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P3

Meg Turvey Inglés 5 fichas

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1CAT scanner-uses x-rays to scan body
-detailed images
-3D images can be built up
-expensive
-relatively high radiation dose
2Ultrasound scanner-high-frequency sound waves are reflected by features inside a patient's body
-very low risk
-allow a real time image to be viewed
3Endoscope-uses fibre optics to provide live view of the internal structure in a patient
-provided direct, real time view of internal body tissue
-allows key hole surgery without the need for major surgery
-cannot see through tissue
4what effects light intensity?distance- the greater the distance, the lower the intensity.
Energy spreads out from a source in different directions, so as distance increases the energy is spread over an increasing area
5what two features focus an image in an eye?cornea and lens
image then forms on retina