Abstract
Objectives
The overall objective of this study was to assess how metal artefacts impact image quality of 13 CBCT devices. As a secondary objective, the influence of scanning protocols and field of view on CBCT image quality with and without metal artefacts was also assessed.
Materials and methods
CBCT images were acquired of a dry human skull phantom considering three clinical simulated conditions: one without metal and two with metallic materials (metallic pin and implant). An industrial micro-CT was used as a reference to register the CBCT images. Afterwards, four observers evaluated 306 representative image slices from 13 devices, ranking them from best to worst. Furthermore, within each device, medium FOV and small FOV standard images were compared. General linear mixed models were used to assess subjective perception of examiners on overall image quality in the absence and presence of metal-related artefacts (p < 0.05).
Results
Image quality perception significantly differed amongst CBCT devices (p < 0.05). Some devices performed significantly better, independently of scanning protocol and clinical condition. In the presence of metal artefacts, medium FOV standard scanning protocols scored significantly better, while in the absence of metal, small FOV standard yielded the highest performance.
Conclusions
Subjective image quality differs significantly amongst CBCT devices and scanning protocols. Metal-related artefacts may highly impact image quality, with a significant device-dependent variability and only few scanners being more robust against metal artefacts. Often, metal artefact expression may be somewhat reduced by proper protocol selection.
Clinical relevance
Metallic objects may severely impact image quality in several CBCT devices.
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Acknowledgements
The authors would like to acknowledge Jozef Ludovic Beckers for the provision of a gold alloy metallic post; Prof. Kaan Orhan, Dr. Dandan Song, Wouter Mollemans and Wouter Reybrouck for enabling part of the data collection investigated in this research and Wim Coucke for his assistance with the statistical analysis.
Funding
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001. Ruben Pauwels is supported by the European Union Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant agreement number 754513 and by Aarhus University Research Foundation (AIAS-COFUND).
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Victor Aquino Wanderley: investigation, data curation, writing—original draft preparation, funding acquisition; André Ferreira Leite: investigation, formal analysis and writing—original draft preparation; Karla de Faria Vasconcelos: methodology, data curation and writing—original draft preparation; Ruben Pauwels: formal analysis, writing—reviewing and editing; Francisca Müller Garcia: methodology, writing—reviewing and editing; Kathrin Becker: resources and writing—reviewing; Matheus L Oliveira: supervision, writing—reviewing and editing; Reinhilde Jacobs: conceptualisation, supervision, writing—reviewing and editing.
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This experimental study was designed and approved according to the regulations of the Belgian national council for bioethics research committee (protocol number NH019 2019–09-03) and the Helsinki Declaration.
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Wanderley, V., Leite, A., de Faria Vasconcelos, K. et al. Impact of metal artefacts on subjective perception of image quality of 13 CBCT devices. Clin Oral Invest 26, 4457–4466 (2022). https://doi.org/10.1007/s00784-022-04409-w
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DOI: https://doi.org/10.1007/s00784-022-04409-w