Equipment Operation and Quality Control 1.2 Imaging equipment

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McCrae
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295794
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Equipment Operation and Quality Control 1.2 Imaging equipment
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2015-02-15 12:34:09
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Equipment Operation Quality Control Imaging equipment
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Equipment Operation and Quality Control 1.2 Imaging equipment
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  1. The total brightness gain of an image intensifier is the product of

    1. flux gain

    2. minification gain

    3. focusing gain






     
    1 only 



     
    2 only 



     
    1 and 2 only 



     
    1 and 3 only
    •  
    •  
    • 1 and 2 only
  2. The output phosphor is only a fraction of the size of the input phosphor, and this decrease in image size represents brightness gain, termed _______
    minification gain.
  3. The ratio of the number of x-ray photons at the input phosphor compared to the number light photons at the output phosphor is termed ______
    flux gain.
  4. Total brightness gain is equal to the product of _____ gain and ___ gain
    minification

     flux
  5. Which of the following combinations would pose the least hazard to a particular anode?




     
    0.6-mm focal spot, 75 kVp, 30 mAs 



     
    0.6-mm focal spot, 85 kVp, 15 mAs 



     
    1.2-mm focal spot, 75 kVp, 30 mAs 



     
    1.2-mm focal spot, 85 kVp, 15 mAs
    •  
    •  
    • 1.2-mm focal spot, 85 kVp, 15 mAs
  6. Light-sensitive AEC devices are known as




     
    phototimers 



     
    ionization chambers 



     
    sensors 



     
    backup timers
    •  
    •  
    • phototimers
  7. If a high-voltage transformer has 100 primary turns and 50,000 secondary turns and is supplied by 220 V and 100 A, what are the secondary voltage and current?




     
    200 A and 110 V 



     
    200 mA and 110 kVp 



     
    20 A and 100 V 



     
    20 mA and 100 kVp
    •  
    •  
    • 200 mA and 110 kVp
  8. Total brightness gain is equal to the product of _____ gain and flux gain
    minification

     flux
  9. Which of the following combinations would deliver the least amount of heat to the anode of a three-phase, 12-pulse x-ray unit?




     
    400 mA, 0.12 s, 90 kVp 



     
    300 mA, ½ s, 70 kVp 



     
    500 mA, 1/30 s, 85 kVp 



     
    700 mA, 0.06 s, 120 kVp
    •  
    •  
    • 500 mA, 1/30 s, 85 kVp
  10. The device that receives the remnant beam, converts it into light, and then increases the brightness of that light is the




     
    charge-coupled device (CCD) 



     
    spot-film camera 



     
    image intensifier 



     
    television monitor
    •  
    •  
    • image intensifier
  11. Which of the following is a type of television camera tube that converts a visible image on the output phosphor of the image intensifier into an electronic signal?




     
    Ionization chamber 



     
    Vidicon 



     
    Charge-coupled device 



     
    Cathode ray tube
    •  
    •  
    • Vidicon
  12.  Ionization chambers (A) are found in an automatic exposure control (_____) system.
    AEC


  13. As the x-ray tube filament ages, it becomes progressively thinner because of evaporation. The vaporized tungsten is frequently deposited on the window of the glass envelope. This may















    1. act as an additional filter.
    2. reduce tube output.
    3. result in arcing and tube puncture.







     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  14. The movement of the IP through the transport system of a CR reader is referred to as the:




     
    Slow-scan direction 



     
    Charge-coupled direction 



     
    Nyquist direction 



     
    Fast-scan direction
    •  
    •  
    • Slow-scan direction
  15. This light moves back and forth very rapidly to scan the PSP transversely, in a raster pattern, and this movement of the laser beam across the PSP is therefore called the _____direction 
    fast-scan 
  16. Deposition of vaporized tungsten on the inner surface of the x-ray tube glass window

    1. acts as additional filtration

    2. results in increased tube output

    3. results in anode pitting






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 only
  17. Which of the x-ray circuit devices shown in Figure 6–5 operates on the principle of self-induction?








     
    Number 1 



     
    Number 3 



     
    Number 5 



     
    Number 7
    •  
    •  
    • Number 1
  18. The image intensifier's input phosphor differs from the output phosphor in that the input phosphor




     
    is much larger than the output phosphor 



     
    emits electrons, whereas the output phosphor emits light photons 



     
    absorbs electrons, whereas the output phosphor absorbs light photons 



     
    is a fixed size, and the size of the output phosphor can vary
    •  
    •  
    • is much larger than the output phosphor
  19. It receives the remnant radiation emerging from the patient and converts it into a fluorescent light image
     input phosphor
  20. The fluorescent light image strikes the ______ and is converted to an electron image, which is focused by the electrostatic lenses to the small output phosphor.
    photocathode
  21. Which of the following can record up to twelve images per second during conventional fluoroscopy?




     
    Cassette-loaded spot film 



     
    Flat panel image receptor 



     
    Photospot camera film 



     
    Direct exposure film
    •  
    •  
    • Photospot camera film
  22. The following are disadvantages of a capacitor-discharge mobile unit, except:




     
    The mAs increases during the exposure, called “mAs creep” 



     
    The capacitor may continue to discharge after the exposure 



     
    The actual kilovoltage achieved during an exposure is significantly lower than the set kVp 



     
    At lower kVp settings, the capacitors discharge more slowly and, therefore, a considerable residual kV may exist after the desired exposure time
    •  
    •  
    • The mAs increases during the exposure, called “mAs creep”
  23. Which of the following techniques is used to evaluate the dynamics of a part?




     
    Fluoroscopy 



     
    Stereoscopy 



     
    Tomography 



     
    Phototiming
    •  
    •  
    • Fluoroscopy
  24. Using a multifield image intensifier tube, which of the following input phosphor diameters will provide the greatest magnification?




     
    35 cm 



     
    25 cm 



     
    17 cm 



     
    12 cm
    •  
    •  
    • 12 cm
  25. A device contained within many CR readers that functions to convert light energy released by the PSP into electrical energy, is called a:




     
    Transilluminator 



     
    Photomultiplier tube 



     
    Light gate 



     
    Penetrometer
    •  
    •  
    • Photomultiplier tube
  26. :
    In fluoroscopy, the automatic brightness control is used to adjust the




     
    kVp and mA 



     
    backup timer 



     
    milliamperage (mA) and time 



     
    kilovoltage (kV) and time
    •  
    •  
    • kVp and mA

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