410 likes | 1.04k Views
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.
E N D
Darkening curve of films darkening linear part exposition
Sensitivity to grey spectrumof the eyes and radiographic films human eyes Rtg. film dark bright
„God is good to endodontists” • 90% of apical defects transparent • Mainly localised at the apex • Close to the cortical bone • Background usualy bright
Disturbing factors • Inclination • Anatomic noise (anatomical landmarks) • Size (too small) • Expozition • Film development
Facts affect to image quality sharpness contrast projection
Projection in the horizontal plain distal orthoradial mesial
Buccal object rule Same Lingual Opposite Buccal