1a2 marks
This question is about the medical use of ultrasound.
a)
In ultrasound scanning, explain what is meant by impedance (acoustic) matching and how it may be achieved.
[2]
1b2 marks
b)
There are several different types of ultrasound scanning techniques.
Explain how an A-scan could be used to measure the thickness of a patient’s eye lens.
You may draw a diagram to help with your answer.
[3]
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