Influence of scan setting selections on root canal visibility with cone beam CT

Abstract

Objectives: The aim of this study was to assess the influence of scan setting selection, including field of view (FOV) ranging from small to large, number of projections and scan modes on the visibility of the root canal with cone beam CT (CBCT). Methods: One human mandible cadaver was scanned with CBCT (Accuitomo 170; J Morita MPG Corp., Kyoto, Japan) using six different FOVs (464 cm, 666 cm, 868 cm, 10610 cm, 14610 cm and 17612 cm) with either 360 or 180 projections in standard and high resolution. The right canine was selected for evaluation. Ten observers independently assessed the visibility of the canal space and overall image quality on a five-point scale.Results: The results indicate that both selections of FOV and number of projections have significant influence on root canal visibility (p 5 0.0001), whereas scan mode, whether standard or high resolution, was less relevant (p 5 0.34). Conclusions: The smallest FOV available should always be used for endodontic applications, and it is not recommended to reduce the number of projections to 180. Using the standard scan mode instead of high resolution does not negatively influence the visibility of the root canal space and is therefore recommended.

Detection accuracy of condylar defects in cone beam CT images scanned with different resolutions and units

“…In that study, a cadaver mandible was, respectively, scanned at a standard-and high-resolution mode of the Accuitomo 170 CBCT system (J Morita USA, Irvine, CA), and the results showed that the standard scan mode did not have a negative influence. 5 In another study, the detection accuracy of condylar erosions was assessed with CBCT images scanned using different voxel sizes and FOVs. The results showed that, for assessment of bony erosions, the CBCT images acquired with a 6-inch FOV at 0.2-mm voxel size were significantly better than the images acquired with a 12-inch FOV at 0.4-mm voxel size in the CB MercuRayÔ (Hitachi Medical, Twinsburgh, OH) CBCT system.…”

“…4 However, another study indicates that the use of high spatial resolution mode for a CBCT scan does not increase the visibility of the root canal space when compared with the images scanned with a standard mode. 5 These inconsistent results demonstrate the necessity of evaluation of various clinical tasks for CBCT images scanned at different spatial resolutions. In the search of literature, we did not find one study exclusively evaluating the impact of spatial resolution on CBCT image for the detection of condylar defects.…”

Accuracy of Cone-beam Computed Tomography in the Detection of a Second Mesiobuccal Root Canal in Endodontically Treated Teeth: An Ex Vivo Study

“…CBCT imaging has also been used for the detection of a second mesiobuccal (MB2) root canal in maxillary molars (6,7). However, recent literature showed that the visibility of anatomic structures including the root canal space is dependent on the CBCT machine type and scan settings such as field of view (FOV), number of projections, and resolution (8). In addition, the root filling materials (eg, Gutta-percha and sealer) have been reported to compromise the quality of the images (6,9).…”

Influence of CBCT parameters on the output of an automatic edge-detection-based endodontic segmentation

“…Our results differ from those of Panmekiate et al 17 On mandibular linear measurements, no significant differences in the distances were found between the different combinations of peak voltage and milliamperes. Using a human mandible cadaver, Hassan et al 14 showed CBCT scan mode (exposure time) was less relevant on root canal visibility. Kwong et al 12 evaluated subjectively the image quality of head skull CBCT by varying settings (mA and kV) and fields of view.…”