1

Card Set Information

Author:
McCrae
ID:
296998
Filename:
1
Updated:
2015-03-01 15:36:20
Tags:
Aquisitions
Folders:

Description:
1
Show Answers:

Home > Flashcards > Print Preview

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


  1. A radiograph exposed using a 12:1 ratio grid may exhibit a loss of density at its lateral edges because the




     
    SID was too great. 



     
    grid failed to move during the exposure. 



     
    x-ray tube was angled in the direction of the lead strips. 



     
    CR was off-center.
    •  
    •  
    • SID was too great.
  2. If the quantity of black metallic silver on a particular x-ray film is such that it allows 1% of the illuminator light to pass through the film, that film has a density of




     
    0.1 



     
    1.0 



     
    2.0 



     
    3.0
    •  
    •  
    • 2.0
  3. _______ occurs when an intensifying screen absorbs x-ray photon energy, emits light, and thenceases to emit light as soon as the energizing source ceases.
    Fluorescence
  4. ________ occurs when an intensifying screen absorbs x-ray photon energy, emits light, and continues to emit light for a short time after the energizing source ceases. 
    Phosphorescence
  5. ______ is the freckle-like appearance on some radiographs made using a very fast imaging system. The brightness of a fluoroscopic image is amplified throughimage intensification.
    Quantum mottle
  6. Recorded detail is unaffected by changes in ___
    kilovoltage.
  7. As the exposed film enters the processor from the feed tray, it first enters the _______ section 
    developer
  8. the developer section is where exposed _________crystals are reduced to black metallic silver.
    silver bromide 
  9. Put theses in correct order
    wash section
     dryer section 
     the processor
     the fixer
    • the processor
    •  the fixer
    • wash section
    •  dryer section 
  10. IRs/cassettes frequently have a lead-foil layer behind the rear screen that functions to
    absorb backscatter
  11. The term windowing describes the practice of
    •  
    •  
    • changing the image contrast and/or density
  12. A graphic diagram of signal values representing various densities within the part being imaged is called a
    Histogram
  13. Unopened boxes of radiographic film should be stored away from radiation and
    •  
    • in the vertical position
  14.  where the unexposed silver grains are removed from the film by the clearing agent.
     the fixer(2),
  15. Base-plus fog is a result of

    1. blue-tinted film base



    1. chemical development



    1. the manufacturing process







     
    1 only 



     
    1 and 2 only 



     
    1 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1, 2, and 3
  16. Every film emulsion has a particular base-plus fog, which should not exceed ____

    0.2. 
  17. Every film emulsion has a particular base-plus fog, which should not exceed ____
    •  
    •  
    • crossover rollers
  18. _____ also called deflector plates, serve to keep the film on its proper course by directing or guiding it around corners. 
    Guide shoes,
  19. The _______ are located at the top of the processor, out of the solution, and direct the film from one solution tank to the next.
    crossover rollers
  20. An important feature of the pixel in a flat-panel TFT digital detector active matrix array is the:
    •  
    • Fill factor
  21. The _____ (B) is defined as the ratio of the sensing area of the pixel to the area of the pixel itself. The sensing area of the pixel receives the data from the layer above it, which captures X-rays that are subsequently converted to light (indirect flat-panel detectors) or electrical charges (direct flat-panel detectors)
    fill factor
  22. During measurement of blood pressure, which of the following occurs as the radiographer controls arterial tension with the sphygmomanometer?
    •  
    • The brachial artery is temporarily collapsed.
  23. In digital imaging, the maximum spatial resolution is equal to:




     
    The Nyquist frequency, which is 1/2X the pixel pitch (mm) 



     
    The wavelength of the detector system’s analog-to-digital convertor’s electrical signal 



     
    The distance between the silver halide crystals in the image receptor 



     
    The detective quantum efficiency of the imaging system; this should be at least 2X the frequency of the analog-to-digital convertor electrical signal
    •  
    •  
    • The Nyquist frequency, which is 1/2X the pixel pitch (mm)
  24. Phosphors suitable for use in intensifying screens should have which of the following characteristics?

    1. High conversion efficiency



    1. High x-ray absorption



    1. Afterglow







     
    1 only 



     
    1 and 2 only 



     
    3 only 
    •  
    • 1 and 2 only
  25. Cassetteless digital systems have a fixed spatial resolution determined by:




     
    The image plate laser divergence 



     
    The focal spot size used 



     
    The thin film transistor (TFT) detector element (DEL) size 



     
    The proximity of the phosphor screen crystals
    •  
    •  
    • The thin film transistor (TFT) detector element (DEL) size
  26. A film emerging from the automatic processor exhibits excessive density. This might be attributable to the following

    1. Developer temperature too high



    1. Chemical fog



    1. Underreplenishment







     
    1 only 



     
    1 and 2 only 



     
    2 and 3 only 



     
    1, 2, and 3
    •  
    •  
    • 1 and 2 onl
  27. In digital image subtraction, the pixel values from post-contrast images are electronically subtracted from pixel values from the first pre-contrast is called_____
     to show contrast-filled blood vessels with the other structures (e.g., bone) removed in order to enhance the diagnostic impressions of the radiologist.
    (mask) image
  28. The purpose of the automatic processor's transport system is to




     
    monitor and adjust temperature 



     
    agitate, mix, and filter solutions 



     
    move the film and change its direction 



     
    monitor the solution and replace it as necessary
    •  
    •  
    • move the film and change its direction

What would you like to do?

Home > Flashcards > Print Preview