摘要
目的探讨不同MR扫描序列中镍铬合金桩核冠模型的伪影大小。方法选取临床常用的镍铬合金制成左下6标准桩核冠模型,将其固定于水模中。应用西门子1.5 T MR扫描仪,采用头线圈对水模进行扫描,同时应用头部常用的扫描序列(SE T1WI、TSE T2WI、FLAIR、T2*WI、DWI)进行横断面扫描,观察每个成像序列中伪影面积最大的层面并测量其面积,每个数据均测量3次。应用SAS V8统计学软件对结果进行分析。结果镍铬合金在DWI序列产生的伪影最大,与其他序列的伪影比较,差异有统计学意义(P<0.05)。T2*WI序列产生的伪影与其他序列的伪影比较,差异有统计学意义(P<0.05)。T2WI序列产生的伪影与其他序列的伪影比较,差异有统计学意义(P<0.05)。T1WI和FLAIR序列伪影最小,其与DWI、T2*WI、T2WI序列的伪影比较,差异有统计学意义(P<0.05)。T1WI和FLAIR序列的伪影比较,差异无统计学意义(P>0.05)。结论不同序列金属伪影不同,DWI伪影最大,T2*WI次之,然后是T2WI,T1WI和FLAIR伪影最小。
Objective To explore the size of artifacts of Ni Cr alloy post core crown model in different MR sequences. Methods The six standard in the lower left of Ni-Cr alloy post core crown model was made and fixed in water model. Water model was scanned by 1.5 T MR using head coil.The sequence were SE T1WI,TSE T2WI,FLAIR,T2＊WI,DWI. The section of the largest artifacts was observed and its area was measured.Each data were measured for 3 times,and the result was analysed by statistical software of SAS V8. Results The artifacts areas in DWI sequence was the largest, compared with other artifacts in sequence,the difference was significant （P〈0.05）.The artifacts areas in T2＊WI sequence compared with other sequences,the difference was significant （P〈0.05）.The artifacts areas in T2WI sequence compared with other sequences,the difference was significant （P〈0.05）.The artifacts areas in T2WI and FLAIR sequence was the smallest,compared with other artifacts in sequence,the difference was significant （P〈0.05）.The artifacts areas in T1WI sequence compared with FLAIR sequence,the difference was not significant （P〉0.05）. Conclusion The artifacts size is different in different sequence.The artifacts is biggest in DWI sequence,the second is T2＊WI,then the T2WI,the arti-facts is smallest in T1WI and FLAIR sequence.
出处
《中国当代医药》
2015年第13期132-134,137,共4页
China Modern Medicine
关键词
磁共振成像
镍铬合金
伪影
成像序列
Magnetic resonance imaging
Ni-Cr alloy
Artifacts
Imaging sequence
