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Seminar > Ultrasound > Flashcards

Ultrasound Flashcards

1
Q

What are piezoelectric crystals?

A

crystals in the head of the transducer (probe) that are electrically stimulated producing sound waves

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2
Q

What is acoustic impedance?

A

the ability of a tissue to resist or impede transmission of sound depending on density of tissue

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3
Q

Z =

A

p/v

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4
Q

What is Z?

A

acoustic impendance

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5
Q

P =

A

sound pressure (tissue density)

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6
Q

V =

A

velocity

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7
Q

Mechanical sector

A

pie-shaped image

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8
Q

Linear array

A

image is rectangular

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9
Q

Curve linear

A

curved shape

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10
Q

How fast does sound travel through air?

A

333m/sec

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11
Q

How fast does sound travel through bone?

A

4,080m/sec

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12
Q

Host fast does sound travel through fat?

A

1,460m/sec

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13
Q

How fast does sound travel through organs/muscle?

A

1,550-1,580m/sec

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14
Q

What frequency is used for small animals?

A

higher frequency (shorter wavelength)

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15
Q

What frequency is used for larger animals?

A

lower frequency (goes deeper)

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16
Q

What is recommended of patients getting an abdominal ultrasound?

A

should be fasted

17
Q

How many shades of grey are there?

A

256 shades of grey

18
Q

Echogenicity

A

tissue that produces enough echoes returning to the transducer

19
Q

Anechoic/Echolucent

A

tissue that transmits all the sound to deeper tissue, nothing is transmitted back to the transducer so it appears black

20
Q

Hyperechoic

A

appears brighter than surrounding tissue (white)

21
Q

Hypoechoic

A

appears darker than surrounding tissue (varying shades of grey)

22
Q

Isoechoic

A

tissue that is equal in appearance to the surrounding tissue

23
Q

What is B-Mode?

A

brightness mode; real time image, uses pixels or dots on a screen

24
Q

What is M-Mode?

A

motion mode; continuous display over time; allows for measuring cardiac structures and functions

25
Q

What is A-Mode?

A

amplitude mode; earliest form of ultrasound, returning echoes are displayed as a series of peaks on a graph

26
Q

What is a doppler?

A

used to image flow of blood and other liquids while measuring velocity

27
Q

What does the color blue mean when using the color doppler?

A

blood flow is away from transducer

28
Q

What does the color red mean when using the color doppler?

A

blood flow is toward the transducer

29
Q

What is the maximum velocity that a pulse wave doppler can read?

A

1.4m/sec

30
Q

What is a focal zone?

A

ultrasound is focusing the beam depth at that level which should improve detail

31
Q

There can be no more than _____ focal zones at a time.

A

2

32
Q

What is the gain control knob?

A

controls brightness

Seminar (18 decks)

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