Ultrasound

Question 1

What are piezoelectric crystals?

Answer 1

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

Question 2

What is acoustic impedance?

Answer 2

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

Question 3

Z =

Answer 3

p/v

Question 4

What is Z?

Answer 4

acoustic impendance

Question 5

P =

Answer 5

sound pressure (tissue density)

Question 6

V =

Answer 6

velocity

Question 7

Mechanical sector

Answer 7

pie-shaped image

Question 8

Linear array

Answer 8

image is rectangular

Question 9

Curve linear

Answer 9

curved shape

Question 10

How fast does sound travel through air?

Answer 10

333m/sec

Question 11

How fast does sound travel through bone?

Answer 11

4,080m/sec

Question 12

Host fast does sound travel through fat?

Answer 12

1,460m/sec

Question 13

How fast does sound travel through organs/muscle?

Answer 13

1,550-1,580m/sec

Question 14

What frequency is used for small animals?

Answer 14

higher frequency (shorter wavelength)

Question 15

What frequency is used for larger animals?

Answer 15

lower frequency (goes deeper)

Question 16

What is recommended of patients getting an abdominal ultrasound?

Answer 16

should be fasted

Question 17

How many shades of grey are there?

Answer 17

256 shades of grey

Question 18

Echogenicity

Answer 18

tissue that produces enough echoes returning to the transducer

Question 19

Anechoic/Echolucent

Answer 19

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

Question 20

Hyperechoic

Answer 20

appears brighter than surrounding tissue (white)

Question 21

Hypoechoic

Answer 21

appears darker than surrounding tissue (varying shades of grey)

Question 22

Isoechoic

Answer 22

tissue that is equal in appearance to the surrounding tissue

Question 23

What is B-Mode?

Answer 23

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

Question 24

What is M-Mode?

Answer 24

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

Question 25

What is A-Mode?

Answer 25

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

Question 26

What is a doppler?

Answer 26

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

Question 27

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

Answer 27

blood flow is away from transducer

Question 28

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

Answer 28

blood flow is toward the transducer

Question 29

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

Answer 29

1.4m/sec

Question 30

What is a focal zone?

Answer 30

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

Question 31

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

Answer 31

2

Question 32

What is the gain control knob?

Answer 32

controls brightness