华西口腔医学杂志

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口腔金属材料对磁共振成像的影响

刘广顺1 任庆云1 孟令强2 雷立存1 王瑶1   

  1. 1.河北医科大学第一医院口腔科, 河北石家庄050031;2.河北医科大学口腔医院口腔修复科, 河北石家庄050017
  • 收稿日期:2010-10-25 修回日期:2010-10-25 出版日期:2010-10-20 发布日期:2010-10-20
  • 通讯作者: 刘广顺,Tel: 0311-85917302
  • 作者简介:刘广顺(1965—),男,河北人,副主任医师,硕士
  • 基金资助:

    河北省科学技术研究与发展指导计划基金资助项目(0-72761207)

The effect of the metallic dental materials on magnetic resonance imaging

LIU Guang-shun1, REN Qingyun1, MENG Ling-qiang2, LEI Li-cun1, WANG Yao1   

  1. 1. Dept. of Stomatology, The First Hospital of Hebei Medical University, Shijiazhuang 050031, China; 2. Dept. of Prosthodontics, Stomatological Hospital of Hebei Medical University, Shijiazhuang 050017, China
  • Received:2010-10-25 Revised:2010-10-25 Online:2010-10-20 Published:2010-10-20
  • Contact: LIU Guang-shun,Tel: 0311-85917302

摘要:

目的探讨口腔常用金属材料对颅脑磁共振成像的影响。方法对4种金属材料(金属结扎丝、锻造硬质无缝冠义齿、铸造镍铬合金义齿、铸造铜合金义齿)患者进行磁共振成像扫描,扫描序列包括FSE序列T1加权成像(FSE T1序列)、普通EPI扩散加权成像(DWI)序列和Propeller DWI序列。结果在FSE T1序列中,金属结扎丝、锻造硬质无缝冠义齿形成了重度伪影,铸造镍铬合金义齿形成了中度伪影,铸造铜合金义齿形成了轻度伪影。在普通EPI DWI序列中,金属结扎丝在颅脑解剖组织处有大片的磁敏感伪影无法去除,采用Propeller DWI序列时磁敏感伪影明显减弱。结论不同口腔金属材料对磁共振成像的影响不同,口腔金属材料产生的伪影与材料类型密切相关;Propeller DWI成像技术能明显消除磁敏感伪影。

关键词: 磁共振成像, 金属, 伪影

Abstract:

Objective To explore the influence of conventional metal materials in oral cavity on brain magnetic resonance imaging(MRI). Methods Four kinds of metal materials(metal ligature wire, forging hard and slotless denture, casting nichrome denture, casting copper alloy denture) in oral cavity were scanned through MRI. FSE sequence T1 weighted imaging(FSE T1), EPI diffusion-weighted imaging(DWI) sequence of ordinary, Propeller DWI imaging were used. Results In FSE T1 sequence, metal ligature wire and forging hard and slotless denture produced serious false image, casting nichrome denture produced moderate false image, casting copper alloy denture produced only little false image. In EPI DWI sequence, obvious magnetic-sensitive false image were produced in the dissection tissue of the brain by metal ligature wire. While in Propeller DWI sequence, magnetic -sensitive false image were greatly reduced and satisfactory images were formed. Conclusion Different metal materials in oral cavity have different influence on the MRI. The false images produced by different metal materials are closely related to the type of the material. Magnetic-sensitive false images can be eliminated by Propeller DWI technique.

Key words: magnetic resonance imaging, metal, false image