Radiation Heating

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Radiation Heating
2012-08-12 09:32:01

Semester 2, year 2, 2012
Show Answers:

  1. Infared radiation (IRR) superficial or deep?
  2. Microwave (MWD) superficial or deep?
  3. Shortwave (SWD) superficial or deep?
  4. Define eletromagnetic radiation
    Radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
  5. Where does the magnetic field lie in relation to the electircal field?
  6. Is there a medium required for electromagnetic radiation and what direction does it travel in?
    • No medium required
    • Travels in a straight line
  7. Why is MWD deep whereas IRR superficial?
    MWD has longer wavelengths and so can skip over structures to deeper tissues (4-5cm)
  8. What is IRR?
    A superficial thermal agent used for the relief of pain or stiffness
  9. What types of IRR lamps are there and how long does each take to warm up?
    • Luminous - 30 seconds
    • Non-luminous - 5-15 minutes
  10. Temperature, time application and patient positioning for IRR?
    • 40-45 degrees
    • 10-20 minutes
    • 60-75cm
  11. What is microwave diathermy?
    Produces ionic motion of charged molecules = friction = heating
  12. Application time MWD
    20 mins
  13. Safety issues? - interferences
    • Watches
    • Hearing aids
    • Other therapeutic machinery
    • Telephones
    • Pacemakers
  14. Safety
    • Check output on machinery with fluoro tube first
    • The production of heat takes a little while to develop
    • Need to turn up the intensity slowly
    • Wait for the patient to report the first mild sensations of heating
    • Patient perception of heat is critical
    • Totally reliant upon feedback from superficial receptors
    • Instruction that the patient only feel the gentlest wamth is paramount
    • Output meter on the machine is irrelevent
  15. Contraindications to deep heat
    • Inability to communicate
    • Sensory loss
    • Pregnancy
    • Pacemaker
    • Metal