Are metal artefact reduction algorithms effective to correct cone beam CT artefacts arising from the exomass?

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Are metal artefact reduction algorithms effective to correct cone beam CT artefacts arising from the exomass?

Dentomaxillofac Radiol. 2018 Dec 12;:20180290

Authors: Candemil AP, Salmon B, Freitas DQ, Ambrosano GMB, Haiter-Neto F, Oliveira ML

Abstract
The aim of this study was to evaluate the effectiveness of metal artefact reduction (MAR) in cone beam computed tomography (CBCT) artefacts arising from metallic objects in the exomass. A radiographic phantom composed of 16 polypropylene tubes filled with a homogeneous radiopaque solution was created. CBCT scans were obtained with two units: Picasso Trio (Vatech, South Korea) and ProMax (Planmeca, Finland). The phantom was centred in a 5 × 5  cm field-of-view with titanium and CoCr inserts in the exomass. All scan were repeated after enabling MAR. Mean voxel values were obtained from the 16 tubes and standard deviation was calculated as a way of measuring voxel value variability. Mean values and voxel value variability were compared individually in the presence and absence of MAR by means of analysis of variance (ANOVA), followed by Tukey's test (α = 0.05). In the Picasso Trio, MAR significantly decreased mean voxel values (p ≤ 0.05) and increased voxel value variability (p > 0.05) in the presence of titanium. When CoCr was present, no statistical difference (p > 0.05) was observed. In the ProMax, MAR increased significantly mean voxel values (p ≤ 0.05) in the presence of titanium, and presented no significant difference (p > 0.05) for CoCr. Voxel value variability did not differ significantly (p > 0.05) for both materials. In conclusion, MAR was not effective to correct CBCT artefacts arising from metallic objects in the exomass in the two CBCT units used.

PMID: 30540919 [PubMed - as supplied by publisher]

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