Y Kubo1,2, K Ito3, M Sone3, H Nagasawa3, Y Onishi3, N Umakoshi3, T Hasegawa3, T Akimoto2,4, M Kusumoto3. 1. From the Department of Diagnostic Radiology (Y.K., K.I., M.S., H.N., Y.O., N.U., T.H., M.K.), National Cancer Center Hospital, Tokyo, Japan yukkubo@ncc.go.jp. 2. Department of Cancer Medicine (Y.K., T.A.), Jikei University Graduate School of Medicine, Tokyo, Japan. 3. From the Department of Diagnostic Radiology (Y.K., K.I., M.S., H.N., Y.O., N.U., T.H., M.K.), National Cancer Center Hospital, Tokyo, Japan. 4. Division of Radiation Oncology and Particle Therapy (T.A.), National Cancer Center Hospital East, Kashiwa, Japan.
Abstract
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.
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 + metalartifact 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 + metalartifact reduction algorithms and model-based iterative reconstruction + metalartifact 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 + metalartifact reduction algorithms significantly reduced the artifacts and improved the image quality of structural depictions on neck CT images.
Authors: Martin H Goodenberger; Nicolaus A Wagner-Bartak; Shiva Gupta; Xinming Liu; Ramon Q Yap; Jia Sun; Eric P Tamm; Corey T Jensen Journal: J Comput Assist Tomogr Date: 2018 Mar/Apr Impact factor: 1.826
Authors: An De Crop; Jan Casselman; Tom Van Hoof; Melissa Dierens; Elke Vereecke; Nicolas Bossu; Jaime Pamplona; Katharina D'Herde; Hubert Thierens; Klaus Bacher Journal: Neuroradiology Date: 2015-05-01 Impact factor: 2.804
Authors: Michael M Lell; Esther Meyer; Michael A Kuefner; Matthias S May; Rainer Raupach; Michael Uder; Marc Kachelriess Journal: Invest Radiol Date: 2012-07 Impact factor: 6.016