Evaluation of limited field of view cone-beam computed tomography for orthodontic diagnosis: A vertical and anteroposterior skeletal analysis.
Abstract: Aim & Hypothesis: In an effort to reduce patient radiation exposure, the aim of this single center, retrospective investigation was to test the validity of an orthodontic analysis for limited field of view (FOV) CBCT scans. This analysis would provide an alternative method for orthodontic diagnosis using CBCT. It was hypothesized that the new limited FOV CBCT analysis' vertical and anter... read moreoposterior skeletal measurements would have the same correlation with current cephalometric measures as current cephalometric measures have with each other. Material & Methods: One hundred consecutively selected, full head CBCT scans were utilized in the study to generate both an orthogonal cephalometric image and a limited FOV 2-D orthogonal image. The generated cephalograms were traced according to standard cephalometric methods. The limited FOV images were traced according to the new analysis utilizing the pterygomaxillary fissure as a reference plane. Diagnostic capabilities of the new analysis to identify vertical and anteroposterior skeletal patterns were analyzed using Pearson's correlation coefficients (p < 0.05). Results: Correlation between the new vertical skeletal measures, VR – MP and Ptm – Ba – MP, with Sn – GoGn, FMA, and PP – MP were moderate (0.565 ≤ r ≤ 0.619, p < 0.001). The correlation of the new anteroposterior skeletal measure, AV – BV, with traditional cephalometric indicators was strong (0.747 ≤ |r| ≤ 0.836, p < 0.001). Conclusions: The new limited FOV CBCT analysis provides information that is comparable to traditional lateral cephalometric analyses. Therefore, to reduce radiation exposure, a limited FOV CBCT scan could be used to replace full head CBCT scans for orthodontic diagnosis.
Thesis (M.S.)--Tufts University, 2014.
Submitted to the Dept. of Orthodontics.
Advisor: R. Miner.
Committee: Georgios Kanavakis, Matthew Finkelman, and Moonyoung Lee.
Keywords: Medical imaging, and Dentistry.read less