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Artifacts from Dental Casting Alloys in Magnetic Resonance Imaging

¹ Advanced Biomaterials,
² Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan; and
³ Dept. of Oral and Maxillofacial Radiology, School of Dentistry, The University of Tokushima;

View larger version (92K): [in a new window]   Figure 1. MR images and illustration of ROI around sample. T2 FSE images: (a) Acrylic resin control, (b) KIK-Wing, (c) Cobaltan. GE images: (d) Acrylic resin control, (e) KIK-Wing, (f) Cobaltan. Black arrow shows signal intensification, and white arrow indicates signal void. Illustration of the phantom for imaging longitudinal section of a sample. ROI is represented as an entire gray area (g).

View larger version (31K): [in a new window]   Figure 2. Histogram of distribution of SI in the ROI around the sample. T2 FSE images: (a) Acrylic resin control, (b) KIK-Wing, (c) Cobaltan. GE images: (d) Acrylic resin control, (e) KIK-Wing, (f) Cobaltan. The reproducibility of the histogram was confirmed, and the results was similar in 5 measurements for each sample. Only a histogram of one measurement is shown here with an interval of one signal intensity.