Week 1 - Lesson 1 Flashcards
Who invented the radar doppler effect?
Christian Dopper
- 1842
How did Christian Doppler observe the doppler effect?
He observed that the frequency of light and sound waves were affected by the relative motion of the source and the detector
What are other uses for radar doppler? (5)
- Air defence
- Air traffic control
- Sounding satellites
- Police speed gun
- Radiology
Where do we use doppler when scanning the body? (2)
- Peripheral vascular
2. Cerebral vascular
Where does peripheral vascular extend to?
The extremities
Where does cerebral vascular extend to?
The head/brain
What clinical applications is doppler used in? (3)
- Waveform analysis
- Localizing blood flow
- 2D gray scale mapping of blood vessels
What was considered an important advance for doppler? (2)
The development of…
- Duplex scanning
- Color Doppler scanning
What 2 things have led to many clinical applications?
- Real time velocity measurements
2. Flow mapping
What can you visually see with real time velocity?
Waveforms
What is velocity called on during spectral doppler? (2)
- Scale
2. PRF
What are the units for velocity during real time measurements?
cm/s
Velocity
How fast the red blood cells are moving per second
What does it mean if the waves are above the baseline?
It is moving towards the transducer
What does it mean if the waves are below the baseline?
It is moving away from the the transducer
