Medical Application of Physics

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  • Created by: Ruby
  • Created on: 24-04-13 20:07
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  • Medical Application of Physics
    • X-Rays
      • Part of the Electromagnetic Spectrum
      • Short wavelength
      • Cause ionisation
      • Affect a photographic film in the same way as light
      • Absorbed by Metal and Bone
        • High doses can kill living cells. Low doses can cause cell mutation and cancerous growth.
      • Transmitted by a healthy tissue
      • Wavelength is of the same order of magnitude as the diameter of an atom
      • Used for Medical Purposes
        • CT Scans, Bone Fractures, Dental Problems and killing Cancer Cells
        • The use of charge-coupled devices (CCDs) allow images to be formed electronically
        • Precautions should be taken when X-ray Machines and CT scanners are in use
    • Ultrasound
      • The range of human hearing is about 20hz-20,000hz
      • Electronic systems can be used to produce ultrasound waves which have a frequency higher than the upper limit of hearing for humans
      • Partially reflected when they meet a boundary between two different media
        • The time taken for the reflections to reach a detector can be used to determine how far away such a boundary is
        • Distance between interfaces in various media: s = v x t
      • Can be used for medical purposes
        • Prenatal scanning
        • Removal of Kidney Stones

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