Equipment Operation and Quality Control I

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McCrae
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295642
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Equipment Operation and Quality Control I
Updated:
2015-02-12 00:54:49
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Equipment Operation Quality ControlIm
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Rad Ready Review
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  1. To determine how quickly an x-ray tube will disperse its accumulated heat, the radiographer uses a(n)




     
    technique chart. 



     
    radiographic rating chart. 



     
    anode cooling curve. 



     
    spinning top test.
    •  
    •  
    • anode cooling curve.
  2. The ability of an x-ray unit to produce constant radiation output, at a given mA, using various combinations of mAs and time is called




     
    linearity. 



     
    reproducibility. 



     
    densitometry. 



     
    sensitometry.
    •  
    •  
    • linearity.
  3. In digital imaging, artifacts arise from a number of sources, including which of the following?




     
    Imaging hardware 



     
    Image processing software 



     
    Operator error artifacts 



     
    All of these may be sources of image artifacts
    •  
    •  
    • All of these may be sources of image artifacts
  4. All of the following are daily quality control (QC) steps to ensure optimal diagnostic images on a digital display monitor, except:




     
    Turn on the monitor and allow it to warm up 



     
    Evaluate luminance, reflection, noise and glare 



     
    Make sure that the monitor is dust-free on the viewing surface 



     
    Evaluate the QC patterns at the periphery and verify that all letters and numbers appear
    •  
    •  
    • Evaluate the QC patterns at the periphery and verify that all letters and numbers appear
  5. The x-ray beam and collimator light field must coincide to within




     
    10% of the OID 



     
    2% of the OID 



     
    10% of the SID 



     
    2% of the SID
    •  
    •  
    • 2% of the SID
  6. To compensate for variations in gain across a digital receptor, which of the following maintenance steps should be taken?




     
    Conduct a calibration correction for image nonuniformity 



     
    Increase or decrease the exposure factors to compensate 



     
    Install a variable resistor to adjust the electrical supply to the unit 



     
    Keep a log for at least 30 days to confirm consistent variations before making any adjustments
    •  
    •  
    • Conduct a calibration correction for image nonuniformity
  7. A device used to measure the luminance response and uniformity of monitors used in digital imaging is called a




     
    Penetrometer 



     
    Densitometer 



     
    Sensitometer 



     
    Photometer
    •  
    •  
    • Photometer
  8. Environmental background radiation can contribute to a




     
    Ghost artifact 



     
    Moiré artifact 



     
    Static artifact 



     
    Grid cutoff artifact
    •  
    •  
    • Ghost artifact
  9. Too much edge enhancement of the image in digital systems can cause an unwanted artifact called the:




     
    Photoelectric effect artifact 



     
    Scaling artifact 



     
    Hounsfield artifact 



     
    Halo effect artifact
    •  
    •  
    • Halo effect artifact
  10. All of the following are steps that should be used to accomplish quality control (QC) in digital radiography, except:




     
    Acceptance testing 



     
    Establishment of baseline performance 



     
    Monitoring patient size to evaluate variations in equipment performance 



     
    Diagnosis of changes in performance
    •  
    •  
    • Monitoring patient size to evaluate variations in equipment performance
  11. An exposed image plate will retain its original image quality for about




     
    2 hours 



     
    8 hours 



     
    24 hours 



     
    48 hours
    •  
    •  
    • 8 hours
  12. The device used to test the accuracy of the x-ray timer is the




     
    densitometer 



     
    sensitometer 



     
    penetrometer 



     
    spinning top
    •  
    •  
    • spinning top
  13. To ensure proper operation of the digital image display monitor, all of the following are important in order to develop a quality control (QC) program,except:




     
    Routine quality control tests by the QC technologist 



     
    Disassembly and cleaning of the internal monitor control devices by the QC technologist 



     
    Periodic review of the QC program by a qualified medical physicist 



     
    Annual and post-repair medical physics performance evaluations
    Disassembly and cleaning of the internal monitor control devices by the QC technologist 

  14. The image in Figure 6–6 was obtained while testing








     
    rectifier operation in a single-phase x-ray machine. 



     
    rectifier operation in a three-phase x-ray machine. 



     
    timer accuracy in a single-phase x-ray machine. 



     
    timer accuracy in a three-phase x-ray machine.
    •  
    •  
    • timer accuracy in a three-phase x-ray machine.
  15. Which of the following may occur if the X-ray exposure field is not properly collimated, positioned, and sized?




     
    Modulation transfer function failure 



     
    Moiré artifact 



     
    Exposure field recognition errors may occur 



     
    Ghost artifact
    •  
    •  
    • Exposure field recognition errors may occu
  16. Quality control testing of digital display monitors should be conducted




     
    Daily 



     
    Weekly 



     
    Monthly 



     
    Annually
    •  
    •  
    • Daily
  17. Inadequate collimation in CR imaging can result in an image that is too

    1. light

    2. dark

    3. noisy






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  18. Which of the following is (are) tested as part of a QC program?

    1. Beam alignment

    2. Reproducibility

    3. Linearity






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  19. QA was being performed on a three-phase, full-wave-rectified x-ray unit. A synchronous spinning-top test was performed using 300 mA, 60 ms, and 70 kVp, and a 22-degree arc is observed on the test film. Which of the following statements regarding these results is most correct?




     
    The timer is inaccurate. 



     
    The milliamperage station is inaccurate. 



     
    One rectifier is malfunctioning. 



     
    The test results are satisfactory.
    •  
    •  
    • The test results are satisfactory.
  20. Quality Control (QC) testing is used to evaluate digital display monitors in all of the following ways, except




     
    Display luminance response 



     
    Display resolution 



     
    Display matrix size 



     
    Display noise
    •  
    •  
    • Display matrix size
  21. In order to avoid background radiation artifacts when using CR, it is important to:




     
    Erase all image plates that have not been used for 48 hours 



     
    Erase all image plates if there is any question about how long it has been since the plate has been erased 



     
    Erase an image plate if there is any doubt as to when it was last erased, especially in the case of pediatric radiography 



     
    All of these are correct actions
    •  
    •  
    • All of these are correct actions
  22. Radiographs from a particular three-phase, full-wave-rectified x-ray unit, made using known correct exposures, were underexposed. A synchronous spinning top test was performed using 200 mA, 1/12 second, and 70 kVp, and a 20° arc is observed on the test film. Which of the following is mostlikely the problem?




     
    The 1/12-second time station is inaccurate. 



     
    The 200-mA station is inaccurate. 



     
    A rectifier is not functioning. 



     
    The processor needs servicing.
    •  
    •  
    • The 1/12-second time station is inaccurate.

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