Convolutional neural network-based automated maxillary alveolar bone segmentation on cone-beam computed tomography images

ObjectivesTo develop and assess the performance of a novel artificial intelligence (AI)-driven convolutional neural network (CNN)-based tool for automated three-dimensional (3D) maxillary alveolar bone segmentation on cone-beam computed tomography (CBCT) images. Materials and MethodsA total of 141 CBCT scans were collected for performing training (n = 99), validation (n = 12), and testing (n = 30) of the CNN model for automated segmentation of the maxillary alveolar bone and its crestal contour. Following automated segmentation, the 3D models with under- or overestimated segmentations were refined by an expert for generating a refined-AI (R-AI) segmentation. The overall performance of CNN model was assessed. Also, 30% of the testing sample was randomly selected and manually segmented to compare the accuracy of AI and manual segmentation. Additionally, the time required to generate a 3D model was recorded in seconds (s). ResultsThe accuracy metrics of automated segmentation showed an excellent range of values for all accuracy metrics. However, the manual method (95% HD: 0.20 +/- 0.05 mm; IoU: 95% +/- 3.0; DSC: 97% +/- 2.0) showed slightly better performance than the AI segmentation (95% HD: 0.27 +/- 0.03 mm; IoU: 92% +/- 1.0; DSC: 96% +/- 1.0). There was a statistically significant difference of the time-consumed among the segmentation methods (p < .001). The AI-driven segmentation (51.5 +/- 10.9 s) was 116 times faster than the manual segmentation (5973.3 +/- 623.6 s). The R-AI method showed intermediate time-consumed (1666.7 +/- 588.5 s). ConclusionAlthough the manual segmentation showed slightly better performance, the novel CNN-based tool also provided a highly accurate segmentation of the maxillary alveolar bone and its crestal contour consuming 116 times less than the manual approach.