Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT.

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT.

Dentomaxillofac Radiol. 2017 Jan 26;:20160315

Authors: Jasa GR, Shimizu M, Okamura K, Tokumori K, Takeshita Y, Weerawanich W, Yoshiura K

Abstract
Objectives The purpose of this study was to clarify the effects of exposure parameters and image processing methods when using cone beam CT (CBCT) to detect clear and unclear mandibular canals (MCs). Methods Twenty-four dry half mandibles were divided into two groups with clear and unclear MCs based on a previous CBCT study. Mandibles were scanned using a CBCT system with varying exposure parameters (tube voltages 60, 70, and 90 kV; and tube currents 2, 5, 10 and 15 mA) to obtain a total of 144 scans. The images were processed with different slice thicknesses using ImageJ software. Five radiologists evaluated the cross-sectional images of the first molar region to detect the MCs. The diagnostic accuracy of varying exposure parameters and image processing conditions was compared with areas under the curves (Az) in receiver operating characteristic (ROC) analysis.
RESULTS: The Az values for clear MCs were higher than those for unclear MCs (p < 0.0001). With increasing exposure voltages and currents, Az values increased, but no significant differences were found with high voltages and currents in clear MCs (p = 1.0000 and p = 0.9340). The Az values of serial images were higher than those of overlaid images (p < 0.0001), and those for thicker slices were higher than those for thinner slices (p < 0.0001).
CONCLUSIONS: Our findings indicate that detection of unclear MCs requires either higher exposure parameters or processing of the images with thicker slices. To detect clear MCs, lower exposure parameters can be used.

PMID: 28125294 [PubMed - as supplied by publisher]

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