Sound Waves and Ultrasound Imaging

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Questions and Answers

What is attenuation?

  • The scattering of sound waves in a medium.
  • The amplification of sound intensity, power, and amplitude
  • The reduction of sound intensity, power, and amplitude (correct)
  • The reflection of sound waves in a medium.

What is the half-layer thickness?

  • The distance sound travels in a tissue that reduces the sound intensity to a quarter of its original value
  • The distance sound travels in a tissue that reduces the sound intensity to one-third of its original value
  • The distance sound travels in a tissue that reduces the sound intensity to half its original value (correct)
  • The distance sound travels in a tissue that reduces the sound intensity to one-fifth of its original value

What is half-layer thickness?

  • The distance sound travels in a tissue that scatters the sound waves.
  • The distance sound travels in a tissue that amplifies the sound intensity to double its original value
  • The distance sound travels in a tissue that reflects the sound waves.
  • The distance sound travels in a tissue that reduces the sound intensity to half its original value (correct)

What is impedance?

<p>The acoustic resistance to sound traveling in a medium and is calculated by multiplying the density of a medium by the speed at which sound travels in the medium. (C)</p> Signup and view all the answers

What is impedance?

<p>The acoustic resistance to sound traveling in a medium. (A)</p> Signup and view all the answers

What is axial resolution?

<p>The ability of a system to display two structures that are very close together when the structures are parallel to the sound beam's main axis. (A)</p> Signup and view all the answers

What is refraction?

<p>A change in direction of wave propagation when traveling from one medium to another. (B)</p> Signup and view all the answers

What is axial resolution?

<p>The ability of a system to display two structures that are very close together when the structures are parallel to the sound beam's main axis. (C)</p> Signup and view all the answers

What is elevational resolution?

<p>The ability to distinguish whether reflections on the image are created from structures directly in the imaging plane or from structures that lie above or below the imaging plane (A)</p> Signup and view all the answers

What contributes to attenuation?

<p>Reflection, scattering, and absorption. (C)</p> Signup and view all the answers

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Study Notes

  • Attenuation is the reduction of sound intensity, power, and amplitude.
  • Attenuation is directly related to distance and frequency, and measured in decibels (dB).
  • Reflection, scattering, and absorption contribute to attenuation.
  • Half-layer thickness is the distance sound travels in a tissue that reduces the sound intensity to half its original value.
  • Impedance is the acoustic resistance to sound traveling in a medium and is calculated by multiplying the density of a medium by the speed at which sound travels in the medium.
  • Refraction is a change in direction of wave propagation when traveling from one medium to another.
  • Lateral resolution is the ability to identify two structures that are close together when they are side by side or perpendicular to the main axis of the sound beam.
  • Temporal resolution is the ability to position moving structures from instant to instant.
  • Elevational resolution distinguishes whether reflections on the image are created from structures directly in the imaging plane or from structures that lie above or below the imaging plane.
  • Axial resolution measures the ability of a system to display two structures that are very close together when the structures are parallel to the sound beam's main axis.

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