Reproducibilities of cephalometric measurements of three-dimensional CT images reconstructed in the personal computer.
- Author:
Kug Jin JEON
1
;
Hyok PARK
;
Hee Cheol LEE
;
Kee Deog KIM
;
Chang Seo PARK
Author Information
1. Department of Oral and maxillofacial radiology, College of Dentistry, Yonsei University. csp007@yumc.yonsei.ac.kr
- Publication Type:Original Article
- Keywords:
tomography, x-ray computed;
cephalometry;
reproducibility of results
- MeSH:
Adult;
Cephalometry;
Humans;
Microcomputers*;
Reproducibility of Results;
Seoul;
Sutures;
Tomography, X-Ray Computed
- From:Korean Journal of Oral and Maxillofacial Radiology
2003;33(3):171-178
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The purpose of this study was to report the reproducibility of intra-observer and inter-observer consistency of cephalometric measurements using three-dimensional (3D) computed tomography (CT), and the degree of difference of the cephalometric measurements. MATERIALS AND METHODS: CT images of 16 adult patients with normal class I occlusion were sent to personal computer and reconstructed into 3D images using V-Works 3.5 TM (Cybermed Inc., Seoul, Korea). With the internal program of V-Works 3.5 TM, 12 landmarks on regular cephalograms were transformed into 21 analytic categories and measured by 2 observers and in addition, one of the observers repeated their measurements. Intra-observer difference was calculated using paired t-test, and inter-observer by two sample test. RESULTS: There were significant differences in the intra-observer measurements (p< 0.05) in four of the categories which included ANS-Me, ANS-PNS, Cdl-Go (Lt), GoL-GoR, but with the exception of Cdl-Go (Lt), ZmL-ZmR, Zyo-Zyo, the average differences were within 2 mm of each other. The inter-observer observations also showed significant differences in the measurements of the ZmL-ZmR and Zyo-Zyo categories (p< 0.05). With the exception of the Cdl-Me (Rt), ZmL-ZmR, Zyo-Zyo categories, the average differences between the two observers were within 2 mm, but the ZmL-ZmR and Zyo-Zyo values differed greatly with values of 8.10 and 19.8 mm respectively. CONCLUSION: In general, 3D CT images showed greater accuracy and reproducibility, with the exception of suture areas such as Zm and Zyo, than regular cephalograms in orthodontic measurements, showing differences of less than 2 mm, therefore 3D CT images can be useful in cephalometric measurements and treatment planning.
