Neil's Quiz 2

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Neil's Quiz 2
2011-02-20 20:14:30
CBC Radiology Quality Assurance

Stuff for quiz 2
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  1. Photopic (bright light) vision uses ____ of the eye.
  2. Scotopic (dim light) vision uses _____ of the eye.
  3. Photopic (bright) vision is best when the light wavelength is _____ nm and Scotopic (dim) vision is best at _____ nm.
    • 555
    • 505
  4. The basic unit of photometrometry is scaled to the maximum photopic eye response at _____ nm and is called the _____.
    • 555
    • Lumen
  5. Luminous Flux?
    fundamental unit of photometry, expressed in Lumens, describes the total intensity of light from a source.
  6. Iluminance?
    Describes the intensity of light incident on a surface
  7. The metric equivalent of one lumen per square meter is called?
    one lux
  8. Luminance Intensity?
    is a property of the source of light, such as a view box or a digital display devise.
  9. The best viewing of a digital display device is?
    straight on
  10. AMLCD?
    active matrix liquid crystal display
  11. SMPTE?
    • The Society of Motion Picture and Television Engineers
    • They describe the format, dimensions and contrast characteristics of the video test pattern- Approved by the American College of Radiology (ACR)
  12. NEMA - DICOM
    The ACR and the National Electrical Manufactures Association (NEMA) formed a committee to generate the standard for Digital Imaging and Communication (DICOM). they came up with DICOM standards.
  13. VESA
    Video Electronics Standard Association (VESA) In 1998 VESA released the Flat Panel Display Measurement standard (FPDM) version one
  14. AAPM TG 18
    American Association of Physicists in Medicine (AAPM) developed a set of test patterns and outlined related procedures in Task Group Report 18, to evaluate a digital display device comprehensively toward the goal of ensuring acceptable clinical performance,
  15. Two types of luminance photometers commonly used?
    • near-range (on the screen)
    • telescopic (test from a distance of 1 meter)
    • Measure liminance response and uniformity
  16. FPDM?
    Flat panel display measurement
  17. Geometric Distortion?
    • Measure displayed image in regards the actual item.
    • Barrel distortion- lines bow out
    • Pincushion distortion- lines bow in
  18. Specular Reflection vs Diffuse Reflection
    • Specular- reflections of light sources sourrounding the the monitor.
    • Diffuse- light is randomly scattered, see dimer reflections
  19. TG 18-QC is a test pattern for?
    Geometric Distortion, is also used for resolution
  20. Antireflective coatings help reduce ______ reflection.
  21. TG 18-AD is a test pattern for evaluating?
    diffuse reflection
  22. What simple test is used to assess specular reflextion?
    turn the monitor off and look for sources of reflective light illumination on the screen
  23. TG 18-CT, 18-UN, 18-UNL test pattern is used to perform?
    luminance response evaluation
  24. Display Resoultion: Spatial resolution is the quantitative measurement of the ability of the display system to produce separable images of different points of an object with high fidelity. Uses what test pattern?
    TG 18-CX or TG 18-QC
  25. TG 18-CX or TG 18-QC is used to test?
    Display Resolution
  26. TG 18-AFC test pattern is used to test?
    Display noise
  27. The TG 18-QC test pattern should be viewed how often?
    Daily. Test for resolution.
  28. What test is used to evaluate resoultion uniformity?
    TG 18-PX
  29. TG 18-PX is used to evaluate what?
    resolution uniformity
  30. The illuminance meter (not luminance) is used to evaluate?
    monitor display reflection and ambient light conditions