目的：探讨口腔常用铸造金属桩核对头颈部磁共振成像的影响。方法：将6种金属合金（镍铬、钴铬、含钛、纯钛、钯金、金铂）制作的桩核固定于志愿者左侧上颌，进行磁共振扫描，扫描序列为SE-T1WI和TSE-T2WI。结果：方差分析显示：金属材料（F＝153．63，P＜0．05）、扫描序列（F＝70．94，P＜0．05）、桩核数量（F＝102．73，P＜0．05）均对伪影面积有显著性影响。在2个序列扫描中，伪影面积：钯金桩核＞钴铬桩核＞镍铬桩核＞金铂桩核＞含钛桩核＞纯钛桩核；2个桩核＞1个桩核；SE-T1WI＞TSE-T2WI。结论：不同金属桩核对磁共振成像伪影的影响不同，合理选择金属材料及成像序列可减小伪影。%Objective:To observe the influence of commonly used dental cast metal posts and cores on magnetic resonance imaging (MRI)for head and neck.Methods:Six kinds of posts and cores made of metal alloy (Ni-Cr alloy,Co-Cr alloy,titanium alloy,pure titanium,Pd-Au alloy and Au-Pt alloy)were respectively fixed on the mucosa of left palate of a volunteer.The maxillofacial region of the subjects was scanned by routine head sequences SE-T1WI and TSE-T2WI respectively.Results:ANOVA of factorial design analy-sis indicated significant differences of artifacts among metal materials(F=153.63,P<0.05),scanning sequences(F=70.94,P<0.05)and the number of cast posts and cores(F=102.73,P<0.05).In both sequences the size of metal artifacts were as following:Pd -Au alloy>Co-Cr alloy>Ni-Cr alloy>Au-Pt alloy>titanium alloy>pure titanium;two posts and cores>one post and core;SE-T1WI>TSE-T2WI.Conclusion:Different cast metal posts and cores have different influences on MRI artifact.Reasonably choosing the metal materials and scanning sequences can minimize artifacts on MRI.
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