Linear accuracy of cone-beam computed tomography and a 3-dimensional facial scanning system: An anthropomorphic phantom study
오송희, 강주희, 서유경, 이새롬, 최화영, 최용석, 황의환,
소속 상세정보
오송희 ( Oh Song-Hee ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
강주희 ( Kang Ju-Hee ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
서유경 ( Seo Yu-Kyeong ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
이새롬 ( Lee Sae-Rom ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
최화영 ( Choi Hwa-Young ) - Kyungwoon University College of Health Department of Dental Hygiene
최용석 ( Choi Yong-Suk ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
황의환 ( Hwang Eui-Hwan ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
Abstract
Purpose: This study was conducted to evaluate the accuracy of linear measurements of 3-dimensional (3D) images generated by cone-beam computed tomography (CBCT) and facial scanning systems, and to assess the effect of scanning parameters, such as CBCT exposure settings, on image quality.
Materials and Methods: CBCT and facial scanning images of an anthropomorphic phantom showing 13 soft-tissue anatomical landmarks were used in the study. The distances between the anatomical landmarks on the phantom were measured to obtain a reference for evaluating the accuracy of the 3D facial soft-tissue images. The distances between the 3D image landmarks were measured using a 3D distance measurement tool. The effect of scanning parameters on CBCT image quality was evaluated by visually comparing images acquired under different exposure conditions, but at a constant threshold.
Results: Comparison of the repeated direct phantom and image-based measurements revealed good reproducibility. There were no significant differences between the direct phantom and image-based measurements of the CBCT surface volume-rendered images. Five of the 15 measurements of the 3D facial scans were found to be significantly different from their corresponding direct phantom measurements (P<.05). The quality of the CBCT surface volume-rendered images acquired at a constant threshold varied across different exposure conditions.
Conclusion: These results proved that existing 3D imaging techniques were satisfactorily accurate for clinical applications, and that optimizing the variables that affected image quality, such as the exposure parameters, was critical for image acquisition.
키워드
Imaging; Three-Dimensional; Dimensional Measurement Accuracy; Anthropometry; Cone-beam computed tomography
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