X - Rays in Medicine
X-Rays:
- High frequency
- Short wavelength
- Electromagnetic wave
- Are absorbed by bones and pass through tissues
- Are ionising
CCD'S are silicon chips (the size of postage stamps) with identical pixels. They detect X-rays and produce electronic signals, used to produce an image.
CT scans use X-Rays (Computerised Axial Tomography) A patient is put in a cylindrical scanner which rotates around them, firing an X-Ray beam through them. It is recieved at a detector the other side. An image like a 2 - D slice is formed.
X-Rays can be used to treat cancer. High doses of X-Rays will kill living cells.
- X-Rays are focuse on the tumour using a wide beam.
- The beam is rotated around the patient keeping the tumour at the centre.
Radiographers wear lead aprons or stand behind a screen to shield themselves. Areas of the patient's body which aren't being scanned are shielded by lead.
- Created by: rubyfleur
- Created on: 16-05-14 17:03
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