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Published byMagnus Cobb Modified over 9 years ago
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Radiographic projection of objects
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Step wedge
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Darkening curve of films exposition darkening linear part
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darkening
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darkbright human eyes Rtg. film Sensitivity to grey spectrumof the eyes and radiographic films
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Hermann grid illusion
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Mach Band effect
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Koffka ring
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Role of the background
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Mach Band
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Localization of defects
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Role of the background
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Projection of bone lesions
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Localization of root apex
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Apical transparenties
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„God is good to endodontists” 90% of apical defects transparent Mainly localised at the apex Close to the cortical bone Background usualy bright
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Disturbing factors Inclination Anatomic noise (anatomical landmarks) Size (too small) Expozition Film development
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Anatomical landmarks/direction
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Facts affect to image quality sharpness contrast projection
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brightness-darkness
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Projection of periodontium
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Periodontium
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Projection in the horizontal plain mesial distal orthoradial
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Buccal object rule S ame L ingual O pposite B uccal
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Parallaxis
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Lokalized CT (CBCT)
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