Interaction of sound and media retake

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30 Terms

1
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  1. True or false: As sound travels through the body, it gets stronger.

False

2
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  1. What are created when sound waves strike boundaries in the media.

Attenuation

3
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  1. The weakening of sound as it travels through the body is called:

Attenuation

4
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  1. True or false: Attenuation is directly related to frequency and path length

True

5
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  1. A 3db change reflects _ the original value

Double

6
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  1. True or False: A -10 dB change is 1/10 of the original value

True

7
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  1. True or False: In a logarithmic scale, as the logarithm increases by 1, the actual increase in ten fold

True

8
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  1. True or false: We only need 1 intensity to calculate decibels

False

9
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  1. What three processes contribute to attenuation?

Reflection, scattering, absorption

10
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  1. True or false: Specular reflection happens when a sound wave strikes a smooth surface. This reflection occurs in one directly in an orderly manner.

True

11
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  1. True or false: Diffuse reflection or backscatter occurs when sound waves strike irregular surfaces.

True

12
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  1. True or false: Lung tissue scatter sound due to the air in the alveoli.

True

13
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  1. _ scattering occurs when sound hits a stricture that is smaller than its wavelength.

Rayleigh

14
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  1. True or False: Higher frequency sound with shorter pulses creates more accurate images.

True

15
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  1. True or false: Absorption occurs when sound is converted into another energy form like heat.

True

16
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  1. True or false: Bone absorbs ultrasound energy.

True

17
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  1. This is the distance sound travels in a tissue that reduces the intensity of the sound to one-half of its original value.

Half-value layer

18
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  1. True or false: The half value layer thickness depends on the medium and the frequency of sound.

True

19
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  1. As frequency decreases, depth of penetration

Increases

20
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  1. As the path length increases, the half boundary layer

Stays the same

21
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  1. True or false: Normal incidence is when the sound beam strikes the boundary at exactly 90 degrees.

True

22
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  1. True or false: Oblique incidence is when the sound beam strikes a boundary at any angle besides 90 degrees.

True

23
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  1. What are the three intensity in order?

Incident intensity: The intensity of the sound wave before it strikes a boundary.

Reflected intensity: The intensity of a sound wave that is reflecting after striking a boundary

Transmitted intensity: The intensity of a sound beam that continues forward after striking a boundary.

24
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  1. True or false: if the angle of incidence is normal, than the media on different sides of the boundary must have different impedances to create a reflection.

True

25
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  1. This is a synonym for normal incidence

Perpendicular

26
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  1. True or false: Impedance is the acoustic resistance to sound traveling in a medium.

True

27
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  1. Impedance is measured in:

Rayls

28
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  1. Density * Propagation Speed=

Acoustic impedance

29
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  1. What are the units of half value layer thickness?

Cm

30
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  1. True or false: A large reflection will occur with very different impedances.

True