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Ultrasound physics - Book questions > Chapter 2 - 14.3 questions > Flashcards

Chapter 2 - 14.3 questions Flashcards

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1
Q

What is the wavelength of 5 MHZ ultrasound in soft tissue ?

A

0.3 mm

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2
Q

What is the wavelength of 10 MHz in bone ?

A

0.4 mm

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3
Q

Given a wavelength of 1 mm and a frequency of 2MHz, what is the propagation velocity ? Do you think this medium is stiffer than soft tissue , blood bone ?

A

2000 m/sec

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4
Q

Stiffness is ____________ related to compressibility , _______ related to elasticity _______- related to inelasticity

A

inversely related
inversely related
directly related

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5
Q

If the transmit voltage is increased from 2 - 4 volts , the frequency will ______-

A

not change

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6
Q

Frequency of ultrasound, infrasound, audible, and diagnostic ultrasound

A

infrasound 0-20 Hz
audible 20-20 kHz
ultrasound >20 kHz
diagnostic ultrasound 2 MHz - 10 MHz

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7
Q

What happens to the intensity if the amplitude is increased by a factor of 3.

A

intensity increase by a factor of 9

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8
Q

What happens to the intensity if the power is increased by a factor of 3 ?

A

intensity increases by a factor of 3

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9
Q

What happens to the intensity if the area is increase by a factor of 2 ?

A

intensity decrease by a factor of 2

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10
Q

If we keep the area fixed, and if the intensity increases by a factor of 4, what change has occurred to the amplitude?

A

Amplitude has increase by a factor of 2

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11
Q

The frequency is determined strictly by the wave __________

A

source

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12
Q

The period of a wave is det. strictly by the wave __________

A

source

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13
Q

The propagation velocity is det. strictly by the properties of the _________.

A

medium

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14
Q

The 2 two properties of the medium which determine the propagation velocity are _____________ (related to density) and _____ (related to compressibility and stiffness)

A

inertia

elasticity

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15
Q

The propagation velocity ___________ with increased density (assume no change in stiffness)

A

decreases

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16
Q

As the density decreases, the propagation velocity ________ (assume no change in stiffness)

A

increases

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17
Q

A stiff material is not very elastic , so stiffness and elasticity are ________ related.

A

inversely

18
Q

A material which is inelastic is a stiff material and therefore has a high __________ velocity.

A

propagation

19
Q

Inelasticity and incompressibility are related to ___________

A

stiffness

20
Q

Elasticity and ________ are inversely related to stiffness

A

compressibility

21
Q

A gas is generally more compressible than a __________ which is generally more compressible than a solid.

A

a liquid

22
Q

____________ is sound below human hearing

A

infrasound

23
Q

___________ is sound above human hearing.

A

Ultrasound

24
Q

___________ ultrasound is approximately from 2MHz to 10 MHz.

A

Diagnostic

25
Q

All sound waves are _______ mechanical waves.

A

longitudinal

26
Q

Infrasound is below ________.

A

20 Hz

27
Q

Ultrasound is any sound above _________.

A

20kHz

28
Q

_____________ is the rate at which energy is transferred

A

power

29
Q

___________ is proportional to the (amplitude)^2

A

Power

30
Q

If the amplitude is doubled, the power is _______-

A

quadrupled

31
Q

If the amplitude is decreased by a factor of 2, the power is decreased by a factor of ________-

A

four

32
Q

Power is a measured in units of __________

A

watts

33
Q

The _________ is defined as the concentration of energy

A

intensity

34
Q

The fundamental units for __________ is power per area

A

intensity

35
Q

If power is given in Watts and the area is given in ________ the intensity has units of watts/cm^2

A

cm^2

36
Q

If the area is increased by a factor of 2 and the power is unchanged , the intensity is decreased by a factor of ________

A

two

37
Q

If the power increases by a factor of 2 and the area is unchanged, the intensity ___________ by a factor of________.

A

increases

2

38
Q

If the amplitude doubles, the power ______ . If the area is not changed , the intensity is also ________-

A

quadruples

quadruples

39
Q

Intensity is proportional to the ____________ which is proportional to the ___________ squared

A

power

amplitude

40
Q

The intensity is inversely proportional to the _________.

A

area

Ultrasound physics - Book questions (11 decks)

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