Flashcards in Lesson 1 (Part 1) Deck (29)
What are 2 types of diagnostic ultrasound?
1. Grey scale ultrasound
2. Doppler ultrasound
What is an example of grey scale U/S?
Pulse echo technique
What is an example of doppler U/S?
Pulse echo + doppler
What does sono mean?
What does graph mean?
What does the brightness of the echo determine?
The echo strength
- depends on the reflector
What are 2 other names for grey scale U/S?
1. 2D imaging
2. B mode
What does B mode mean?
Why do we hear explosions after the fact?
Light travels faster than sound
What is the source of all sound?
What medium does sound travel faster in?
Can sound travel through a vacuum?
- a medium is required
What is loudness measured in?
What happens to the pitch if frequency is increased?
If you heard something loud through the wall, what would you hear?
Low pitch sounds
What makes a sound louder or quieter?
What happens to the sound when you have a large amplitude?
You get a large sound
What happens to the sound when you have a small amplitude?
You get a quieter sound
What type of wave is sound?
What are 2 examples of electromagnetic waves?
1. Radio waves
What range of frequencies can humans hear?
20Hz - 20,000Hz
Is light a mechanical wave?
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
What does it mean when you have a bright echo?
You have hit a strong structure
-eg) bone, diaphragm, Ca structures
How will fluid appear in an echo?
What are 3 common sonographic scan formats?
3. Combination of the two
- linear and sector
What is the formula for distance?
Speed x Time
What is the formula for time?
Distance / Speed