- Doctors use radiation to show images of the inside of the body
Visible light reflects off features to form an image, this is used in an endoscope
X-rays are absorbed by some materials inside the body but not others so a negative image is produced, this is used in X-ray photography and CAT scanners
The movement of substances emitting gamma radiation is detected and their positions are shown on a screen, used in PET scanners
High frequency sound waves can reflect off features inside the body to form an image, this is used in an Ultrasound, in an ultrasound scanner.
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