Equipment Operation and Quality Control I

  1. To determine how quickly an x-ray tube will disperse its accumulated heat, the radiographer uses a(n)



    A
     
    technique chart. 


    B
     
    radiographic rating chart. 


    C
     
    anode cooling curve. 


    D
     
    spinning top test.
    • Image Upload 1
    •  
    • C
    •  
    • 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



    A
     
    linearity. 


    B
     
    reproducibility. 


    C
     
    densitometry. 


    D
     
    sensitometry.
    • Image Upload 2
    •  
    • A
    •  
    • linearity.
  3. In digital imaging, artifacts arise from a number of sources, including which of the following?



    A
     
    Imaging hardware 


    B
     
    Image processing software 


    C
     
    Operator error artifacts 


    D
     
    All of these may be sources of image artifacts
    • Image Upload 3
    •  
    • D
    •  
    • 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:



    A
     
    Turn on the monitor and allow it to warm up 


    B
     
    Evaluate luminance, reflection, noise and glare 


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


    D
     
    Evaluate the QC patterns at the periphery and verify that all letters and numbers appear
    • Image Upload 4
    •  
    • D
    •  
    • 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



    A
     
    10% of the OID 


    B
     
    2% of the OID 


    C
     
    10% of the SID 


    D
     
    2% of the SID
    • Image Upload 5
    •  
    • D
    •  
    • 2% of the SID
  6. To compensate for variations in gain across a digital receptor, which of the following maintenance steps should be taken?



    A
     
    Conduct a calibration correction for image nonuniformity 


    B
     
    Increase or decrease the exposure factors to compensate 


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


    D
     
    Keep a log for at least 30 days to confirm consistent variations before making any adjustments
    • Image Upload 6
    •  
    • A
    •  
    • 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



    A
     
    Penetrometer 


    B
     
    Densitometer 


    C
     
    Sensitometer 


    D
     
    Photometer
    • Image Upload 7
    •  
    • D
    •  
    • Photometer
  8. Environmental background radiation can contribute to a



    A
     
    Ghost artifact 


    B
     
    Moiré artifact 


    C
     
    Static artifact 


    D
     
    Grid cutoff artifact
    • Image Upload 8
    •  
    • A
    •  
    • Ghost artifact
  9. Too much edge enhancement of the image in digital systems can cause an unwanted artifact called the:



    A
     
    Photoelectric effect artifact 


    B
     
    Scaling artifact 


    C
     
    Hounsfield artifact 


    D
     
    Halo effect artifact
    • Image Upload 9
    •  
    • D
    •  
    • Halo effect artifact
  10. All of the following are steps that should be used to accomplish quality control (QC) in digital radiography, except:



    A
     
    Acceptance testing 


    B
     
    Establishment of baseline performance 


    C
     
    Monitoring patient size to evaluate variations in equipment performance 


    D
     
    Diagnosis of changes in performance
    • Image Upload 10
    •  
    • C
    •  
    • Monitoring patient size to evaluate variations in equipment performance
  11. An exposed image plate will retain its original image quality for about



    A
     
    2 hours 


    B
     
    8 hours 


    C
     
    24 hours 


    D
     
    48 hours
    • Image Upload 11
    •  
    • B
    •  
    • 8 hours
  12. The device used to test the accuracy of the x-ray timer is the



    A
     
    densitometer 


    B
     
    sensitometer 


    C
     
    penetrometer 


    D
     
    spinning top
    • Image Upload 12
    •  
    • D
    •  
    • 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:



    A
     
    Routine quality control tests by the QC technologist 


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


    C
     
    Periodic review of the QC program by a qualified medical physicist 


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


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

    Image Upload 13





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


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


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


    D
     
    timer accuracy in a three-phase x-ray machine.
    • Image Upload 14
    •  
    • D
    •  
    • 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?



    A
     
    Modulation transfer function failure 


    B
     
    Moiré artifact 


    C
     
    Exposure field recognition errors may occur 


    D
     
    Ghost artifact
    • Image Upload 15
    •  
    • C
    •  
    • Exposure field recognition errors may occu
  16. Quality control testing of digital display monitors should be conducted



    A
     
    Daily 


    B
     
    Weekly 


    C
     
    Monthly 


    D
     
    Annually
    • Image Upload 16
    •  
    • A
    •  
    • Daily
  17. Inadequate collimation in CR imaging can result in an image that is too

    1. light

    2. dark

    3. noisy





    A
     
    1 only 


    B
     
    1 and 2 only 


    C
     
    2 and 3 only 


    D
     
    1, 2, and 3
    • Image Upload 17
    •  
    • D
    •  
    • 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





    A
     
    1 only 


    B
     
    1 and 2 only 


    C
     
    1 and 3 only 


    D
     
    1, 2, and 3
    • Image Upload 18
    •  
    • D
    •  
    • 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?



    A
     
    The timer is inaccurate. 


    B
     
    The milliamperage station is inaccurate. 


    C
     
    One rectifier is malfunctioning. 


    D
     
    The test results are satisfactory.
    • Image Upload 19
    •  
    • D
    •  
    • The test results are satisfactory.
  20. Quality Control (QC) testing is used to evaluate digital display monitors in all of the following ways, except



    A
     
    Display luminance response 


    B
     
    Display resolution 


    C
     
    Display matrix size 


    D
     
    Display noise
    • Image Upload 20
    •  
    • C
    •  
    • Display matrix size
  21. In order to avoid background radiation artifacts when using CR, it is important to:



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


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


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


    D
     
    All of these are correct actions
    • Image Upload 21
    •  
    • D
    •  
    • 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?



    A
     
    The 1/12-second time station is inaccurate. 


    B
     
    The 200-mA station is inaccurate. 


    C
     
    A rectifier is not functioning. 


    D
     
    The processor needs servicing.
    • Image Upload 22
    •  
    • A
    •  
    • The 1/12-second time station is inaccurate.
Author
McCrae
ID
295642
Card Set
Equipment Operation and Quality Control I
Description
Rad Ready Review
Updated