Equipment Operation and Quality Control Imaging equipment

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McCrae
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295132
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Equipment Operation and Quality Control Imaging equipment
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2015-02-10 15:53:14
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Equipment Operation Quality Control Imaging equipment
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Equipment Operation and Quality Control Imaging equipment
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  1. TV camera tubes used in image intensification, such as the Plumbicon and Vidicon, function to




     
    increase the brightness of the input-phosphor image. 



     
    transfer the output-phosphor image to the TV monitor. 



     
    focus and accelerate electrons toward the output phosphor. 



     
    record the output-phosphor image on 16- or 35-mm film.
    •  
    •  
    • transfer the output-phosphor image to the TV monitor.
  2. Which of the following systems function(s) to compensate for changing patient/part thicknesses during fluoroscopic procedures?




     
    Automatic brightness control 



     
    Minification gain 



     
    Automatic resolution control 



     
    Flux gain
    •  
    •  
    • Automatic brightness control
  3. In order to erase a CR PSP storage plate, it must be exposed to high-intensity:




     
    Heat 



     
    X-radiation 



     
    Microwaves 



     
    Light
    •  
    •  
    • Light
  4. Phosphors suitable for use in intensifying screens should have which of the following characteristics?

    1. High conversion efficiency

    2. High x-ray absorption

    3. Afterglow






     
    1 only 



     
    1 and 2 only 



     
    3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  5. ____is an undesirable characteristic of phosphors because continued fluorescence causes unpredictable and increased density
    Afterglow 
  6. X-ray tubes used in CT imaging systems must be capable of

    1. high short-exposure rating

    2. tolerating millions of heat units

    3. high-speed anode rotation






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  7. In amorphous selenium flat-panel detectors, the term amorphous refers to a




     
    crystalline material having typical crystalline structure. 



     
    crystalline material lacking typical crystalline structure. 



     
    toxic crystalline material. 



     
    homogeneous crystalline material.
    •  
    •  
    • crystalline material lacking typical crystalline structure.
  8. Dedicated radiographic units are available for















    1. chest radiography.
    2. head radiography.
    3. mammography.






     
    1 only 



     
    2 only 



     
    1 and 2 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  9. The x-ray imaging system that uses a flat panel detector built into the x-ray table is




     
    film/screen system. 



     
    computed radiography. 



     
    direct digital radiography. 



     
    fluoroscopy.
    •  
    •  
    • direct digital radiography.
  10. An AEC device can operate on which of the following principles?

      1. A photomultiplier tube charged by a fluorescent screen



      1. A parallel-plate ionization chamber charged by x-ray photons



      1. Motion of magnetic fields inducing current in a conductor







     
    1 only 



     
    2 only 



     
    1 and 2 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  11. he x-ray tube in a CT imaging system is most likely to be associated with




     
    low-energy photons 



     
    an unrestricted x-ray beam 



     
    a pulsed x-ray beam 



     
    a large focal spot 
    •  
    •  
    • a pulsed x-ray beam 
  12. Any images obtained using dual x-ray absorptiometry (DXA) bone densitometry

    1. are used to evaluate accuracy of the region of interest (ROI)

    2. are used as evaluation for various bone/joint disorders

    3. reflect the similar attenuation properties of soft tissue and bone






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3 
    •  
    •  
    • 1 only 
  13. Component parts of a CT gantry include

    1. high-voltage generator

    2. multidetector array

    3. x-ray tube






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3 
    •  
    •  
    • 1, 2, and 3
  14. Disadvantages of moving grids over stationary grids include which of the following?

    1. They can prohibit the use of very short exposure times.

    2. They increase patient radiation dose.

    3. They can cause phantom images when anatomic parts parallel their motion.






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3 
    •  
    •  
    • 1 and 2 only 
  15. Advantages of battery-powered mobile x-ray units include their

    1. ability to store a large quantity of energy

    2. ability to store energy for extended periods of time

    3. lightness and ease of maneuverability






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3 
    •  
    •  
    • 1 and 2 only
  16. An incorrect relationship between the primary beam and the center of a focused grid results in

    1. an increase in scattered radiation production

    2. grid cutoff

    3. insufficient radiographic density






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3 
    •  
    •  
    • 2 and 3 only 
  17. The line-focus principle expresses the relationship between




     
    actual and effective focal spot 



     
    SID used and resulting density 



     
    exposure given the IR and resulting density 



     
    kilovoltage used and the resulting contrast 
    •  
    •  
    • actual and effective focal spot
  18. The primary parts of the cathode include the
    1. focal track.
    2. filament.
    3. focusing cup.





     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3 
    •  
    •  
    • 2 and 3 only
  19. Which among the following components is (are) part of the gantry of a CT imaging system?

    1. X-ray tube

    2. Detector array

    3. Control panel






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3 

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