Physics Ultrasound Bioeffects US

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Ultrasound Physics Quizzes & Trivia

BIOEFFECTS US


Questions and Answers
  • 1. 
    Which artifact results in improper side by side positioning of reflectors
    • A. 

      Multipath

    • B. 

      Comet tail

    • C. 

      Refraction

    • D. 

      Reverberation

  • 2. 
    Which process causes mirror image artifact
    • A. 

      Reflection

    • B. 

      Refraction

    • C. 

      Propagation speed error

    • D. 

      Attenuation

  • 3. 
    What are the characteristics of medium that produces comet tail artifact?
    • A. 

      Weak reflectors, closely spaced, low propagation speeds

    • B. 

      Strong reflectors, widely spaced, high propagation speeds

    • C. 

      Strong reflectors, closely spaced, low propagation speed

    • D. 

      Strong reflectors, closely spaced, high propagation speed

  • 4. 
    What is a comet tail artifact's fundamental mechanism of formation?
    • A. 

      Reflection

    • B. 

      Rarefaction

    • C. 

      Refraction

    • D. 

      Attenuation

  • 5. 
    In diagnostic imaging, how does multipath artifact affect the image?
    • A. 

      Poor angular resolution

    • B. 

      Creation of hyperechoic regions

    • C. 

      Mild image degradation

    • D. 

      Gross horizontal misregistration

  • 6. 
    What causes side lobe artifact?
    • A. 

      Sound beam bending

    • B. 

      Linear array transducers architecture

    • C. 

      Unexplectedly low acoustic attenuation

    • D. 

      Acoustic energy radiating in a direction other than the beam's main axis

  • 7. 
    Grating lobes are most common with which type of transducer technology?
    • A. 

      Annular array

    • B. 

      Continuous wave

    • C. 

      Mechanical scanner

    • D. 

      Linear arrays

  • 8. 
    True or False Grating lobes are a result of substantial acoustic energy directed outward from a linear array transducer, but not along the main axis of the sound beam.
    • A. 

      True

    • B. 

      False

  • 9. 
    Which technique of linear array transducers design has virtually elimated the appearance of grating lobe artifact on modern ultrasound systems?
    • A. 

      Demodulation

    • B. 

      Subdicing

    • C. 

      Deconvolution

    • D. 

      None of the above

  • 10. 
    Grating lobes are attributed only to array transducers.
    • A. 

      True

    • B. 

      False

  • 11. 
    How is shadowing artifact expressed?
    • A. 

      Position structures too deep on the image

    • B. 

      Locating structures in improper lateral position

    • C. 

      Placing reflections in multiple locations

    • D. 

      Reflectors being absent on the image

  • 12. 
    Which of these produces shadowing
    • A. 

      Reverberation

    • B. 

      Multipath

    • C. 

      Reflection

    • D. 

      Attenuation

  • 13. 
    Acoustic focusing of an ultrasound beam may create which artifact
    • A. 

      Side lobes

    • B. 

      Refraction

    • C. 

      Speckle

    • D. 

      Enhancement

  • 14. 
    Which artifact is created by sound moving through a medium with a propagation speed less than soft tissue?
    • A. 

      Vertical misregistration

    • B. 

      Horizontal misregistration

    • C. 

      Lateral resolution

    • D. 

      Ring down

  • 15. 
    While imaging a test object an ultrasound system displays one image 1.8 cm deeper than another.  Upon measuring the test object, it is found that it is actually 2.0 cm deeper.  What conslucsion can be drawn from this?
    • A. 

      Soeed of sound in the test object is the same as soft tissue

    • B. 

      Speed in the test object is less than that in soft tissue

    • C. 

      Attenuation of sound in the test object is less than in soft tissue

    • D. 

      Speed in soft tissue is less than that of the test object

  • 16. 
    If an ultrasound pulse travels through a large mass in the body at a speed of 1.2 mm/us, what happens to the position of all echoes produced from reflectors shallower than the mass?
    • A. 

      They are placed in too shallow a location on the image

    • B. 

      They are placed in too deep a location on the image

    • C. 

      They are likely to be placed at the correct depth

  • 17. 
    If a sound pulse travels through a large mass at a speed of 1.2 mm/us, what happens to the position of echoes from reflectors deeper than the mass?
    • A. 

      They are placed in too shallow a location on the image

    • B. 

      They are placed in too deep a location on the image

    • C. 

      They are likelyto be placed at the correct depth

  • 18. 
    Which artifact is not affected by the shape or dimensions of an ultrasound pulse?
    • A. 

      Lateral resolution

    • B. 

      Slice thickness

    • C. 

      Mirror imaging

    • D. 

      Longitudinal resolution

  • 19. 
    True or False.  Side lobe, grating lobe and refraction artifacts all reduce lateral resoltuion.
    • A. 

      True

    • B. 

      False

  • 20. 
    True or False.  Artifacts are likely to appear when the dimensions of the sound beam area are larger thant the dimensions of the reflections in the body.
    • A. 

      True

    • B. 

      False

  • 21. 
    True or False.  It is generally believed that the effects of ultrasound of biologic media are minimal.
    • A. 

      True

    • B. 

      False

  • 22. 
    Which of these terms best describe the empirical investation of bioeffects?
    • A. 

      Cause - effect

    • B. 

      Exposure - response

    • C. 

      Cause - response

    • D. 

      Exposure - cure

  • 23. 
    TRUE OR FALSE.  The mechanistic approach to the study of bioeffects and safety includes the identification of a theoretical construct that could produce an effect.
    • A. 

      True

    • B. 

      False

  • 24. 
    True or Fales.  The emprical approach to the study of bioeffects and ultrasonic safety surveys data involves the finding a relationship between exposure and toxic effects.
    • A. 

      True

    • B. 

      False

  • 25. 
    A bioeffect identified through the mechanistic approach rather than by the empirical approach is more likely to have clinical significance.
    • A. 

      True

    • B. 

      False

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