Equipment Operation and Quality Control 1.2 Imaging equipment

  1. The total brightness gain of an image intensifier is the product of

    1. flux gain

    2. minification gain

    3. focusing gain





    A
     
    1 only 


    B
     
    2 only 


    C
     
    1 and 2 only 


    D
     
    1 and 3 only
    • Image Upload 1
    •  
    • C
    •  
    • 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?



    A
     
    0.6-mm focal spot, 75 kVp, 30 mAs 


    B
     
    0.6-mm focal spot, 85 kVp, 15 mAs 


    C
     
    1.2-mm focal spot, 75 kVp, 30 mAs 


    D
     
    1.2-mm focal spot, 85 kVp, 15 mAs
    • Image Upload 2
    •  
    • D
    •  
    • 1.2-mm focal spot, 85 kVp, 15 mAs
  6. Light-sensitive AEC devices are known as



    A
     
    phototimers 


    B
     
    ionization chambers 


    C
     
    sensors 


    D
     
    backup timers
    • Image Upload 3
    •  
    • A
    •  
    • 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?



    A
     
    200 A and 110 V 


    B
     
    200 mA and 110 kVp 


    C
     
    20 A and 100 V 


    D
     
    20 mA and 100 kVp
    •  
    • B
    •  
    • 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?



    A
     
    400 mA, 0.12 s, 90 kVp 


    B
     
    300 mA, ½ s, 70 kVp 


    C
     
    500 mA, 1/30 s, 85 kVp 


    D
     
    700 mA, 0.06 s, 120 kVp
    • Image Upload 4
    •  
    • C
    •  
    • 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



    A
     
    charge-coupled device (CCD) 


    B
     
    spot-film camera 


    C
     
    image intensifier 


    D
     
    television monitor
    • Image Upload 5
    •  
    • C
    •  
    • 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?



    A
     
    Ionization chamber 


    B
     
    Vidicon 


    C
     
    Charge-coupled device 


    D
     
    Cathode ray tube
    • Image Upload 6
    •  
    • B
    •  
    • 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.






    A
     
    1 only 


    B
     
    1 and 2 only 


    C
     
    2 and 3 only 


    D
     
    1, 2, and 3
    • Image Upload 7
    •  
    • D
    •  
    • 1, 2, and 3
  14. The movement of the IP through the transport system of a CR reader is referred to as the:



    A
     
    Slow-scan direction 


    B
     
    Charge-coupled direction 


    C
     
    Nyquist direction 


    D
     
    Fast-scan direction
    • Image Upload 8
    •  
    • A
    •  
    • 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





    A
     
    1 only 


    B
     
    1 and 2 only 


    C
     
    2 and 3 only 


    D
     
    1, 2, and 3
    • Image Upload 9
    •  
    • A
    •  
    • 1 only
  17. Which of the x-ray circuit devices shown in Figure 6–5 operates on the principle of self-induction?

    Image Upload 10





    A
     
    Number 1 


    B
     
    Number 3 


    C
     
    Number 5 


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



    A
     
    is much larger than the output phosphor 


    B
     
    emits electrons, whereas the output phosphor emits light photons 


    C
     
    absorbs electrons, whereas the output phosphor absorbs light photons 


    D
     
    is a fixed size, and the size of the output phosphor can vary
    •  
    • A
    •  
    • 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?



    A
     
    Cassette-loaded spot film 


    B
     
    Flat panel image receptor 


    C
     
    Photospot camera film 


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



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


    B
     
    The capacitor may continue to discharge after the exposure 


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


    D
     
    At lower kVp settings, the capacitors discharge more slowly and, therefore, a considerable residual kV may exist after the desired exposure time
    • Image Upload 11
    •  
    • A
    •  
    • The mAs increases during the exposure, called “mAs creep”
  23. Which of the following techniques is used to evaluate the dynamics of a part?



    A
     
    Fluoroscopy 


    B
     
    Stereoscopy 


    C
     
    Tomography 


    D
     
    Phototiming
    • Image Upload 12
    •  
    • A
    •  
    • Fluoroscopy
  24. Using a multifield image intensifier tube, which of the following input phosphor diameters will provide the greatest magnification?



    A
     
    35 cm 


    B
     
    25 cm 


    C
     
    17 cm 


    D
     
    12 cm
    • Image Upload 13
    •  
    • D
    •  
    • 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:



    A
     
    Transilluminator 


    B
     
    Photomultiplier tube 


    C
     
    Light gate 


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



    A
     
    kVp and mA 


    B
     
    backup timer 


    C
     
    milliamperage (mA) and time 


    D
     
    kilovoltage (kV) and time
    • Image Upload 14
    •  
    • A
    •  
    • kVp and mA
Author
McCrae
ID
295794
Card Set
Equipment Operation and Quality Control 1.2 Imaging equipment
Description
Equipment Operation and Quality Control 1.2 Imaging equipment
Updated