Image Acquisition and Evaluation

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Author:
McCrae
ID:
296995
Filename:
Image Acquisition and Evaluation
Updated:
2015-02-27 01:29:52
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rad
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Description:
Criteria for image evaluation
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  1. Which of the following factors influence(s) the production of scattered radiation?

    1. Kilovoltage level

    2. Tissue density

    3. Size of field






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  2. Which of the following will have an effect on radiographic contrast?















    1. Beam restriction
    2. Grids
    3. Focal spot size






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  3. . Since the function of grids is to collect scattered radiation before they hit the IR, they serve to ____ the scale of contrast. 
    shorten
  4. Which of the following affects both radiographic density and intensifying screen speed?

    1. Thickness of phosphor layer

    2. Type of phosphors used

    3. Thickness of spongy screen support






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  5. Which of the following is (are) essential to high-quality mammographic examinations?

    1. Small-focal-spot x-ray tube

    2. Short-scale contrast

    3. Use of a compression device






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  6. Which of the following artifacts is occasionally associated with the use of grids in digital imaging?




     
    Incomplete erasure 



     
    Aliasing 



     
    Image fading 



     
    Vignetting
    •  
    •  
    • Aliasing
  7. An artifact associated with digital imaging and grids is “aliasing” or the “_____ effect.”
    moiré
  8. If a lateral projection of the chest is being performed on an asthenic patient and the outer photocells are selected, what is likely to be the outcome?




     
    Decreased density 



     
    Increased density 



     
    Scattered radiation fog 



     
    Motion blur
    •  
    •  
    • Decreased density
  9. Geometric unsharpness will be least obvious

    1. at long SIDs.

    2. with small focal spots.

    3. at the anode end of the image.






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  10. For which of the following examinations can the anode heel effect be an important consideration?

    1. Lateral thoracic spine

    2. AP femur

    3. Right anterior oblique (RAO) sternum






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  11. Which type of error results in grid cutoff at the periphery of the radiographic image?




     
    Off-focus 



     
    Off-center 



     
    Off-level 



     
    Off-angle
    a
  12. If the radiographer is unable to achieve a short OID because of the structure of the body part or patient condition, which of the following adjustments can be made to minimize magnification distortion?




     
    A smaller focal-spot size should be used. 



     
    A longer SID should be used. 



     
    Faster intensifying screens should be used. 



     
    A lower-ratio grid should be used.
    •  
    •  
    • A longer SID should be used.
  13. Which of the following conditions will require an increase in x-ray photon energy/penetration?




     
    Fibrosarcoma 



     
    Osteomalacia 



     
    Paralytic ileus 



     
    Ascites
    •  
    •  
    • Ascites
  14. Which of the following can be used to determine the sensitivity of a particular film emulsion?




     
    Sensitometric curve 



     
    Dose–response curve 



     
    Reciprocity law 



     
    Inverse-square law
    •  
    •  
    • Sensitometric curve
  15. ________ curve is used in radiation protection and illustrates the quantity of dose required to produce a particular effect.
    Adose–response
  16. The _______ law states that a particular milliampere-seconds value, regardless of the combination of milliamperage and time, should produce the same degree of blackening.
    reciprocity
  17. The _________ law illustrates the relationship between distance and radiation intensity.
    inverse-square
  18. What is likely to result from using single-emulsion film in an IR that has two intensifying screens?




     
    Double exposure 



     
    Decreased density 



     
    Increased recorded detail 



     
    Greater latitude
    •  
    •  
    • Decreased density
  19. Misalignment of the tube–part–IR relationship results in




     
    shape distortion 



     
    size distortion 



     
    magnification 



     
    blur
    •  
    •  
    • shape distortion
  20. Size distortion, or magnification, is caused by too great an ____or too short an ____.
    OID

     SID
  21. _______is caused by the use of a large focal spot. 
    Focal-spot blur 
  22. A positive contrast agent

    1. absorbs x-ray photons

    2. results in a dark area on the radiograph

    3. is composed of elements having low atomic number






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 only
  23. <correct.opt style="color: rgb(78, 78, 78); font-family: 'Open Sans'; font-size: 15px; line-height: 22.5px;">A Radiopaque contrast agents appear white on the finished image because many x-ray photons are absorbed. These are referred to______contrast agents—composed of dense (i.e., high atomic number) material through which x-rays will not pass easily.
     positive 
  24. If a radiograph were made of an average-size knee using automatic exposure control (AEC) and all three photocells were selected, the resulting radiograph would demonstrate




     
    excessive density. 



     
    insufficient density. 



     
    poor detail. 



     
    adequate exposure.
    •  
    •  
    • insufficient density.

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