Accuracy of linear measurement using cone-beam computed tomography at different reconstruction angles.
10.5624/isd.2014.44.4.257
- Author:
Sima NIKNESHAN
1
;
Shadi Hamidi AVAL
;
Neema BAKHSHALIAN
;
Shahriyar SHAHAB
;
Mahdis MOHAMMADPOUR
;
Soodeh SARIKHANI
Author Information
1. Department of Dental and Maxillofacial Radiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
- Publication Type:Original Article
- Keywords:
Cone-Beam Computed Tomography;
Dental Implants;
Dimensional Measurement Accuracy
- MeSH:
Comprehension;
Cone-Beam Computed Tomography*;
Dental Implants;
Dental Occlusion;
Dimensional Measurement Accuracy;
Mandible;
Sheep;
Titanium
- From:Imaging Science in Dentistry
2014;44(4):257-262
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: This study was performed to evaluate the effect of changing the orientation of a reconstructed image on the accuracy of linear measurements using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Forty-two titanium pins were inserted in seven dry sheep mandibles. The length of these pins was measured using a digital caliper with readability of 0.01 mm. Mandibles were radiographed using a CBCT device. When the CBCT images were reconstructed, the orientation of slices was adjusted to parallel (i.e., 0degrees), +10degrees, +12degrees, -12degrees, and -10degrees with respect to the occlusal plane. The length of the pins was measured by three radiologists, and the accuracy of these measurements was reported using descriptive statistics and one-way analysis of variance (ANOVA); p<0.05 was considered statistically significant. RESULTS: The differences in radiographic measurements ranged from -0.64 to +0.06 at the orientation of -12degrees, -0.66 to -0.11 at -10degrees, -0.51 to +0.19 at 0degrees, -0.64 to +0.08 at +10degrees, and -0.64 to +0.1 at +12degrees. The mean absolute values of the errors were greater at negative orientations than at the parallel position or at positive orientations. The observers underestimated most of the variables by 0.5-0.1 mm (83.6%). In the second set of observations, the reproducibility at all orientations was greater than 0.9. CONCLUSION: Changing the slice orientation in the range of -12degrees to +12degrees reduced the accuracy of linear measurements obtained using CBCT. However, the error value was smaller than 0.5 mm and was, therefore, clinically acceptable.
