Lesson 1 (Part 1)

Question 1

What are 2 types of diagnostic ultrasound?

Answer 1

1. Grey scale ultrasound

2. Doppler ultrasound

Question 2

What is an example of grey scale U/S?

Answer 2

Pulse echo technique

Question 3

What is an example of doppler U/S?

Answer 3

Pulse echo + doppler

Question 4

What does sono mean?

Answer 4

Sound

Question 5

What does graph mean?

Answer 5

To write

Question 6

What does the brightness of the echo determine?

Answer 6

The echo strength

- depends on the reflector

Question 7

What are 2 other names for grey scale U/S?

Answer 7

1. 2D imaging

2. B mode

Question 8

What does B mode mean?

Answer 8

Brightness

Question 9

Why do we hear explosions after the fact?

Answer 9

Light travels faster than sound

Question 10

What is the source of all sound?

Answer 10

Vibrations

Question 11

What medium does sound travel faster in?

Answer 11

Solids

Question 12

Can sound travel through a vacuum?

Answer 12

No

- a medium is required

Question 13

What is loudness measured in?

Answer 13

Decibels

Question 14

What happens to the pitch if frequency is increased?

Answer 14

It increases

Question 15

If you heard something loud through the wall, what would you hear?

Answer 15

Low pitch sounds

Question 16

What makes a sound louder or quieter?

Answer 16

Wave amplitude

Question 17

What happens to the sound when you have a large amplitude?

Answer 17

You get a large sound

Question 18

What happens to the sound when you have a small amplitude?

Answer 18

You get a quieter sound

Question 19

What type of wave is sound?

Answer 19

Mechanical

Question 20

What are 2 examples of electromagnetic waves?

Answer 20

1. Radio waves

2. X-rays

Question 21

What range of frequencies can humans hear?

Answer 21

20Hz - 20,000Hz

Question 22

Is light a mechanical wave?

Answer 22

No

Question 23

How does an ultrasound work? (4)

Answer 23

1. Send a pulse through the transducer
2. It goes out and hits something (like an organ)
3. Reflects back
4. Creates an echo

Question 24

What does it mean when you have a bright echo?

Answer 24

You have hit a strong structure

-eg) bone, diaphragm, Ca structures

Question 25

How will fluid appear in an echo?

Answer 25

Anechoic

- black

Question 26

What are 3 common sonographic scan formats?

Answer 26

1. Linear
2. Sector
3. Combination of the two
   - linear and sector

Question 27

What is the formula for distance?

Answer 27

Speed x Time

Question 28

What is the formula for time?

Answer 28

Distance / Speed

Question 29

What is the formula for Speed?

Answer 29

Distance / Time