Рентгенология & Радиология, 2019, LVIII 287-293

Application of manual and automatic segmentation methods for volumetric measurements of osteolytic periapical lesions

  1. Karteva, N. Manchorova-Veleva, E. Karteva, P. Kanazirska,D. Keskinova3, G. Jordanov, S. Vladimirov

Abstract.

Digital volume tomography (DVT) is widely used in the field of dental medicine. In endodontics it provides detailed information on the anatomy of the root canal system and efficient and precise measurement of chronic periapical lesions’ (CPLs) volume. The aim of this study was to investigate the reliability of two methods of volume determination on DVT scans from patients with CPLs. Volume and border characteristics of 249 CPLs were evaluated by two independent calibrated examiners. The DVT scans were provided by a radiology laboratory based in Plovdiv, Bulgaria. Two methods of volume determination were compared – manual and automatic segmentation. A strong positive correlation between the volumes determined by manual and automatic segmentation was established (r=0.936, P=0.000 и r=0.936, P=0.000). The distribution of lesion borders is as follows: 27.7% localized, 14.1% diffuse, 58.2% combined. The overall reliability for the segmentation methods between the examiners was excellent. The automatic segmentation technique showed slightly higher consistency. However, both methods yielded poor reliability estimates for the volume determination of lesions with diffuse borders (κ=0.395, κ=0.385). Our study confirms previous reports on the high reliability of the automatic methods for segmentation and volume determination in DVT scans. Their efficiency and usability of the method is essential for its future implementation in clinical practice and post-root canal treatment follow-up.

Key words: DVT. CBCT. PERIAPICAL LESIONS