1 マルチブラケット装置が磁気共鳴画像装置に及ぼす金属アーチファクトについて(第520回大阪歯科学会例会)

概要

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We examined the metallic artifacts created in magnetic resonance images (MRI) of multibracket appliances using steel, resin and ceramic brackets placed on plastic study models. The steel wires placed were plane archwire, archwire bended L-loops and archwire bended keyhole loops. We used a 1.5 Tesla super-conductive magnetic resonance imaging (MRI) machine to make 3 sequences of images: spine echo T1 weighted images, fast gradient echo for three-dimensional T2 weighted images, and fluid attenuated inversion recovery images. A model that adapted steel brackets, archwire bended keyhole loops, palatal bar and steel ligatures produced the largest metallic artifacts, while ceramic brackets, archwire bended L-loops, and elastic ligatures produced the smallest metallic artifacts. These findings suggest that clinicians should be aware of metallic artifacts in MRI caused by multibracket appliances.
大阪歯科学会の論文
2009-12-25