An Experimental Study of Dental Materials'Artifacts on MR Images

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An Experimental Study of Dental Materials'Artifacts on MR Images

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Grant
Kyushu Univ. Production Kyushu Univ. Production
Title(Other Language):
MRIにおける画像障害因子の発生と除去に関する実験的研究
Responsibility:
米津 康一(九州大学・歯学部・助手)
YONETSU Koichi(九州大学・歯学部・助手)
Language:
Japanese
Project Year:
1991-1992
Latest Report:
Magnetic Resonance Imaging(MRI)is becoming an important method in evaluating various pathologic conditions of oral and maxillofacial region.Unfortunately,certain dental materials cause variable artifacts on MR images that can obscure the relation between the normal surrounding tissues and the pathologic conditions.The purpose of this study is to evaluate the potential producing artifacts from various dental metallic materials in vitro.The results obtained by each material in vitro were compared with the artifacts usually observed in vivo.Thirteen rectangle-shaped metals (1.2x10x20mm)and two types of surgical plate commonly used in the dentistry were tested in this study.MRI were obtained with a 1.0-T superconducting magnet(SMT-100,Shimadzu)and 0.2-T permanent magnet(MRP-20-2,Hitachi Medico).The images were acquired with a spin-echo and a gradient-echo pulse sequences. The following results were obtained: (1)Three types of MR artifacts could be identified;1)Focal loss of signal intensity,2)High signal intensity surrounding the focal loss signal area,3)Distortion of image. (2)All dental materials were seen to cause artifacts.The biggest artifact was due to a surgical stainless steel plate composed of ferromagnetic(high permeability). (3)The artifacts obtained with the 1.0-T MR system were bigger than that obtained with a 0.2-T one. (4)According to in vivo studies,it is suggested that thickness and shape of metal is one of the factors that cause artifacts.Such studies are now being carried out in vitro. Read more
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