PT - JOURNAL ARTICLE AU - Y. Kubo AU - K. Ito AU - M. Sone AU - H. Nagasawa AU - Y. Onishi AU - N. Umakoshi AU - T. Hasegawa AU - T. Akimoto AU - M. Kusumoto TI - Diagnostic Value of Model-Based Iterative Reconstruction Combined with a Metal Artifact Reduction Algorithm during CT of the Oral Cavity AID - 10.3174/ajnr.A6767 DP - 2020 Sep 24 TA - American Journal of Neuroradiology 4099 - http://www.ajnr.org/content/early/2020/09/24/ajnr.A6767.short 4100 - http://www.ajnr.org/content/early/2020/09/24/ajnr.A6767.full AB - BACKGROUND AND PURPOSE: Metal artifacts reduce the quality of CT images and increase the difficulty of interpretation. This study compared the ability of model-based iterative reconstruction and hybrid iterative reconstruction to improve CT image quality in patients with metallic dental artifacts when both techniques were combined with a metal artifact reduction algorithm.MATERIALS AND METHODS: This retrospective clinical study included 40 patients (men, 31; women, 9; mean age, 62.9 ± 12.3 years) with oral and oropharyngeal cancer who had metallic dental fillings or implants and underwent contrast-enhanced ultra-high-resolution CT of the neck. Axial CT images were reconstructed using hybrid iterative reconstruction and model-based iterative reconstruction, and the metal artifact reduction algorithm was applied to all images. Finally, hybrid iterative reconstruction + metal artifact reduction algorithms and model-based iterative reconstruction + metal artifact reduction algorithm data were obtained. In the quantitative analysis, SDs were measured in ROIs over the apex of the tongue (metal artifacts) and nuchal muscle (no metal artifacts) and were used to calculate the metal artifact indexes. In a qualitative analysis, 3 radiologists blinded to the patients’ conditions assessed the image-quality scores of metal artifact reduction and structural depictions.RESULTS: Hybrid iterative reconstruction + metal artifact reduction algorithms and model-based iterative reconstruction + metal artifact reduction algorithms yielded significantly different metal artifact indexes of 82.2 and 73.6, respectively (95% CI, 2.6–14.7; P < .01). The latter algorithms resulted in significant reduction in metal artifacts and significantly improved structural depictions(P < .01).CONCLUSIONS: Model-based iterative reconstruction + metal artifact reduction algorithms significantly reduced the artifacts and improved the image quality of structural depictions on neck CT images.IRiterative reconstructionhybrid-IR+MARcombination of hybrid iterative reconstruction and metal artifact reduction algorithmsMARmetal artifact reduction algorithmsMBIRmodel-based iterative reconstructionMBIR+MARcombination of model-based iterative reconstruction and metal artifact reduction algorithmsU-HRCTultra-high-resolution CT