Kats Final Test3

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MYKE
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271724
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Kats Final Test3
Updated:
2014-04-24 23:06:54
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Kats Final Chapter 10 pt2
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Kats Final Chapter 10 pt2
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  1. High spatial resolution and high contrast resolution require_____ noise and slow image receptors.  .
    1) low
    2)high
    low
  2. Higher______ density reduces the contrast of the radiographic image.
    fog
  3. What term is used to define the proper quantity for expressing image intensification.
    conversion factor
  4. a thin metal layer of cesium and antimony
    The photocathode
  5. In fluoroscopy, what provides better spatail resolution, better contrast resolution but at a higher patient dose.
    magnification mode
  6. Why is pulse progressive fluoroscopy necessary in digital fluoroscopy?
    a.  digital fluoroscopy is opereated in radiographic mode
    b. to prevent thermal over loading 
    c. to reduce patient dose
    a and b only
     b and c only
    c only
    a and c
    a,b,and c
    a b c
  7. The light intensity produced at the output phosphor compared to the light produced at the input phosphor is
    increased by 50 to 75 times
  8. On the television monitor, a bright spot is the result of 
    a. a brighter fluorescence of the phosphor due to a greater number of electrons leaving the electron gun
    b. an increased video signal strength from the camera tube
    c. an increased intensity of light reaching the camera tube from the output phosphor of the image intensifier
    a
    a and b
    c  
    a, b and c
    a b c
  9. The output phosphor is 
    a)the same size as the input phosphor
    b)larger then the input phosphor 
    c)smaller then the input phosphor
    c
  10.  what is a
    anode
  11.  what is B
    electrostatic Lenses
  12.  what is C
    input phosphor
  13.  what is D
    photocathode
  14. Conversion from remnant x-ray photons to light photons occurs @ __________ ?
    C
  15. Where is the electron beam focused?

    B
  16. Where are photo-electrons converted to visible light
    A
  17. As it pertains to digital radiography_______________ releases photo-electrons when struck by light photons and _________ releases light when struck by photo-electrons.

    A)photocathode
    input phosphor 

    B)photocathode
    output phosphor

    C)input phosphor
    output phosophr 

    D)output phoshor
    input phoshor
    B
  18. The ability to digitally record a small object, its accuracy and clarity is the definition of which of the following?
    A)Recorded detail
    B)Spatial resolution
    C)Definition
    D)Detail
    B
  19. A decrease in the SNR will result in all of the following except:
    A)Increased “fog” to the image
    B)Reduced image quality
    C)Less signal strength in the image
    D)Improved image quality
    D
  20. All are advantages of television image monitoring of fluoroscopy except:
    A)Multiple persons can view the image simultaneously
    B)Electronic control of brightness level and contrast
    C)Electronic image storage for later playback and image manipulation
    D)Provides optimum spatial resolution
    D
  21. All of the following are advantages of flat panel image receptors except:

    A)They are affected by external magnetic fields
    B)There is no decrease in image quality around the image periphery
    C)Distortion-free images
    D)Improved contrast resolution over the entire image
    A
  22. How is the television image formed during fluoroscopy?
    A)By transforming the photoelectrons from the photocathode of the Image Intensifier into x-ray photons
    B)By transforming the remnant x-rays from the patient into a visible light image
    c)By transforming the remnant x-rays from the patient into an electron beam
    D) By transforming the visible light image of the Image Intensifie tube’s output phosphor into an electrical video signal
    D
  23. Which component of the digital fluoroscopy system converts the acquired electrical signals into a recognizable digital form for the display device?
    A) ADC
    B)DAC
    C)Image intensifier
    D)Flat panel image display
    A
  24. Which portion of the image intensifier tube receives the remnant radiation from the patient?
    A)Vidicon tube
    B)Electrostatic lenses 
    C)Input phosphor
    D)Output phosphor
    C
  25. Which term is defined as the ratio of the number of light photons at the output phosphor to the number of x-rays at the input phosphor?
    A)Brightness gain
    B)Flux gain
    C)Minification gain
    D)Magnification gain
    B
  26. Automatic brightness control is designed to compenstate for changes in 
    A)examination time  
    B)patient composition
    C)patient dose
    D)technique selection
    B
  27. When the maginification mode is operated 
    A)a larger area of the input phosphor is used
    B)patient dose is lowered
    C)the electron focal point is closed to the input phosphor
    D)the electron focal point is father away from the input phosphor
    C
  28. What camera tube is most often used 
    A)Dolby
    B)HD
    C)cesium iodide
    D)vidicon
    D
  29. During digital fluoroscpy, the image receptor is the
    A)film  
    B)image intensifier tube
    C)TV camera tube
    D)video monitor
    B
  30. The sensitive input surface of the television camear tube is smaller than the output phosphor of the image intensifer tube.
    True or False
    false

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