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Medical applications of physics
Description
Physics (Further) Mind Map on Medical applications of physics, created by ryangriscti on 17/11/2013.
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ryangriscti
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ryangriscti
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Resource summary
Medical applications of physics
X-rays
Electromagnetic waves
All waves in the electromagnetic spectrum are transverse waves which can travel through a vacuum
Shorter wavelengths travel the most energy
Gamma rays, x-rays and some ultra-violet rays have enough energy to remove electrons from atoms or molecules and form ions
This is called ionisation
ionising radiation can:
Harm the body
Kill cells
Damage a cells DNA
Cause a mutation leading to cancer
X-ray images
Photographic film exposed to x-rays will turn black
X-rays are transmitted through some materials that are opaque to visible light such as healthy human tissue
Other materials, such as metal and bone, absorb x-rays, and some materials partially absorb them
CT Scans
Computerised tomography is used to build up a three-dimensional image of the inside of an object
To make one, X-ray images are taken from a number of different positions and angles
All the results are processed in a computer to build a three-dimensional X-ray image
It can then be processed in a number of ways, depending on the nature of the investigation carried out
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