衔铁数量对MRI成像的影响

MRI Artifacts Caused by Keepers in A Dental Arch

目的 观察 1～ 4个衔铁引起MRI伪影的程度。方法 实验在 0 .15Tesla永磁型磁共振机上进行 ,样本选用JJ 型磁性固位体的衔铁部分 ,在志愿者口腔内进行矢状面扫描 ,对MRI成像进行测量并分析其最大径。结果 1～ 4个衔铁引起伪影的最大径在 10 1～ 10 9.6mm范围内。结论 即使在患者口腔内同时安装 4个衔铁 ,进行MRI检查时产生的伪影仍十分局限。

Objective This research was designed to observe the degree of artifacts caused by 1-4 keepers.Methods Samples were imaged in a living human subject by 0.15 Tesla MR devices in sagital plane. Results were analyzed and the maximal diameters of artifacts were measured.Results The maximal diameters of the artifacts caused by 1-4 keepers were 101-109.6mm.Conclusion Even with four keepers in the dental arch, the degree of artifact is still limited.