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Basics Flashcards

1
Q

What is the speed of sound in tissue?

A

1540m/s

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2
Q

What must be present for sound to travel?

A

Matter

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3
Q

Name the 5 categories of sound.

A 
Infrasound (subsonic)
Audible 
Ultra
Nondiagnostic medical applications 
Medical diagnostic ultrasound
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4
Q

What is the frequency of infrasound (subsonic)?

A

Below 20 Hz

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5
Q

What is the frequency of audible sound?

A

20-20,000Hz

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6
Q

What is the frequency of ultrasound?

A

Above 20,000Hz

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7
Q

What is the frequency of nondiagnostic medical applications?

A

Less than 1MHz

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8
Q

What is the frequency of medical diagnostic ultrasound?

A

Greater than 1MHz

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9
Q

What does a piezo-electric crystal do?

A

Converts electrical signals to mechanical and vice versa

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10
Q

What is the name of the crystal in the transducer?

A

Piezo-electric crystal

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11
Q

What is distance (d) proportional to?

A

Time (t)

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12
Q

What does d stand for?

A

Distance

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13
Q

What is t?

A

Time

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14
Q

What is v?

A

Velocity

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15
Q

How is distance measured ?

A

d =1/2(vxt)

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16
Q

What is the symbol for wavelength?

A

Lambda (looks like fingers walking.) (l)

17
Q

V=?

A

V=fxl

Velocity = frequency x wavelength

18
Q

B mode is short for?

A

Brightness modulation

19
Q

What % does a transducer send and receive?

A

Transmits 1%

Receives 99%

20
Q

What speed does a sound wave propagate in bone?

21
Q

What speed does a sound wave propagate in gas?

22
Q

What speed does a sound wave propagate in tissue?

23
Q

What is obtained when the width of the reflecting object is greater than one fourth of the wavelength of ultrasound?

A

Speculation reflections

24
Q

1 Hz is equal to?

A

1 cycle per second

25
Q

1 MHz is equal to?

A

1 million cycles per second

26
Q

What are 4 other things that use echolocation?

A

Bats
Whales
Dolphins
Submarine SONAR

Ultrasound (3 decks)

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