RELIABILITY OF SEGMENTATION PROCESS BY DENTAL VOLUMETRIC TOMOGRAPHY IN THE EVALUATION OF VOLUMETRIC DIMENSIONAL AND SURFACE PROPERTIES OF MAXILLOFACIAL PATHOLOGIES
Project no. 357 · Status: Kapanmış · 2017
Summary
The aim is to assess whether manual segmentation is an accurate method in volume estimation and to compare the outcomes of manual, automatic and semi-automatic segmentation methods on cone beam computerized tomography (CBCT) images by comparing each system with water displacement method- the gold standard. CBCT images of l0 maxillary impacted teeth were used in this preliminary in vivo study. Following acquisition of CBCT scans manual, automatic and semi-automatic segmentation procedures were completed by the same operator. After surgical removal, the volumes of all impacted teeth were measured with water displacement method which was used as the gold standard. The volume of each segmented image was measured in mm3 using 3D-Doctor software. The established volumes of each segmented image were compared with those of the gold standards using the 95% confidence interval (CI) bootstrap percentiles. Intra-observer reliability was determined using intra-class correlation coefficient. All segmentation methods revealed significantly different volume values both from the gold standard and from each other (p=0.000). The semi-automatic segmentation revealed similar performance to manual method, and both systems provided comparable volumes to the gold standard than automatic method. Excellent intra-observer intra-class correlations were found for all the protocols. The actual volumes of the specimen were not obtained by manual, semi-automatic and automatic segmentation methods, and automatic segmentation yielded the poorest values. The automatic and semi-automatic segmentation methods may be improved by utilization of novel or of hybrid segmentation algorithms for faster process and more accurate results, which are imperative especially for treatment planning of surgical operations which may possess significant postoperative complications.