Volumetric accuracy of cone-beam computed tomography.
10.5624/isd.2017.47.3.165
- Author:
Cheol Woo PARK
1
;
Jin ho KIM
;
Yu Kyeong SEO
;
Sae Rom LEE
;
Ju Hee KANG
;
Song Hee OH
;
Gyu Tae KIM
;
Yong Suk CHOI
;
Eui Hwan HWANG
Author Information
1. Department of Oral and Maxillofacial Radiology, Graduate School, Kyung Hee University, Seoul, Korea. hehan@khu.ac.kr
- Publication Type:Original Article
- Keywords:
Cone-Beam Computed Tomography;
Phantom;
Imaging, Three-Dimensional
- MeSH:
Americas;
Colloids;
Cone-Beam Computed Tomography*;
Imaging, Three-Dimensional;
Seoul
- From:Imaging Science in Dentistry
2017;47(3):165-174
- CountryRepublic of Korea
- Language:English
-
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.
