Abstract #0046

Reducing Brain MRI Artifacts Caused by Ferromagnetic Orthodontic Appliances Using Permanent Magnets

Zhiyue J Wang^1,2, Yong Jong Park^1,2, Youngseob Seo^1,2, Michael C Morriss^1,2, and Nancy K Rollins^1,2

¹UT Southwestern Medical Center, Dallas, TX, United States, ²Children's Medical Center, Dallas, TX, United States

Stainless steel orthodontic appliances are commonly found in adolescents undergoing clinical brain MRI examinations. They cause severe magnetic susceptibility artifacts and failure to obtain diagnostic information from many MR techniques. The B₀ shimming capability present on clinical MR scanners cannot remove these artifacts. We have constructed devices for the correction of these artifacts at 1.5 T using small pieces of permanent magnets mounted on intra-oral mouth guards or an extra-oral mouth-band. The magnetic field from the permanent magnets cancels the B₀ inhomogeneity induced by ferromagnetic orthodontic appliances, resulting in drastic improvement of MR image quality.

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