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Radiographic projection of objects

Radiographic projection of objects. Step wedge. Darkening curve of films. darkening. linear part. exposition. darkening. Sensitivity to grey spectrumof the eyes and radiographic films. human eyes. Rtg. film. dark. bright. Hermann grid illusion. Mach Band effect. Koffka ring.

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Radiographic projection of objects

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  1. Radiographic projection of objects

  2. Step wedge

  3. Darkening curve of films darkening linear part exposition

  4. darkening

  5. Sensitivity to grey spectrumof the eyes and radiographic films human eyes Rtg. film dark bright

  6. Hermann grid illusion

  7. Mach Band effect

  8. Koffka ring

  9. Koffka ring

  10. Role of the background

  11. Mach Band

  12. Mach Band

  13. Mach Band

  14. Mach Band

  15. Mach Band

  16. Mach Band

  17. Localization of defects

  18. Role of the background

  19. Projection of bone lesions

  20. Projection of bone lesions

  21. Localization of root apex

  22. Apical transparenties

  23. Apical transparenties

  24. Apical transparenties

  25. Apical transparenties

  26. „God is good to endodontists” • 90% of apical defects transparent • Mainly localised at the apex • Close to the cortical bone • Background usualy bright

  27. Disturbing factors • Inclination • Anatomic noise (anatomical landmarks) • Size (too small) • Expozition • Film development

  28. Anatomical landmarks/direction

  29. Facts affect to image quality sharpness contrast projection

  30. projection

  31. brightness-darkness

  32. Projection of periodontium

  33. Periodontium

  34. Projection in the horizontal plain distal orthoradial mesial

  35. Buccal object rule Same Lingual Opposite Buccal

  36. Parallaxis

  37. Lokalized CT (CBCT)

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