Image Acquisitions Selection of technical factors 1

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McCrae
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296993
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Image Acquisitions Selection of technical factors 1
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2015-02-27 00:51:11
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Selection of technical factors
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  1. In an AP abdomen radiograph taken at 105-cm SID during an IVU series, one renal shadow measures 9 cm in width. If the OID is 18 cm, what is the actual width of the kidney?




     
    5 cm 



     
    7.5 cm 



     
    11 cm 



     
    18 cm
    •  
    •  
    • 7.5 cm 



  2. Which of the following will produce the greatest distortion?




     
    AP projection of the skull 



     
    PA projection of the skull 



     
    37° AP axial of the skull 



     
    20° PA axial of the skull
    •  
    •  
    • 37° AP axial of the skull
  3. Which of the following is most likely to result from the introduction of a grid to a particular radiographic examination?




     
    Increased patient dose and increased contrast 



     
    Decreased patient dose and decreased contrast 



     
    Increased patient dose and decreased contrast 



     
    Decreased patient dose and increased contrast
    •  
    •  
    • Increased patient dose and increased contrast
  4. Which of the following groups of exposure factors will produce the most radiographic density?




     
    100 mA, 50 ms 



     
    200 mA, 40 ms 



     
    400 mA, 70 ms 



     
    600 mA, 30 ms
    •  
    •  
    • 400 mA, 70 ms 
    • milliamperage × time = mAs,
  5. Which of the following pathologic conditions would require an increase in exposure factors?




     
    Pneumoperitoneum 



     
    Obstructed bowel 



     
    Renal colic 



     
    Ascites
    •  
    •  
    • Ascites
  6. Which of the following is likely to contribute to the radiographic contrast present on the finished radiograph?

    1. Atomic number of tissues radiographed

    2. Any pathologic processes

    3. Degree of muscle development






     
    1 and 2 only 



     
    1 and 3 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  7. Which of the following quantities of filtration is most likely to be used in mammography?




     
    0.5 mm Mo 



     
    1.5 mm Al 



     
    1.5 mm Cu 



     
    2.0 mm Cu
    •  
    •  
    • 0.5 mm Mo 
    • <correct.opt style="color: rgb(78, 78, 78); font-family: 'Open Sans'; font-size: 15px; line-height: 22.5px;">A Soft tissue radiography requires the use of long-wavelength, low-energy x-ray photons. Very little filtration is used in mammography. 
  8. If 92 kV and 12 mAs were used for a particular abdominal exposure with single-phase equipment, what mAs would be required to produce a similar radiograph with three-phase, six-pulse equipment?




     
    36 



     
    24 



     




     
    6
    •  
    •  
    • To produce similar density, only two thirds of the original mAs would be used for three-phase, six-pulse equipment (2/3 × 12 = 8 mAs). With 3-phase, 12-pulse equipment, the original mAs would be cut in half. 
  9. Which of the following terms is used to describe unsharp edges of tiny radiographic details?




     
    Diffusion 



     
    Mottle 



     
    Blur 



     
    Umbra
    •  
    •  
    • Blur
  10. _______ is a grainy appearance caused by fast imaging systems.
     Mottle
  11. Which of the following groups of exposure factors would be most appropriateto control involuntary motion?




     
    400 mA, 0.03 second 



     
    200 mA, 0.06 second 



     
    600 mA, 0.02 second 



     
    100 mA, 0.12 second
    •  
    •  
    • 600 mA, 0.02 second 
    • it is essential to use the shortest possible exposure time in order to have a “stop action” effect. 
  12. The microswitch for controlling the amount of replenishment used in an automatic processor is located at the




     
    receiving bin 



     
    crossover roller 



     
    entrance roller 



     
    replenishment pump
    •  
    •  
    • entrance roller
  13. Which one of the following is (are) used to control the production of scattered radiation?

    1. Collimators

    2. Optimal kV

    3. Use of grids






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  14. Which of the following terms/units is used to express the resolution of a diagnostic image?




     
    Line pairs per millimeter (lp/mm) 



     
    Speed 



     
    Latitude 



     
    Kiloelectronvolts (keV)
    •  
    •  
    • Line pairs per millimeter (lp/mm)
  15. In a PA projection of the chest being used for cardiac evaluation, the heart measures 15.2 cm between its widest points. If the magnification factor is known to be 1.3, what is the actual diameter of the heart?




     
    9.7 cm 



     
    11.7 cm 



     
    19.7 cm 



     
    20.3 cm
    •  
    •  
    • 11.7 cm
  16. Compared with slow-speed screens, high-speed screens are often used to

    1. minimize patient dose

    2. keep exposure time to a minimum

    3. image fine anatomic details






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 only
  17. However, because _______ are associated with more diffusion of fluorescent light, they produce less recorded detail and are not used to image structures requiring excellent recorded detail.
    high-speed screens 
  18. How is source-to-image distance (SID) related to exposure rate and radiographic density?




     
    As SID increases, exposure rate increases and radiographic density increases. 



     
    As SID increases, exposure rate increases and radiographic density decreases. 



     
    As SID increases, exposure rate decreases and radiographic density increases. 



     
    As SID increases, exposure rate decreases and radiographic density decreases.
    •  
    •  
    • As SID increases, exposure rate decreases and radiographic density decreases.
  19. Changes in milliampere-seconds can affect all the following except




     
    quantity of x-ray photons produced 



     
    exposure rate 



     
    optical density 



     
    recorded detail
    •  
    •  
    • recorded detail
  20. However, because they are associated with more diffusion of fluorescent light, they produce less recorded detail and are not used to image structures requiring excellent recorded detail.
  21. In radiography of a large abdomen, which of the following is (are) effective way(s) to minimize the amount of scattered radiation reaching the image receptor (IR)?

    1. Use of close collimation

    2. Use of low mAs

    3. Use of a low-ratio grid






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 only
  22.  excessive kilovoltage ________the production of scattered radiation.
    increases 
  23. The factors that control recorded detail include















    1. Focal spot size
    2. Type of rectification
    3. SID






     
    1 and 2 only 



     
    1 and 3 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 3 only
  24. A dry laser printer is generally used when it is necessary to print digital images on film. This laser film is loaded under the following conditions




     
    daylight 



     
    safelight with red filter 



     
    safelight with amber filter 



     
    total darkness
    •  
    •  
    • daylight
  25. An increase in kilovoltage will serve to




     
    produce a longer scale of contrast 



     
    produce a shorter scale of contrast 



     
    decrease the radiographic density 



     
    decrease the production of scattered radiation
    •  
    •  
    • produce a longer scale of contrast
  26. An exposure was made at a 36-in. SID using 12 mAs and 75 kVp with a 400-speed imaging system and an 8:1 grid. A second radiograph is requested with improved recorded detail. Which of the following groups of technical factors will best accomplish this task?




     
    15 mAs, 12:1 grid, 75 kVp, 400-speed system, 36-in. SID 



     
    15 mAs, 12:1 grid, 75 kVp, 400-speed system, 40-in. SID 



     
    30 mAs, 12:1 grid, 75 kVp, 200-speed system, 40-in. SID 



     
    12 mAs, 8:1 grid, 86 kVp, 200-speed system, 36-in. SID
    •  
    •  
    • 30 mAs, 12:1 grid, 75 kVp, 200-speed system, 40-in. SID
  27. The ____ The Speed System The Better The Recorded Detail
    Slower
  28. The attenuation of x-ray photons is not influenced by

    1. pathology

    2. effective atomic number

    3. photon quantity






     
    1 only 



     
    3 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 3 only

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