Basics of X-ray and Mammographic Systems


X-Ray Tube Filament Assembly



Move cursor to identify components of filament assembly

  • 2 filaments
    • Large
    • Small
  • During first trigger activation of exposure switch
    • Voltage applied to selected focal spot
    • Filament heated to full operating temperature
    • Electrons boil off (Thermionic Emission or Edison Effect)
  • Until high voltage applied to x-ray tube, electrons congregate close to the filament forming electron cloud
  • Negative charge placed on filament cup during exposure to focus electrons

Apply voltage to the filament