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Questions and Answers
What is attenuation?
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?
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?
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?
What is impedance?
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What is impedance?
What is impedance?
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What is axial resolution?
What is axial resolution?
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What is refraction?
What is refraction?
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What is axial resolution?
What is axial resolution?
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What is elevational resolution?
What is elevational resolution?
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What contributes to attenuation?
What contributes to attenuation?
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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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