Equipment Operation and Quality Control 1.2 Imaging equipment II

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McCrae
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295903
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Equipment Operation and Quality Control 1.2 Imaging equipment II
Updated:
2015-02-15 13:07:49
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Rad Review Easy
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Rad Review Easy
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  1. Focal-spot blur is greatest




     
    toward the anode end of the x-ray beam 



     
    toward the cathode end of the x-ray beam 



     
    directly along the course of the CR 



     
    as the SID is increased
    •  
    •  
    • toward the cathode end of the x-ray beam
  2. Which of the following will occur as a result of a decrease in the anode target angle?















    1. Less pronounced anode heel effect
    2. Decreased effective focal spot size
    3. Greater photon intensity toward the cathode side of the x-ray tube






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 2 and 3 only
  3. The output phosphor can be coupled with the Vidicon TV camera or charge-coupled device (CCD) via

    1. fiber optics.

    2. an image distributor or lens.

    3. closed-circuit TV.






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  4. f the distance from the focal spot to the center of the collimator's mirror is 6 in., what distance should the illuminator's light bulb be from the center of the mirror?




     
    3 in. 



     
    6 in. 



     
    9 in. 



     
    12 in.
    •  
    •  
    • 6 in.
  5. Off-focus, or extrafocal, radiation is minimized by




     
    avoiding the use of very high kilovoltages 



     
    restricting the x-ray beam as close to its source as possible 



     
    using compression devices to reduce tissue thickness 



     
    avoiding extreme collimation
    •  
    •  
    • restricting the x-ray beam as close to its source as possible
  6. Although the stated focal-spot size is measured directly under the actual focal spot, focal-spot size in fact varies along the length of the x-ray beam. At which portion of the x-ray beam is the effective focal spot the largest?




     
    At its outer edge 



     
    Along the path of the CR 



     
    At the cathode end 



     
    At the anode end
    •  
    •  
    • At the cathode end
  7. What lies immediately under the phosphor layer of a PSP storage plate?




     
    Reflective layer 



     
    Base 



     
    Antistatic layer 



     
    Lead foil
    •  
    •  
    • Reflective layer
  8. Just under the barium fluorohalide layer is a____that helps direct emitted light up toward the CR reader.
     reflective layer 
  9. Below the reflective layer is the ____, behind that is an ____ layer, and then the lead foilto absorb backscatter. 
    base

     antistatic
  10. Over the top of the barium fluorohalide is a ____ layer.
    protective
  11. The batteries in battery-operated mobile x-ray units provide power to

    1. the x-ray tube

    2. machine locomotion

    3. the braking mechanism






     

     
    1 only 



     

     
    2 only 



     

     
    1 and 2 only 

     

     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  12. Image quality in digital fluoroscopy is influenced by















    1. pixel size.
    2. contrast.
    3. noise.






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  13. _______ is degrading to both traditional and digital images. It can result from a number of causes including insufficient mA
    Noise
  14. Which of the following voltage ripples is (are) produced by single-phase equipment















    1. 100% voltage ripple
    2. 13% voltage ripple
    3. 3.5% voltage ripple






     
    1 only 



     
    2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 only
  15. Three-phase, 6-pulse equipment has a __% voltage ripple, 
    13
  16. a three-phase, 12-pulse equipment has only a ___% ripple.
    3.5
  17. Three-phase, 12-pulse equipment comes closest to constant potential, as the voltage never falls below ___% of maximum value.
    96.5
  18. A focal-spot size of 0.3 mm or smaller is essential for which of the following procedures?




     
    Bone radiography 



     
    Magnification radiography 



     
    Tomography 



     
    Fluoroscopy
    •  
    •  
    • Magnification radiography
  19. Which of the following combinations would pose the least hazard to a particular anode?




     
    1.2-mm focal spot, 92 kVp, 1.5 mAs 



     
    0.6-mm focal spot, 80 kVp, 3 mAs 



     
    1.2-mm focal spot, 70 kVp, 6 mAs 



     
    0.6-mm focal spot, 60 kVp, 12 mAs
    •  
    •  
    • 1.2-mm focal spot, 92 kVp, 1.5 mAs
  20. Which of the following field sizes would require the least amount of patient X-ray dosage?




     
    12 cm field 



     
    17 cm field 



     
    25 cm field 



     
    30 cm field
    •  
    •  
    • 12 cm field
  21. To maintain image clarity in an image-intensifier system, the path of electron flow from the photocathode to the output phosphor is controlled by




     
    the accelerating anode 



     
    electrostatic lenses 



     
    the vacuum glass envelope 



     
    the input phosphor
    •  
    •  
    • electrostatic lenses
  22. Component parts of a CT imaging system include a(n)

    1. high-frequency generator

    2. x-ray tube

    3. operator console






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  23. Which of the following devices is used to control voltage by varying resistance?




     
    Autotransformer 



     
    High-voltage transformer 



     
    Rheostat 



     
    Fuse
    •  
    •  
    • Rheostat
  24.  The________ transformer increases the voltage and decreases the current.
     high-voltage
  25. The ____ is a type of variable resistor that is used to change voltage or current values. 
    rheostat

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