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