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20 Cards in this Set
- Front
- Back
The following quantitative measurements can be made using an arterial Doppler spectral waveform?
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Peak systolic velocity
Resistive Index End diastolic Velocity |
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The electraonic device that breaks down a Doppler signal into its basic frequency components is a:
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Spectrum analyzer (FFT)
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The reduction in intensity and amplitude of a sound beam as it passes through a medium is called:
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Attenuation
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Which of the hemodynamic parameters are directly observable using Doppler technology?
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Presence of flow
Flow velocity Flow directon |
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The units used to measure ultraound intensity are:
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mWatts/cm2
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All of the following characteristics of blood affects its flow:
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Viscosity
Volume Red blood cell content |
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Which Doppler technique must be used to obtain quantitative information of blood fow velocity?
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Pulse Doppler
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The Doppler shift is defined as the:
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Difference between transmitted frequency and the receiveved frequency
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As frequency increases in a sound wave; wavelength:
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Decreases
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Acoustic impedance is defined as:
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Product of velocity and density
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Which factors will affect the intensity of the Doppler shift?
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Quanity of scatters present in fluid.
Frequency of transmitted sound. Difference in acoustic impedande. |
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The Dopppler effect is best characterized as a chante in:
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Frequency
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An ultrasound transducer receives an echo whose frequency is 0.25MHz greater than the frequency emitted. The imaging system will display this information:
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Above the baseline on the frequency spectrum
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On a Doppler spectral display, which paraneter is displayed on the X (horizontal) axis?
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Amplutude
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The characteristics of a medium that determine propagation speed of ultrasound through it are:
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Density
Compressibility |
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The number of wavelenghts passing a given point in a single second is called:
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Frequency
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A structure that has a varied-texture throughout may be described sonographically as:
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Heterogenous
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The tendency of a body to stay at rest unless acted upon by a force is the definition of:
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Inertia
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In a spectral waveform displaying arterial flow, the horizontal (x) axis represents:
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The cardiac cycle
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A very light, lowly saturated color displayed in the center portion of a artery using color Doppler imaging represents:
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Relatively low velocity flow
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