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Ultrasound Physics > Interaction of sound & mediaCh 6 & Range equation Ch7 > Flashcards

Interaction of sound & mediaCh 6 & Range equation Ch7 Flashcards

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1
Q

Method of rating numbers. The numbers of 10’s that are multiplied to create the original number

A

Logarithm

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2
Q

The strength of sound beams and brightness of images are measured in this unit

A

Decibel

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3
Q

Reports relative changes and is a ratio with two intensities starting level and actual level

A

Decible notation

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4
Q

3db

A

double

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5
Q

-3db

A

half

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6
Q

10db

A

ten times larger

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7
Q

-10db

A

one tenth

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8
Q

6db

A

four times larger

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9
Q

-6db

A

one fourth

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10
Q

Two factors that determine attenuation

A

Path length and frequency of sound

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11
Q

How are distance and attenuation related?

A

Directly

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12
Q

How are frequency and attenuation related?

A

Directly

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13
Q

Is decibles relative or absolute change?

A

Relative

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14
Q

Is attenuation relative or absolute change?

A

Relative

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15
Q

longer distance

A

more attenuation

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16
Q

higher frequency

A

more attenuation

17
Q

Shorter distance

A

less attenuation

18
Q

lower frequency

A

less attenuation

19
Q

Process that contribute to attenuation

A

Reflection, scattering, and absorption

20
Q

Reflection in only one direction with a smooth boundary

A

Specular reflection

21
Q

Irregular boundaries reflection that radiates in more than one direction

A

Diffuse reflection or backscatter

22
Q

Random redirection of sound in many directions

A

Scattering

23
Q

How are scattering and frequency related?

A

directly

24
Q

Scattering when the structure’s dimensions are much smaller than the beam’s wavelength . Scatters the sound wave in equally in all directions.

A

Rayleigh Scattering

25
Q

Which scatter results with an organized boundary?

A

specular or Rayleigh scatter

26
Q

Which scatter results with an unorganized boundary?

A

Diffuse or scattering

27
Q

Whats the significance of attenuation in diagnostic sonography?

A

Higher frequency produce shorter waves which create more accurate images. However higher freq attenuates more and is less capable of traveling far or deeper.

28
Q

When ultrasound is converted into another energy form like heat.

A

Absorption

29
Q

How are absorption and frequency related?

A

Directly

30
Q

The number of db of attenuation that occurs when sound travels one cm db/cm

A

Attenuation coefficient

31
Q

The constant value for the attenuation coefficient

A

2db/cm

Ultrasound Physics (6 decks)

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