P4 - Ultrasound
Teacher recommended
?- Created by: Naomi
- Created on: 21-01-13 17:53
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- Ultrasound
- Velocity = frequency x wavelength
- It travels as a longitudinal wave containing compressions and rarefactions
- Compressions are regions of higher pressure
- Rarefactions are regions of lower pressure
- Features of a longitudinal wave are:
- They can't travel through a vacuum
- The higher the frequency or pitch, the smaller the wavelength
- The louder the sound, or the more powerful the ultrasound the more energy is carried by the wave and the larger its amplitude
- Uses of ultrasound
- Used to break down kidney stones into smaller pieces
- When ultrasound is used in a body scan, a pulse of ultrasound is sent through the body
- At each boundary between different some ultrasound is reflected, and the rest is transmitted
- The returning echoes are recorded and used to build up an image of the internal structure
- At each boundary between different some ultrasound is reflected, and the rest is transmitted
- Ultrasound is preferred to x-rays because:
- It is able to produce images of soft tissue
- It doesn't damage cells
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