aquisition

Card Set Information

Author:
Anonymous
ID:
297318
Filename:
aquisition
Updated:
2015-03-02 15:36:55
Tags:
rad
Folders:

Description:
rad review
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user Anonymous on FreezingBlue Flashcards. What would you like to do?


  1. Factors that contribute to film fog include

    1. the age of the film

    2. excessive exposure to safelight

    3. processor chemistry






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  2. A film emulsion having wide latitude is likely to exhibit




     
    high density 



     
    low density 



     
    high contrast 



     
    low contrast
    •  
    •  
    • low contrast
  3.  A gentle curve (as opposed to a steep curve) usually indicates a film with _____speed, low contrast, and more latitude.
    slow 
  4. In order for a phosphor to be suitable for use in intensifying screens, it should have which of the following characteristics?

    1. High conversion efficiency

    2. High x-ray absorption

    3. High atomic number






     
    1 only 



     
    3 only 



     
    1 and 2 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  5. The device shown in Figure 4–16 is used for




    Courtesy of Gammex Inc.






     
    tomographic QA testing 



     
    timer and rectifier testing 



     
    mammographic QA testing 



     
    kilovoltage calibration testing
    •  
    •  
    • mammographic QA testing
  6. The instrument that is used frequently in quality-control programs to measure varying degrees of x-ray exposure is the




     
    aluminum step wedge. 



     
    spinning top. 



     
    densitometer. 



     
    sensitometer.
    •  
    •  
    • densitometer.
  7. Every radiographic image is composed of a number of different densities. These densities may be measured and given a numeric value with a device called a _______
    densitometer.
  8. ________ is another device used in QA programs; it is used to give a precise exposure to a film emulsion.
    sensitometer
  9. An ______ (penetrometer) may be used to show the effect of kilovoltage on contrast. 
    aluminum step wedge
  10. ______ is used to test the accuracy of the x-ray machine's timer or rectifiers.
    spinning top
  11. Characteristics of DR imaging include

    1. solid-state detector receptor plates

    2. a direct-capture imaging system

    3. immediate image display






     
    1 only 



     
    1 and 3 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    • 1, 2, and 3
  12. Which of the following can cause poor screen–film contact?

    1. Damaged IR frame

    2. Foreign body in IR

    3. Warped IR front






     
    1 only 



     
    2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  13. All of the following are potential digital pre-processing problems, except:




     
    Edge enhancement 



     
    Defective pixel 



     
    Image lag 



     
    Line noise
    Edge enhancement 
  14. What determines the quantity of fluorescent light emitted from a fluorescent screen?

    1. Thickness of the phosphor layer

    2. Type of phosphor used

    3. Phosphor size






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    • 1, 2, and 3
  15. The luminescent light emitted by the PSP is transformed into the image seen on the CRT by the




     
    PSP 



     
    scanner–reader 



     
    ADC 



     
    helium–neon laser
    •  
    • ADC
  16. Which of the following digital post-processing methods remove high-frequency noise from the image?




     
    Edge enhancement 



     
    Windowing 



     
    Smoothing 



     
    Aliasing
    •  
    •  
    • Smoothing
  17. _____) is a type of post-processing image manipulation, which can be effective for enhancing fractures and small, high-contrast tissues.
    Edge enhancement 
  18. _______ is achieved when fewer neighboring pixels are included in the signal average. 
    Edge enhancement
  19. ______ is a post-processing method of adjusting the brightness and contrast in the digital image. 
    Windowing 
  20. All of the following are factors that cause low contrast in CR images, except:




     
    High kVp 



     
    Inadequate grid efficiency or no grid 



     
    Excessive beam limiting (collimation) 



     
    Incomplete erasure of the image plate
    •  
    •  
    • Excessive beam limiting (collimation)
  21. Which of the following statements regarding dual x-ray absorptiometry is (are) true?

    1. Radiation dose is low.

    2. Only low-energy photons are used.

    3. Photon attenuation by bone is calculated.






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 3 only
  22. The relationship between the intensity of light striking a film and the intensity of light transmitted through the film is an expression of which of the following?




     
    Radiographic contrast 



     
    Radiographic density 



     
    Recorded detail 



     
    Radiographic filtration
    •  
    • Radiographic density
  23. Sampling frequency in computed radiography (CR) is expressed as:




     
    The TFT array size 



     
    An inverse relationship between focal spot size and matrix size 



     
    The light spread between the image plate and the light guide of the scanner 



     
    Pixels/mm or pixel density
    •  
    •  
    • Pixels/mm or pixel density
  24. Resolution in CR increases as

    1. laser beam size decreases

    2. monitor matrix size decreases

    3. PSP crystal size decreases






     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 3 only
  25. Silver reclamation may be accomplished in which of the following ways?

    1. Metallic replacement cartridge

    2. Electrolytic plating unit

    3. Removal from used film






     
    1 only 



     
    2 only 



     
    1 and 2 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  26. Unexposed, undeveloped silver is removed from film emulsion in the_____solution. 
     fixer 
  27. Which of the following can affect histogram appearance?

    1. Centering accuracy

    2. Positioning accuracy

    3. Processing algorithm accuracy






     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    • 1, 2, and 3
  28. Which of the following is (are) tested as part of a quality assurance (QA) 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 

What would you like to do?

Home > Flashcards > Print Preview