Evaluation of the Efficacy of A Metal Artifact Reduction Algorithm in Different CBCT Scanning Parameters

Publication date: Available online 9 March 2017
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Polyane Mazucatto Queiroz, Francisco Carlos Groppo, Matheus Lima Oliveira, Francisco Haiter-Neto, Deborah Queiroz Freitas
ObjectiveThe aim of this study was to evaluate the efficacy of a metal artifact reduction (MAR) algorithm in CBCT images of dental materials obtained with different field-of-view (FOV) and voxel sizes.MethodologyTwo imaging phantoms were custom-made of acrylic resin. Each phantom had three cylinders made of the same dental material: dental amalgam or copper-aluminum alloy. CBCT scans were obtained separately for each of the imaging phantoms using the Picasso-Trio CBCT unit at four FOV sizes and two voxel sizes. Each imaging phantom was scanned with and without MAR. All images were evaluated in the OnDemand3D software and image noise (gray value variability) was calculated as the standard deviation of the gray values of regions of interest around the dental material cylinders. Data were compared by the Friedman test and Dunn's post hoc test (α=0.05). Intraclass correlation coefficient (ICC) was calculated to assess intra-observer reliability.ResultsMAR significantly reduced (p<0.05) image noise around the dental materials, irrespective of FOV and voxel sizes, with an ICC of 0.997.ConclusionThe efficacy of MAR was similar for the different FOV and voxel sizes studied. Hence, imaging protocols and the use of MAR algorithm should be based on the selection criteria.



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