2

Chapter 2


Questions



  1. 21. Doppler shift is typically in:

    1. A. Ultrasound range
    2. B. Infrasound range
    3. C. Audible range

  2. 22. Duty factor refers to:

    1. A. Power the transducer can generate
    2. B. Range of frequencies the transducer is capable of
    3. C. Physical properties of the damping material
    4. D. Fraction of time the transducer is emitting ultrasound

  3. 23. Duty factor increases with:

    1. A. Increasing gain
    2. B. Increasing pulse duration
    3. C. Decreasing pulse repetition frequency (PRF)
    4. D. Decreasing dynamic range

  4. 24. Which of the following will increase the PRF?

    1. A. Reducing depth
    2. B. Decreasing transducer frequency
    3. C. Reducing sector angle
    4. D. Reducing filter

  5. 25. Persistence will have this effect on the image:

    1. A. Smoothening of a two-dimensional image
    2. B. Better resolution
    3. C. Eliminating artifacts
    4. D. Spuriously reducing wall thickness

  6. 26. Aliasing occurs in this type of imaging:

    1. A. Pulsed wave Doppler
    2. B. Continuous wave Doppler
    3. C. None of the above
    4. D. All of the above

  7. 27. The Nyquist limit at a PRF of 1000 Hz is:

    1. A. 500 Hz
    2. B. 1000 Hz
    3. C. 2000 Hz
    4. D. Cannot calculate

  8. 28. The Nyquist limit can be increased by:

    1. A. Increasing the PRF
    2. B. Reducing the PRF
    3. C. Neither

  9. 29. The Nyquist limit can also be increased by:

    1. A. Increasing transducer frequency
    2. B. Reducing transducer frequency
    3. C. Reducing filter
    4. D. None of the above

  10. 30. Aliasing can be reduced by:

    1. A. Decreasing the depth
    2. B. Increasing the PRF
    3. C. Reducing the transducer frequency
    4. D. Changing to continuous wave Doppler
    5. E. All of the above

  11. 31. What is the purpose of the depth or time gain compensation process adjusted by the echo cardiographer and performed in an ultrasound’s receiver?

    1. A. Corrects for depth attenuation and makes the image uniformly bright
    2. B. Eliminates image artifacts
    3. C. Eliminates aliasing
    4. D. None of the above

  12. 32. Which of the following increases the Nyquist limit?

    1. A. Increasing the depth
    2. B. Reducing the sample volume depth
    3. C. Increasing the transducer frequency
    4. D. None of the above

  13. 33. The maximum Doppler shift that can be displayed without aliasing with a PRF of 10 kHz is:

    1. A. 5 kHz
    2. B. 10 kHz
    3. C. Depends on depth
    4. D. Cannot be determined

  14. 34. The PRF is influenced by:

    1. A. Transducer frequency
    2. B. Depth of imaging
    3. C. Both
    4. D. Neither

  15. 35. Two identical structures appear on an ultrasound scan. One is real and the other is an artifact, the artifact being deeper than the real structure. What is this artifact called?

    1. A. Shadowing
    2. B. Ghosting
    3. C. Speed error artifact
    4. D. Mirror image

    Related posts:

    1. 5
    2. 12
    3. 25
    4. 24

    Stay updated, free articles. Join our Telegram channel
Tags:
Jun 12, 2016 | Posted by in CARDIOLOGY | Comments Off on 2

Full access? Get Clinical Tree
Get Clinical Tree app for offline access