Metal artifacts with dental implants: Evaluation using a dedicated CT/MR oral phantom with registration of the CT and MR images

The aims of this study were to develop a computed tomography/magnetic resonance (CT/MR) oral phantom with insertable dental implants and to register CT/MR images to generate artifact-free MR images for patients undergoing teeth restorations. All measurements were done using a human MR scanner with s...

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Bibliographic Details
Published in:Scientific reports 2019-01, Vol.9 (1), p.754-754, Article 754
Main Authors: Lee, Min-Young, Song, Kyu-Ho, Lee, Jeong-Woo, Choe, Bo-Young, Suh, Tae Suk
Format: Article
Language:English
Subjects:
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Computed tomography
Dental implants
Dental prosthetics
Head and neck
Humanities and Social Sciences
multidisciplinary
Registration
Science
Science (multidisciplinary)
Teeth
Tomography
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Summary:The aims of this study were to develop a computed tomography/magnetic resonance (CT/MR) oral phantom with insertable dental implants and to register CT/MR images to generate artifact-free MR images for patients undergoing teeth restorations. All measurements were done using a human MR scanner with spin echo (SE) and gradient echo (GRE) sequences image scan together with CT image. The metal regions and normal teeth parts are extracted with a suitable threshold from an initial image reconstructed with artifact from the CT images. Corrected metal projection regions of MR images and CT images are fused to produce artifact-free MR image that include dental restorations. After CT/MR registration, artifact size presented differences on the x- (SE, 12.0 mm; GRE, 18.0 mm) and y- (SE, 24.0 mm; GRE, 36.6 mm). When comparing the dental restoration with normal teeth, the structural similarity index metric (SSIM) of GRE 50 was lower than for the GRE 8 sequence and the SSIM of SE 145 shown higher than for the SE 490 sequence. The dedicated phantom provides a useful tool in head and neck research for multi-modality images. Therefore, CT/MR image-based approach for ground truth and registration offers visualization in diagnostic system and radiation treatment planning system.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-36227-0