P4.d - Ultrasound

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  • Created by: simonhw
  • Created on: 25-01-16 14:49
Name four uses of ultrasound.
∞checking of foetuses ∞investigating heart and liver problems ∞looking for tumours ∞measuring speed of blood flow
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What does a high powered ultrasound break down in the body?
Kidney and other stones.
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How does ultrasound help in cataract surgery?
Ultrasound breaks down the opaque lens in a cataract sufferer's eye. The defective lens is surgically removed and replaced by an artificial one.
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What happens to the ultrasound pulses between different tissues and organs?
Some are reflected and some are transmitted.
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What happens to the returning echoes from the scan?
They are recorded and used to build up an image of the internal structure.
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Why is a gel put between the ultrasound probe and the patient's skin during the scan?
Without it, almost all ultrasound would be reflected at the skin and the image would be bad.
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How do you work out the depth of each structure in the body?
Speed = distance/time
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What two things does the proportion of ultrasound reflected depend on?
∞the densities of tissue ∞the speed of sound in tissues
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What do Doppler Ultrasound scanners do?
Detect movement.
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Name two advantages of ultrasound over x-rays.
∞they differentiate between soft tissue better ∞don't damage living cells
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Other cards in this set

Card 2

Front

What does a high powered ultrasound break down in the body?

Back

Kidney and other stones.

Card 3

Front

How does ultrasound help in cataract surgery?

Back

Preview of the front of card 3

Card 4

Front

What happens to the ultrasound pulses between different tissues and organs?

Back

Preview of the front of card 4

Card 5

Front

What happens to the returning echoes from the scan?

Back

Preview of the front of card 5
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