Card Set Information

2011-01-20 22:29:53
CBC Radiology

Accuracy and QC Equipment
Show Answers:

  1. Wire mesh test is used to test what?
    contact between the screen and film
  2. Light field and x-ray beam accuracy allowance?
    +\- 2% of SID
  3. Central ray allowance?
  4. Distance indicator allowance?
    +\- 10%
  5. Centering indicator allowance?
    +\- 10%
  6. Tube angle allowance?
    +\- 1%
  7. Timer accuracy single phase, method used?
    +\- 5%, spin top test
  8. Timer accuracy three phase, method used?
    +\- 5%, syncronized motorized spin test
  9. mA stations should be between _________ of actual mA selected.
    +\- 10%
  10. Actual settings between high and low mA stations may not be more than?
    +\- 10%
  11. The Wisconsin test cassette was used to test what?
  12. Computerized dosimeters mesure kVp accuracy which may not be more/less than?
    +\- 5%
  13. The half-value layer determines the amount of _______ that will reduce beam intensity to _________________.
    filtration, 1/2 it's original value. "Beam quality"
  14. Exposure reproducibility (mAs) uses computerized dosimeters to detect values that should not be more/less tahn?
    +\- 5%
  15. Exposure rates for fluoroscopic systems shall not be more than?
    2.1 R/min per mA station, or 10R/min maximum
  16. Bright vision is best when the light wavelength is _____nm and dim vision is best at _____nm.
    555, 505
  17. The basic unit of photometrometry is scalled to the maximum photopic eye response at ____nm and is called the ________?
    555, lumen
  18. Luminous Flux describes the total intensity of ____________.
    light from a source.
  19. Illuminance describes the intensity of light incident _______.
    on a surface
  20. Luminance intensity is a property of the source of light such as a ________ or a ___________.
    view box, digital display device
  21. Laws of Illumination?
    Inverse square law, Cosine Law
  22. What is the inverse square law, and formula?
    • strength is inversely proportional to the square of the distance from the source
    • I1/I2 = D2/D1
    • Where:
    • I1=Intensity at D1
    • I2=Intensity at D2
    • D1=Distance 1 D2=Distance 2
  23. Cosine Law?
    viewing angle: farther off square (90degrees) the dimmer and less quality an image has.
  24. CRT? AMLCD?
    • Cathode ray tube
    • active matrix liquid crystal display
  25. ______ resolution improves with the use of higher megapixel display devices.
    Spatial: more pixels (in smaller array)= better resolution
  26. SMPTE? Approved by?
    Society of Motion Picture and Television Engineers, ACR- American College of Radiology
  27. ACR stands for?
    American College of Radiology
    National Electrical Manufactureers Association- Digital Imaging and Communication
  29. VESA?
    Video Electronics Standard Association
  30. FPDM?
    Flat Panel Display Measurement
  31. AAPM TG 18?
    American Association of Physicist in Medicine, task group 18
  32. Luminance Meter: Near Range? Telescopic?
    • Near-meter on monitor
    • Telescopic- meter is one meter from monitor
  33. Geometric distortion: Barrel distortion? Pincushion distortion?
    Barrel- normally straight lines bow outward, Pincushion- normally straight lines bow inward
  34. Reflection: Specular? Diffuse?
    Specular- bright shiny reflection, diffuse- dim reflection
  35. Luminance response uses test TG 18- ____, or ____, or ____.
    TG 18-CT, TG 18-UN, TG 18-UNL
  36. Display Resolution uses test TG 18 ____ or _______.
    TG 18-CX or TG 18-QC
  37. Resolution Uniformity uses test TG 18 ______?
    TG 18-PX