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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?
What is impedance?
What is impedance?
What is axial resolution?
What is axial resolution?
What is refraction?
What is refraction?
What is axial resolution?
What is axial resolution?
What is elevational resolution?
What is elevational resolution?
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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