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SPI > Sound and media 2 > Flashcards

Sound and media 2 Flashcards

1
Q

How are scattering and absorption related to frequency?

A

Directly related

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2
Q

Does air have high or low attenuation?

A

high attenuation

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3
Q

What term is used to describe the distance sound travels in tissue that reduces the intensity of sound to one-half its original value?

A

Half-value layer thickness

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4
Q

What are the units for half-value layer thickness?

A

unit of length (cm)

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5
Q

What is half-value layer thickness also called?

A
  1. half-boundary layer
  2. depth of penetration
  3. penetration depth
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6
Q

What does half-value layer thickness depend upon?

A

medium & frequency

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7
Q

Does high or low frequency result in thick high-value layer?

A

Low frequency

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8
Q

Does high or low frequency result in thin half-value?

A

high frequency

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9
Q

Does media with a high attenuation have a thin or thick half- value?

A

thin half- value

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10
Q

Does media with a low attenuation have a thin or thick half-value?

A

thick half- value

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11
Q

What term is used to describe acoustic resistance to sound traveling through a medium?

A

impedance

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12
Q

What is crucial to the ability of ultrasound to image objects deep within the body?

A

transmission

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13
Q

What term in an important tissue property that influences the amount of reflection?

A

acoustic transmission

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14
Q

How is acoustic impedance calculated?

A

density of the medium x propagation speed

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15
Q

What does the reflection of a sound wave depend upon?

A

difference in acoustic impedance of the two media

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16
Q

True or false, a tissues impedance is measured not calculated.

A

False, a tissue’s impedance is CALCULATED not measured.

17
Q

What are the units of impedance?

A

Rayls (z)

18
Q

What is impedance determined by?

A

Medium

19
Q

What is another name for acoustic impedance?

A

Characteristic impedances

20
Q

What determines the behavior of a pulse

A

The angle at which a wave hits a boundary

21
Q

What does an acute angle mean?

A

less than 90 degrees

22
Q

What does a right angle mean?

A

exactly 90 degrees

23
Q

What does an obtuse angle mean?

A

Greater 90 degrees

24
Q

What are angles with measurements other than 90 degrees called?

A

oblique angles

25
Q

True or false, both acute and obtuse angles are oblique angles?

A

True

26
Q

What is the term used to describe a sound beam striking a boundary at exactly 90 degrees?

A

Normal indcidence

27
Q

What are other terms for normal incidences?

A
  1. Perpendicular
  2. Orthogonal
  3. right angle
  4. 90 degree
28
Q

What occurs when a sound beam strikes a boundary at any other angle than 90 degrees?

A

Oblique incidence

SPI (10 decks)

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