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Flashcards in Lesson 1 (Part 1) Deck (29)
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1

What are 2 types of diagnostic ultrasound?

1. Grey scale ultrasound
2. Doppler ultrasound

2

What is an example of grey scale U/S?

Pulse echo technique

3

What is an example of doppler U/S?

Pulse echo + doppler

4

What does sono mean?

Sound

5

What does graph mean?

To write

6

What does the brightness of the echo determine?

The echo strength
- depends on the reflector

7

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

1. 2D imaging
2. B mode

8

What does B mode mean?

Brightness

9

Why do we hear explosions after the fact?

Light travels faster than sound

10

What is the source of all sound?

Vibrations

11

What medium does sound travel faster in?

Solids

12

Can sound travel through a vacuum?

No
- a medium is required

13

What is loudness measured in?

Decibels

14

What happens to the pitch if frequency is increased?

It increases

15

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

Low pitch sounds

16

What makes a sound louder or quieter?

Wave amplitude

17

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

You get a large sound

18

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

You get a quieter sound

19

What type of wave is sound?

Mechanical

20

What are 2 examples of electromagnetic waves?

1. Radio waves
2. X-rays

21

What range of frequencies can humans hear?

20Hz - 20,000Hz

22

Is light a mechanical wave?

No

23

How does an ultrasound work? (4)

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

24

What does it mean when you have a bright echo?

You have hit a strong structure
-eg) bone, diaphragm, Ca structures

25

How will fluid appear in an echo?

Anechoic
- black

26

What are 3 common sonographic scan formats?

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

27

What is the formula for distance?

Speed x Time

28

What is the formula for time?

Distance / Speed

29

What is the formula for Speed?

Distance / Time