| 不同磁场强度下镍铬合金固定修复体MRI伪影的比较 |
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| 引用本文： | 邵晨婴,俞立英,解春,林江.不同磁场强度下镍铬合金固定修复体MRI伪影的比较[J].上海交通大学学报(医学版),2008,28(11). |
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| 作者姓名： | 邵晨婴 俞立英 解春 林江 |
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| 作者单位： | [1]复旦大学华山医院口腔科,上海200040 [2]复旦大学中山医院放射科,上海200032 |
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| 摘 要： | 目的 探讨不同磁场强度(1.5 T和3.0 T)对镍铬合金固定修复体磁共振成像(MRI)中伪影的影响.方法 以镍铬合金制作不同厚度的单冠、桥修复体及上半口修复体作为试样,置于盛有清水的容器中央,分别于1.5 T和3.0 T的磁场强度下进行MR扫描,勾画和计算伪影面积并进行比较分析,以相同形状和厚度的塑料修复体作为对照修复体.结果 镍铬合金固定修复体在MRI中均可产生伪影,其面积随修复体体积的增加而扩大,而对照修复体未见伪影形成.与1.5 T MRI相比,3.0 T MRI上产生的伪影面积显著增大(P<0.05);相同磁场强度下,与扫描序列T2WI相比,扫描序列T1WI上所形成的伪影面积显著增大(P<0.05).结论 口腔内有镍铬合金固定修复体的患者在行MRI检查时,应选择较低的磁场强度及快速自旋回波序列进行扫描.应避免选用镍铬合金制作大范围固定修复体.
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| 关 键 词： | 伪影 磁共振成像 磁场强度 镍铬合金 修复体 |
Comparison of MRI artifacts caused by Ni-Cr alloy fixed prostheses on different field-strength magnets |
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| SHAO Chen-ying,YU Li-ying,XIE Chun,LIN Jiang.Comparison of MRI artifacts caused by Ni-Cr alloy fixed prostheses on different field-strength magnets[J].Journal of Shanghai Jiaotong University:Medical Science,2008,28(11). |
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| Authors: | SHAO Chen-ying YU Li-ying XIE Chun LIN Jiang |
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| Institution: | 1.Department of Stamotology;Huashan Hospital;Fudan University;Shanghai 200040;China;2.Department of Radiology;Zhongshan Hospital;Shanghai 200032;China |
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| Abstract: | Objective To evaluate the influence of different field-strength magnets(1.5 T and 3.0 T)on MRI artifacts caused by Ni-Cr alloy fixed prostheses.Methods The crown,bridge and upper denture fixed prostheses with different thickness were produced by Ni-Cr alloy as test samples,and were one by one put on the centre of water phantom for MR scanning with different field-strength magnets(1.5 T and 3.0 T).The artifact areas on these two field-strength magnets were measured and statistically compared.The plastic pros... |
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| Keywords: | artifact MRI field strength Ni-Cr alloy prosthesis |
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