The performance of metal artifact reduction algorithms in CBCT images considering the effects of materials, metal positions, and fields of view

Publication date: Available online 26 September 2018

Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

Author(s): Karla de Faria Vasconcelos, Marina Codari, Polyane Mazucatto Queiroz, Laura Ferreira Pinheiro Nicolielo, Deborah Queiroz Freitas, Chiarella Sforza, Reinhilde Jacobs, Francisco Haiter-Neto

Abstract

Objective

To assess the performance of two metal artifact reduction (MAR) algorithms in CBCT imaging, considering different materials, metal positions, and fields of view (FOVs).

Materials and Methods

Nine phantoms containing cylinders of amalgam, copper-aluminum alloy, and titanium were scanned using Picasso Trio and ProMax 3D CBCT units with small and medium FOVs. Scans were made with and without MAR algorithms. The standard deviation (SD) of voxel gray values was measured in the neighborhood of the cylinders. Differences in SD were statistically evaluated for effects of MAR and the other parameters with 5% significance level.

Results

Significant differences between images with and without MAR for both devices (p≤0.0001) were observed. Amalgam showed the largest artifact expression, followed by Cu-Al and titanium. After correction, differences remained only in Picasso Trio images (p = 0.002). Considering positions, no significant difference in MAR performance was observed in either device. Considering FOVs, significant differences were observed for ProMax 3D (p = 0.005), with less artifact expression in the medium FOV after MAR correction.

Conclusion

MAR algorithms were effective for artifact reduction, despite performing differently according to device, FOV, and material properties. The position of the metal cylinder within the FOV had no significant effect.

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