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RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY   L 8: Factors affecting image quality IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]
Topics ,[object Object],[object Object],[object Object],[object Object],[object Object]
Overview ,[object Object]
Part 8: Image quality Topic 1: Basic Image Quality Evaluators IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Imaging quality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Factors affecting image quality Image quality Contrast Distortion  & artifact Noise Blur or  Unsharpness
Image quality evaluators/descriptors NOISE RESOLUTION CONTRAST Wiener spectra Modulation transfer  Function MTF Signal-to-noise Ratio S/N Contrast detail  analysis Rose model ROC analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Part 8: Image quality Topic 2: Image contrast IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Image contrast Low Contrast Medium  Contrast High Contrast Image contrast refers to the fractional difference in optical density of brightness between two regions of an image
Some factors influencing contrast ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Technique factors (1)
Technique factors (2) ,[object Object],[object Object],[object Object],[object Object]
X Ray penetration in human tissues 60 kV - 50 mAs 70 kV - 50 mAs 80 kV - 50 mAs
X Ray penetration in human tissues Improvement of image contrast  (lung)
Technique factors (3) ,[object Object],[object Object],[object Object],[object Object]
X Ray penetration in human tissues 70 kV - 25 mAs 70 kV - 50 mAs 70 kV - 80 mAs
Receptor contrast ,[object Object],[object Object],[object Object],[object Object]
Video monitor ,[object Object],[object Object],[object Object],[object Object]
Contrast agents ,[object Object],[object Object],[object Object]
Part 8: Image quality Topic 3: Blur or lack of sharpness IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Blur or lack of sharpness ,[object Object],[object Object],[object Object]
Resolution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Factors affecting image sharpness Image  Unsharpness Geometric Unsharpness Subject  Unsharpness Motion  Unsharpness Subject  Unsharpness
Geometric blur  ,[object Object],[object Object],Small focal spot Large focal spot
Geometric blur  ,[object Object],[object Object],[object Object]
Lack of sharpness in the subject  ,[object Object],[object Object],[object Object],[object Object]
Lack of sharpness due to motion (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lack of sharpness due to motion (2) ,[object Object],[object Object],[object Object],[object Object]
Lack of receptor sharpness ,[object Object],[object Object],[object Object],[object Object]
Part 8: Image quality Topic 4: Distortion and artifacts IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Distortion and artifacts ,[object Object],[object Object],[object Object],[object Object],[object Object]
Distortion and artifacts
Distortion and artifacts
Part 8: Image quality Topic 5: Image noise IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
Noise ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Noise in film ,[object Object]
Image noise ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary ,[object Object],[object Object]
Where to Get More Information ,[object Object],[object Object],[object Object]

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L08 Image Quality

  • 1. RADIATION PROTECTION IN DIAGNOSTIC AND INTERVENTIONAL RADIOLOGY L 8: Factors affecting image quality IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
  • 2.
  • 3.
  • 4.
  • 5. Part 8: Image quality Topic 1: Basic Image Quality Evaluators IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
  • 6.
  • 7. Factors affecting image quality Image quality Contrast Distortion & artifact Noise Blur or Unsharpness
  • 8.
  • 9. Part 8: Image quality Topic 2: Image contrast IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
  • 10. Image contrast Low Contrast Medium Contrast High Contrast Image contrast refers to the fractional difference in optical density of brightness between two regions of an image
  • 11.
  • 12.
  • 13.
  • 14. X Ray penetration in human tissues 60 kV - 50 mAs 70 kV - 50 mAs 80 kV - 50 mAs
  • 15. X Ray penetration in human tissues Improvement of image contrast (lung)
  • 16.
  • 17. X Ray penetration in human tissues 70 kV - 25 mAs 70 kV - 50 mAs 70 kV - 80 mAs
  • 18.
  • 19.
  • 20.
  • 21. Part 8: Image quality Topic 3: Blur or lack of sharpness IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
  • 22.
  • 23.
  • 24. Factors affecting image sharpness Image Unsharpness Geometric Unsharpness Subject Unsharpness Motion Unsharpness Subject Unsharpness
  • 25.
  • 26.
  • 27.
  • 28.
  • 29.
  • 30.
  • 31. Part 8: Image quality Topic 4: Distortion and artifacts IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
  • 32.
  • 35. Part 8: Image quality Topic 5: Image noise IAEA Training Material on Radiation Protection in Diagnostic and Interventional Radiology
  • 36.
  • 37.
  • 38.
  • 39.
  • 40.