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Physics > Kahoot - All Post Midterm > Flashcards

Kahoot - All Post Midterm Flashcards

1
Q

The reflected frequency is higher than the transmitted frequency when there is a positive shift or

A

Source and receiver are moving towards each other

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2
Q

Doppler angle is between

A

Flow direction and sound beam

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3
Q

What is related to Doppler shift

A

Cosine angle between flow and sound beam
Velocity of RBC
Fundamental frequency

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4
Q

True or false

The larger the Doppler angle the larger the Doppler shift

A

False

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5
Q

True or false

The larger the operating frequency the larger the Doppler shift

A

True

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6
Q

True or false

The lower the operating frequency used the faster the calculated velocity

A

False

Check formula relationship

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7
Q

True or false

Incorporating angle with non-zero interrogations always brings the speed up

A

True

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8
Q

Speed of blood

A

10-100 cm/s

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9
Q

Doppler angle best range

A

30-60

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10
Q

Operating frequency range in MHz

A

2-10 MHz

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11
Q

Doppler shift range

A

100 Hz to 11 KHz

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12
Q

True or false

You can hear the Doppler shift

A

True

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13
Q

Number of cycles in a pulse in Doppler u/s

A

5-30

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14
Q

Without angle correct Fd= 16 KHz, what is the shift if you use angle correct at 60 degrees?

A

8 kHz

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15
Q

Why scanning at Doppler angle more than 60 degrees not a good idea?

A

Increases chance of error in velocity

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16
Q

Which is a digital processing technique used to process colour Doppler

A

Autocorrelation

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17
Q

Which one has the higher duty factor? Pulse US or CW Doppler ?

A

CW (no listening time)

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18
Q

No colour in vessel most likely due to

A

No Doppler shift

Doppler angle 90 degrees

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19
Q

PD in Doppler is higher than in B mode, which means typically period (T) in Doppler pulse is higher than in b mode
True or false

A

False

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20
Q

Power Doppler shows blood flow ____

A

Presence

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21
Q

Ensemble length for Doppler u/s

A

3-32

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22
Q

Large ensemble length leads to (3). What does it not do

A
  • better accuracy of Doppler shifts
  • degradation of temporal resolution
  • better sensitivity/detecting echoes
    DOES NOT increase imaging depth
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23
Q

To show faster speeds you need to ______

A

Increase PRF

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24
Q

If your PRF is 10 KHz which Doppler shift will create aliasing

A

1/2 PRF so anything above 5 KHz

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25
``` Which of these parameters you can’t control in Doppler: Wall filter PRF Nyquist limit Baseline ```
Nyquist limit
26
This control sets up a cut off amplitude limit below which echoes will show in colour
Priority
27
Which control will eliminate clutter?
Wall filter
28
What type of blood flow demonstrates straight layers of fluid sliding over each other
Laminar
29
Resistance to flow offered by a fluid in motion describes
Viscosity
30
Driving force behind blood flow
Pressure difference
31
A nonsteady flow with acceleration and deceleration over the cardiac cycle is ______ flow
Pulsatile
32
____ describes volumetric flow rate as a constant
Continuity rule Volumetric flow rate must be constant for the three regions : prox, at and distal to stenosis because blood is neither created or destroyed
33
Volumetric flow rate for a short segment
Q=V*A
34
Besides liquids which matter is considered a fluid
Gases
35
Turbulent flow is a form of ____ flow
Non-laminar
36
The state of downstream arterioles is reflected in the ____
Arteriole diastolic flow
37
The Doppler equation relates the Doppler shift to the _____
Flow speed and frequency
38
The decreases pressure in regions of high flow speed is called __\\\
Bernoulli effect
39
For a given flow, the greater the Doppler angle, the
Smaller the shift
40
Sound reflects totally at the wall-blood boundary once the Doppler angle is less than
30 degrees
41
What is required for flow to occur?
Pressure diff
42
``` Doppler shift does not depend on the : Speed? Direction? Operating frequency? Doppler angle? ``` Choose one
Flow direction
43
The resistance of the _____ accounts for about one half of the total resistance in the systemic circulation
Arterioles
44
The max normal flow speed in the circulation is ____ cm/s
100 cm/s
45
Variance colour maps demonstrate a change of hues from
Left to right
46
Which of the following Doppler techniques must be time shared?
Duplex imaging
47
Which system control eliminates high-intensity low-frequency Doppler shifts
Wall filter
48
The width of the sample volume is determined by the ____
Beam width
49
What advantage does spectral analysis have when compared to other Doppler techniques
Displays peak systolic velocities
50
The angle of incidence is not important with which Doppler display?
Power
51
Vertical thickening of the spectral tracing is called
Spectral broadening
52
Which type of bf demonstrates a chaotic flow pattern
Turbulent
53
Which type of blood flow would demonstrate the narrowest range of Doppler shift frequencies
Plug | Because velocity is the same across all blood flow
54
FF Transform
Determines Doppler spectrum
55
Can show slow flows in deep or small vessels
Power Doppler
56
The horizontal presentation in spectral display represents
Time
57
The vertical axis in spectral display represents
Doppler shift | Velocity
58
Spectral broadening may be produced by
Beam spreading in arrays
59
Continuous wave Doppler shifts are detected within the
Overlap area of transmitted and received beams
60
Motion towards the TD demonstrates
Flow above baseline | Positive Doppler shift
61
Advantage of pulsed Doppler
Depth of sample volume can be accurately selected
62
Echoes arrive from sample volume depth at a rate equal to
PRF
63
Poiseuille’s equation states that if the flow rate increases the
Tube diameter has increased
64
True or false | The maximum detectable blood flow speed with pulsed Doppler imaging is determined by aliasing
True
65
True or false | The Doppler shift is directly related to volumetric flow rate
False
66
True or false | Multiple foci are used in colour Doppler imaging
False Also colour Doppler does NOT utilize high frame rates

Physics (9 decks)

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