Physics (medical)

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  • Medical applications of physics
    • Xrays
      • High frequency, short wavelength
      • Used to form images of bones
        • Checks for fractures and dental problems
      • They destroy tumours near the body surface
      • Can damage living tissue cells. This is ionisation. Can make cells become cancerous
      • Workers wear led aprons to protect themselves from radiation from the X-Rays
    • Ultrasound
      • They are sound waves of frequency above 20 000 Hz
      • Can be used in diagnosis and treatment
      • Ultrasound waves are partly reflected at a boundary between two different types of body tissue.
      • An ultrasound scan is non ionising so it's safer than x-rays
      • The distance travelled by an ultrasound can be calculate using an equation.
        • s = v x t
          • s- distance travelled, m
          • v- speed  of ultrasound in metres per second, m/s
          • t- time taken, s


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