RAD 150 Fluoroscopy - PowerPoint PPT Presentation

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Title:

RAD 150 Fluoroscopy

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Fluoroscopy Fluoro s primary ... Some have TRI input (trifield tubes 27/17/12 cm) ... (TV monitor, photo spot film camera, VCR/CD recorder, cine camera) ... – PowerPoint PPT presentation

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Title: RAD 150 Fluoroscopy


1
RAD 150 Fluoroscopy
  • Fluoros primary function is to enable one to
    view the patient in real time with dynamic
    (motion)

2
Fluoro was first invented by Thomas Edison in 1896
  • Utilized a conventional x-ray unit with a
    fluorescent screen that would convert the x-rays
    exiting the patient to low level light the
    radiologist could view

3
Image Intensified Fluoro
4
II Fluoro
  • Increased image brightness with II over direct
    fluoro is the biggest advantage of II
  • Usually controlled by automatic brightness
    control (ABC) that the radiologist can preset
    and control

5
Eyes use rods and cones
  • Photopic vision daylight vision uses the CONES
  • Scotopic vision - night time vision and uses
    the RODS

6
Fluoro Techniques
  • Fluoro usually is operated at 5 mAs and uses
    highest optimum kVp
  • Protective Fluoro measures
  • Bucky slot cover
  • Lead curtain
  • 5 min back up timer
  • Lead gloves and aprons (secondary barriers!)
  • Distance

7
Image intensifier tube
  • Dang it I couldnt find a diagram to import
    here!!!!!!!
  • Input phosphor
  • Photocathode (photo emission)
  • Evacuated glass envelope
  • Electrostatic focusing lens (neg. charged!!!!)
  • Anode
  • Output phosphor

8
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9
Gain
  • Minification gain ratio of input to output
    sizes
  • Flux gain ratio of of input PHOTONS to output
    LIGHT PHOTONS
  • Brightness gain (total brightness gain)
    minification gain X flux gain

10
Fluoro Magnification
  • Most fluoro II units have dual input phosphor
    sizes (9 and 6 27/17 cm
  • Some have TRI input (trifield tubes 27/17/12
    cm)
  • The crossover of the electron stream distance
    from the output phosphor determines the amount of
    magnification
  • Mag mode better spatial resolution, better
    contrast resolution, HIGHER pt. dose

11
TV Monitoring
  • Must couple the output phosphor to a TV camera
    tube
  • Vidicon tube is MOST frequently used plumbicon
    also can be used
  • Fiber optics and beam splitters are used to help
    direct the digitized image to the various
    destinations (TV monitor, photo spot film camera,
    VCR/CD recorder, cine camera)

12
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13
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