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QUIZ3
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QUIZ3

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Questions and Answers

Which technique is used to improve the signal to noise ratio on a color image?

  • Temporal resolution
  • Temporal compounding (correct)
  • Frame averaging
  • Persistence

    • What is another name for temporal compounding?

  • Temporal averaging
  • Frame averaging (correct)
  • Persistence
  • Temporal resolution

    • What does temporal compounding do to the amount of noise in an image?

  • Increases it
  • Removes it completely
  • Does not affect it
  • Decreases it (correct)

    • What does increased frame averaging lead to?

    <p>Decreased signal to noise ratio</p> Signup and view all the answers

    What cannot be used for rapidly moving structures?

    <p>Temporal resolution</p> Signup and view all the answers

    What is the purpose of frame averaging?

    <p>To decrease the amount of noise</p> Signup and view all the answers

    What is the main goal of persistence or temporal compounding?

    <p>To increase the signal to noise ratio</p> Signup and view all the answers

    Which technique is used to reduce temporal resolution?

    <p>Frame averaging</p> Signup and view all the answers

    Which angle between the cursor and the blood flow is considered optimum?

    <p>0 degrees</p> Signup and view all the answers

    What happens when the Doppler gain is set too high?

    <p>Flow velocities and pressure gradients are overestimated</p> Signup and view all the answers

    What happens when the Doppler gain is set too low?

    <p>Flow velocities and pressure gradients are underestimated</p> Signup and view all the answers

    What does the gain knob for color Doppler control?

    <p>The amount of color seen within the color box</p> Signup and view all the answers

    What happens when the color gain is overgained?

    <p>Color becomes very flashing and bleeds out of the intended area</p> Signup and view all the answers

    What happens when the color gain is undergained?

    <p>It makes it look like no flow is occurring</p> Signup and view all the answers

    What is the consequence of changing the cursor angle to an angle of incidence greater than 20 degrees off axis?

    <p>Flow velocity will be miscalculated</p> Signup and view all the answers

    What does the gain adjustment in spectral tracing do?

    <p>Adjusts the displayed amplitude of the reflected frequency shifts</p> Signup and view all the answers

    Which angle between the cursor and the blood flow is considered optimum?

    <p>0 degrees</p> Signup and view all the answers

    What is the consequence of changing the cursor angle to an angle of incidence greater than 20 degrees off axis?

    <p>Flow velocity will be miscalculated</p> Signup and view all the answers

    What does the gain adjustment in spectral tracing do?

    <p>Adjusts the displayed amplitude of the reflected frequency shifts</p> Signup and view all the answers

    What does the gain knob for color Doppler control?

    <p>The amount of color seen within the color box</p> Signup and view all the answers

    What happens when the Doppler gain is set too high?

    <p>The PSV measurement is over measured</p> Signup and view all the answers

    What happens when the Doppler gain is set too low?

    <p>The PSV measurement is under measured</p> Signup and view all the answers

    What happens when the color gain is overgained?

    <p>Color becomes very flashing and bleeds out of the intended area</p> Signup and view all the answers

    What happens when the color gain is undergained?

    <p>Color becomes very dim and hard to distinguish</p> Signup and view all the answers

    What is the purpose of frame averaging?

    <p>To improve the signal to noise ratio on a color image</p> Signup and view all the answers

    What does temporal compounding do to the amount of noise in an image?

    <p>Decreases it</p> Signup and view all the answers

    Which technique is used to reduce temporal resolution?

    <p>Frame averaging</p> Signup and view all the answers

    What is the consequence of changing the Doppler angle to an angle of incidence greater than 20 degrees off axis?

    <p>Increased spectral broadening</p> Signup and view all the answers

    What does Poiseuille's Equation describe?

    <p>The relationship between pressure, flow volume, and resistance</p> Signup and view all the answers

    What determines the rate of flow in the arteries and is regulated by the arterioles?

    <p>Resistance</p> Signup and view all the answers

    What happens when resistance increases in a blood vessel?

    <p>Pressure increases to maintain constant blood flow</p> Signup and view all the answers

    What causes the spectral window to fill in during turbulent flow?

