P3

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  • Created by: Romilly
  • Created on: 18-05-13 11:43
What are X-rays?
High frequency, short wavelength, electromagnetic waves.
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What are X-rays absorbed by?
Metal and bone
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What do CT scans use to produce high resolution images and how do they?
CT scans use lots of X-rays, they form images of soft tissue because the detectors measure how much X-ray get through so can distinguish between between differences in tissue densities.
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What is ultrasound?
Ultrasound is any sound above 20,000Hz
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What is the focal length?
The distance from the center of the lens (lens axis) to the point where the lenses principle focus is.
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Where does most of the focusing happen in the eye?
The cornea and some in the lens.
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Which lens produces a negative power?
Diverging/concave
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Other cards in this set

Card 2

Front

What are X-rays absorbed by?

Back

Metal and bone

Card 3

Front

What do CT scans use to produce high resolution images and how do they?

Back

Preview of the front of card 3

Card 4

Front

What is ultrasound?

Back

Preview of the front of card 4

Card 5

Front

What is the focal length?

Back

Preview of the front of card 5
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