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Questions and Answers

Which of the following best describes the resistive index?

  • A value indicating the maximum velocity of the vessel segment
  • A comparison of systolic and diastolic flow velocities
  • A measurement of vascular resistance
  • A calculation of the difference between systolic and diastolic velocities (correct)

    • What does an increased resistive index value indicate?

  • Normal resistance
  • No resistance
  • Increased resistance (correct)
  • Decreased resistance

    • What does a low resistive index value indicate?

  • Normal resistance
  • No resistance
  • High resistance
  • Low resistance (correct)

    • When is the resistive index value 1.0?

    <p>When there is no end diastolic flow</p> Signup and view all the answers

    What does the acceleration time measure?

    <p>Time from onset of systole to point of maximum systolic peak</p> Signup and view all the answers

    What does an increasing cursor angle from 45 to 60 degrees result in?

    <p>Decreased angle between the beam and the flow</p> Signup and view all the answers

    What happens to the detected Doppler shift as the angle between the beam and the flow approaches 90 degrees?

    <p>It approaches zero</p> Signup and view all the answers

    What does spectral broadening indicate?

    <p>The presence of many different flow velocities</p> Signup and view all the answers

    What does an acceleration time of more than 0.07 seconds indicate?

    <p>A tardus parvus waveform</p> Signup and view all the answers

    What is the purpose of the resistive index?

    <p>To evaluate tissue resistance to blood flow</p> Signup and view all the answers

    Which of the following will cause spectral broadening to increase?

    <p>Opening the sample volume to a wider setting</p> Signup and view all the answers

    What is the purpose of adjusting the sample volume width?

    <p>To adjust the amount of flow evaluated in a specific location</p> Signup and view all the answers

    Which of the following is true about smaller sample sizes?

    <p>They produce more accurate color Doppler information</p> Signup and view all the answers

    What effect does increasing the sample depth have on frame rate and color display?

    <p>It decreases the frame rate and reduces color display</p> Signup and view all the answers

    What is the most common Doppler artifact?

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

    Which of the following is a solution for correcting aliasing?

    <p>Increase scale</p> Signup and view all the answers

    How is aliasing corrected in color Doppler?

    <p>The same way as in PW Spectral, except there is no CW option</p> Signup and view all the answers

    What is the most common method to correct aliasing in PW Spectral?

    <p>Increase the PRF</p> Signup and view all the answers

    What effect does increasing the sweep speed have on the amount of Doppler information displayed?

    <p>It decreases the amount of Doppler information displayed</p> Signup and view all the answers

    What is the purpose of adjusting the transducer approach to decrease the distance to the vessel?

    <p>To decrease the amount of Doppler information displayed</p> Signup and view all the answers

    Which of the following best describes the resistive index?

    <p>A calculation of the difference between systolic and diastolic velocities</p> Signup and view all the answers

    What does an increased resistive index value indicate?

    <p>Arterial stenosis</p> Signup and view all the answers

    What is the purpose of the resistive index?

    <p>To evaluate tissue resistance to blood flow</p> Signup and view all the answers

    What does an acceleration time of more than 0.07 seconds indicate?

    <p>High grade arterial stenosis</p> Signup and view all the answers

    What is the most common Doppler artifact?

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

    What happens to the detected Doppler shift as the angle between the beam and the flow approaches 90 degrees?

    <p>It approaches zero</p> Signup and view all the answers

    What does spectral broadening indicate?

    <p>Many different flow velocities present in the sample</p> Signup and view all the answers

    What effect does increasing the sample depth have on frame rate and color display?

    <p>Decreases frame rate and color display</p> Signup and view all the answers

    What effect does increasing the sweep speed have on the amount of Doppler information displayed?

    <p>Decreases the amount of Doppler information displayed</p> Signup and view all the answers

    What is the purpose of adjusting the transducer approach to decrease the distance to the vessel?

    <p>To decrease the angle between the beam and the flow</p> Signup and view all the answers

    Which of the following is true about the relationship between transducer frequency and the detected Doppler shift?

    <p>Increasing the transducer frequency by 1/2 will cause a 50% decrease in the detected Doppler shift.</p> Signup and view all the answers

    What is the best Doppler angle to produce the most accurate Doppler shift information?

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

    What is the most commonly used Doppler angle to provide Doppler shift information?

    <p>60 degrees</p> Signup and view all the answers

    What happens to the Doppler shift as the angle between the beam and the flow decreases?

    <p>The Doppler shift increases.</p> Signup and view all the answers

    What is the purpose of the angle correction control in Doppler imaging?

    <p>To set the Doppler cursor angle.</p> Signup and view all the answers

    What effect does increasing the cursor angle have on the incident angle between the beam and the flow?

    <p>The incident angle increases.</p> Signup and view all the answers

    What effect does increasing the cursor angle have on the calculated velocity?

    <p>The calculated velocity decreases.</p> Signup and view all the answers

    What happens to the calculated velocity if the Doppler cursor line is more than 20 degrees from parallel to the flow?

    <p>The calculated velocity becomes increasingly inaccurate.</p> Signup and view all the answers

    What does a 90-degree Doppler incident angle demonstrate?

    <p>No flow in either direction.</p> Signup and view all the answers

    What is the purpose of adjusting the transducer approach to decrease the distance to the vessel?

    <p>To improve the angle of insonation.</p> Signup and view all the answers

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