Reproducibilities of cephalometric measurements of three-dimensional CT images reconstructed in the personal computer / 대한구강악안면방사선학회지
Korean Journal of Oral and Maxillofacial Radiology
;
: 171-178, 2003.
Article
in Korean
| WPRIM
| ID: wpr-221763
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 ANDMETHODS:
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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Sutures
/
Microcomputers
/
Tomography, X-Ray Computed
/
Cephalometry
/
Reproducibility of Results
/
Seoul
Limits:
Adult
/
Humans
Country/Region as subject:
Asia
Language:
Korean
Journal:
Korean Journal of Oral and Maxillofacial Radiology
Year:
2003
Type:
Article
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