    <p>Red blood cells flowing in multiple directions and speeds</p> Signup and view all the answers

    What causes overestimation of the peak velocity and diminishment of the spectral window in a Doppler tracing?

    <p>Artifacts associated with Doppler angle and imaging technique</p> Signup and view all the answers

    What happens to the size of the spectral window when the number of red blood cells sampled increases?

    <p>The size of the spectral window decreases</p> Signup and view all the answers

    What happens to the reflected frequencies when red blood cells are moving towards the transducer location?

    <p>They reflect back higher frequencies than what the transducer is producing</p> Signup and view all the answers

    How do you correct beam width artifact on a Doppler tracing?

    <p>Use a smaller sample size</p> Signup and view all the answers

    Which one of these statements about pressure is true?

    <p>Resistance and pressure change to maintain a constant volumetric flow rate</p> Signup and view all the answers

    Which one of these statements about volumetric flow rate is true?

    <p>Flow rate increases when resistance decreases without pressure changes</p> Signup and view all the answers

    Which one of these statements about the continuity rule is true?

    <p>Flow rate is the same proximal to a stenosis as it is distal to the stenosis</p> Signup and view all the answers

    Which one of these statements about pressure is true?

    <p>Pressure increases with systole</p> Signup and view all the answers

    Which one of these statements about volumetric flow rate is true?

    <p>Volumetric flow rate is always proportional to blood pressure</p> Signup and view all the answers

    What happens when resistance increases in a blood vessel?

    <p>Flow rate decreases without pressure changes</p> Signup and view all the answers

    Which one of these is true about the Doppler gain adjustment?

    <p>Over-gaining can cause overestimation of flow velocities and pressure gradients</p> Signup and view all the answers

    What is the consequence of changing the cursor angle to an angle of incidence greater than 20 degrees off axis?

    <p>Flow velocity will be miscalculated</p> Signup and view all the answers

    What does the gain knob for color Doppler control?

    <p>The amount of color seen within the color box</p> Signup and view all the answers

    Which technique is used to improve the signal to noise ratio on a color image?

    <p>Temporal compounding</p> Signup and view all the answers

    What determines the rate of flow in the arteries and is regulated by the arterioles?

    <p>Resistance</p> Signup and view all the answers

    What happens to the size of the spectral window when the number of red blood cells sampled increases?

    <p>The spectral window increases</p> Signup and view all the answers

    What happens to the reflected frequencies when red blood cells are moving towards the transducer location?

    <p>They reflect back higher frequencies</p> Signup and view all the answers

    Study Notes

    Doppler Gain and Cursor Angle in Ultrasound Imaging

    • Doppler Gain adjusts the displayed amplitude of the reflected frequency shifts from flowing blood.
    • Overgaining can cause overestimation of flow velocities and pressure gradients.
    • The optimum angle between the cursor and the blood flow is 0 degrees or parallel to the flow.
    • Flow velocity will be miscalculated when an angle of incidence greater than 20 degrees off axis is present.
    • Changing the cursor angle changes the velocity calculated from the frequency shift detected.
    • The spectral tracing in ultrasound imaging has its own gain, with brighter whites indicating stronger echoes from closer blood cells.
    • Adjusting the gain can make the waveform too bright or too dark, affecting the measurement accuracy.
    • The gain knob for color Doppler adjusts the amount of color seen within the color box.
    • Overgaining in color Doppler can cause flashing and bleeding of color, while undergaining can make it appear as if no flow is occurring.
    • Temporal compounding, also known as persistence or temporal averaging, is used to improve signal-to-noise ratio on color images.
    • Temporal compounding combines multiple frames in one image, reducing noise and increasing signal-to-noise ratio.
    • Increased frame averaging leads to increased signal-to-noise ratio but decreased temporal resolution, and it cannot be used for rapidly moving structures.

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    Description

    Test your knowledge on Doppler gain adjustment and cursor angle in ultrasound imaging. Learn about the impact of overgaining and cursor angle on flow velocity and pressure gradient calculations.

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