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Vascular Board > Chapter 4 Doppler Waveform Analysis > Flashcards

Chapter 4 Doppler Waveform Analysis Flashcards

1
Q

When a wave is reflected from a moving target the frequency of the wave received is different from the transmitted wave describes

A

The Doppler effect

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2
Q

What effect occurs with relative motion between the source and the receiver of the sound

A

Doppler effect

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3
Q

What type of Doppler velocimetry employs a zero crossing frequency meter to display the signals graphically and a strip chart recorder

A

Analog

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4
Q

During spectral analysis individual frequencies are displayed by using what method

A

Fast Fourier method (FFT)

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5
Q

During spectral analysis time is displayed on what axis

A

Horizontal or X

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6
Q

During spectral analysis frequency shifts are displayed on what axis

A

Vertical axis or Y

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7
Q

During a Doppler waveform analysis what frequency probe is utilized

A

8-10 MHz

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8
Q

A monophasic/dampened signal is often obtained ________ to an obstruction

A

Proximal

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9
Q

Vasodilation of the ______ vessels often occur with proximal obstruction reducing the pulsatility

A

Distal

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10
Q

What type of flow does the subclavian artery have

A

High resistant multiphasic flow

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11
Q

Absent Doppler signals may suggest occlusion or a pre-occlusive vessel that is called what

A

String sign

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12
Q

How do you calculate the pulsatility index

A

Divide the peak to peak frequency difference (P1-P2) by the mean average frequency

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13
Q

This helps to differentiate inflow (aorto-iliac) disease from out flow (s-femoral) disease

A

Acceleration time

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14
Q

An angle of insonation of ______ to the ski n surface is usually appropriate for this study

A

45-60 degrees

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15
Q

The advantage of spectral analysis is that it shows the ________ at all _________

A

Amplitude at all frequencies

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16
Q

Spectral analysis is ______ sensitive to displaying multiple frequencies

A

More

17
Q

The upper and lower extremity arteries have ________ resistance flow patterns

A

Higher

18
Q

The _______ sign is a pre occlusive lesion that may still have very slow velocities moving through it

A

String

19
Q

Arterial vasodilation is ______ resistance

A

Low

20
Q

What upper extremity artery is characterized by multi phasic high resistance flow

A

Subclavian artery

21
Q

A normal pulsatility index for the CFA is

A

Greater than 5.5

22
Q

A normal pulsatility index for the popliteal artery is

A

8.0

23
Q

_______ ________ factor is the ratio of the distal pulsatility index of the proximal pulsatility index of an arterial segment

A

Inverse damping

24
Q

An acceleration time of > 133 msec suggests the presence of significant ______ disease

A

Iliac

25
Q

_______ _______ helps to differentiate inflow from our flow disease

A

Acceleration time

Vascular Board (29 decks)

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