Volumetric accuracy of cone-beam computed tomography
박철우, 김진호, 서유경, 이새롬, 강주희, 오송희, 김규태, 최용석, 황의환,
소속 상세정보
박철우 ( Park Cheol-Woo ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
김진호 ( Kim Jin-Ho ) - 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
강주희 ( Kang Ju-Hee ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
오송희 ( Oh Song-Hee ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
김규태 ( Kim Gyu-Tae ) - Kyung Hee University Graduate School Department of Oral and Maxillofacial Radiology
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 performed to investigate the influence of object shape and distance from the center of the image on the volumetric accuracy of cone-beam computed tomography (CBCT) scans, according to different parameters of tube voltage and current.
Materials and Methods: Four geometric objects (cylinder, cube, pyramid, and hexagon) with predefined dimensions were fabricated. The objects consisted of Teflon-perfluoroalkoxy embedded in a hydrocolloid matrix (Dupli-Coe-Loid TM; GC America Inc., Alsip, IL, USA), encased in an acrylic resin cylinder assembly. An Alphard Vega Dental CT system (Asahi Roentgen Ind. Co., Ltd, Kyoto, Japan) was used to acquire CBCT images. OnDemand 3D (CyberMed Inc., Seoul, Korea) software was used for object segmentation and image analysis. The accuracy was expressed by the volume error (VE). The VE was calculated under 3 different exposure settings. The measured volumes of the objects were compared to the true volumes for statistical analysis.
Results: The mean VE ranged from ?4.47% to 2.35%. There was no significant relationship between an object’s shape and the VE. A significant correlation was found between the distance of the object to the center of the image and the VE. Tube voltage affected the volume measurements and the VE, but tube current did not.
Conclusion: The evaluated CBCT device provided satisfactory volume measurements. To assess volume measurements, it might be sufficient to use serial scans with a high resolution, but a low dose. This information may provide useful guidance for assessing volume measurements.
키워드
Cone-Beam Computed Tomography; Phantom; Imaging; Three-Dimensional
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