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Doppler Effect
| Question | Answer |
|---|---|
| what is doppler effect? | change in frequency caused by motion of a sound source, receiver, or reflector |
| doppler effect happens because of motion of 3 things: | source receiver reflector |
| if reflector is moving toward the source, then the echo has a _____ frequency | higher |
| if motion is away from source, the frequency of echo is _____ | lower |
| the change of frequency caused by motion is called a _____ _____ | doppler effect |
| the doppler shift is proportional to _____ ____ | flow speed |
| the doppler shift depends on the cosine of the ____ ____ | doppler angle |
| blood flow and tissue motion are the sources of the ____ ____ | doppler effect |
| for flow word the transducer,the doppler shift is ____ | postive |
| for flow away from transducer, the doppler shift is ____ | negative |
| do higher or lower frequencies produce larger doppler shifts? | higher |
| The Doppler shift depends on the _____ of the doppler angle | Cosine |
| The Doppler shift occurs at the interface of each _____ change | Velocity |
| If the ------ speed increases the Doppler shift increases | Scatterer and source |
| This is the difference between the emitted frequency and the echo frequency returning from moving scatterers | Doppler shift |
| what is the best angle for imaging? | 0 , biggest doppler shift |
| worst angle for doppler* imaging? | 90, no doppler shift |
Created by:
lesterstoffels
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