B. M mode
C. color doppler
D. 2D imaging

A

C

46
Q

Which of the following will increase the risk of aliasing

A. intercept angle of 90 degrees
B. low velocity blood flow
C. decreasing the image depth
D. increasing transmit frequency

A

D

SPI Click to Learn (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions