Term
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Definition
| A pressure wave with a frequency > 20,000 Hz |
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Term
| What is the range of frequencies used in adult echo? |
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Definition
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Term
True or False
Sound exists in outer space |
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Definition
False
Sound is a pressure wave consisting of alternating compression and rarefaction (spreading apart) of molecules. The pressure wave must travel through something. |
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Term
| What is the speed of sound in tissue? |
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Definition
1540 m/s
Speed varies according to the density and stiffness of the kind of tissue it travels through. But 1540 m/s is used by the computer to calculate distance |
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Term
| Loss of signal power is called attenuation. What tissue causes the most attenuation? |
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Definition
Lung
Air/tissue interfaces reflects so much ultrasound that lung tissue cannot be penetrated |
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