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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 8  »  Image processing for enhanced observer agreement in the evaluation of periapical bone changes
Image processing for enhanced observer agreement in the evaluation of periapical bone changes
Results.



Examples of the images obtained are shown in Figs 1 and 2.

Figure 1. (a) Periapical radiograph immediately postoperatively and recall radiograph at 3 months. (b) Corresponding subtraction image.
The colour-converted region of interest demonstrates the increase in density over 3 months projected on top of the radiograph obtained immediately postoperatively.

Periapical radiograph immediately postoperatively and recall radiograph at 3 months
Corresponding subtraction image

Figure 2. (a) Periapical radiograph at 3 months and recall radiograph at 12 months. (b) Corresponding subtraction image.
The colour converted region of interest demonstrates the increase in density over 12 months projected on top of the radiograph obtained at the 3 months recall.

Periapical radiograph at 3 months and recall radiograph at 12 months

The colour converted region of interest demonstrates the increase in density over 12 months projected on top of the radiograph obtained at the 3 months recall

Figure 3. The inter- and intra-examiner agreement rates expressed as kappa values.

The inter- and intra-examiner agreement rates expressed as kappa values

Inter-examiner agreement.
Figure 3s hows the results of the inter-examiner agreement. The agreement between the examiners when digital radiographic images where evaluated was statistically significantly higher compared with conventional radiographs (kappa value for digital radiographic images 0.89 x 0.05; for conventional radiographs 0.25 x0.03; P = 0.001 by Mann-Whitney U-test).

Intra-examiner agreement.
Figure 3 right shows the intra-examiner agreement. Digital interpretation showed statistically significantly better results than conventional radiographs (kappa value for digital radiographic images 0.83 x0.13; for conventional radiographs 0.32x0.11; P = 0.02 by Mann-Whittney U-test).