1.5TMR三维双回波稳态水激发序列在面神经成像中的初步应用  

Three-dimensional double echo steady state with water excitation MR imaging of facial nerve at 1.5T:A preliminary study

作　　者：秦毅[1,2] 张敬[1] 李金亭[2] 王妍[2] 

机构地区：[1]天津医科大学总医院放射科,天津300052 [2]天津中医药大学第一附属医院放射科,天津300193

出　　处：《中国医学影像技术》2010年第4期647-650,共4页Chinese Journal of Medical Imaging Technology

摘　　要：目的探讨三维双回波稳态水激发(3D-DESSwe)序列在面神经成像中的应用价值。方法采用1.5TMR3D-DESSwe序列对15名健康志愿者行面神经扫描,然后进行多平面重组(MPR)及薄层最大强度投影(MIP),后处理图像与格氏解剖学图谱进行比较,由两位阅片者协商采用三分法对图像质量和面神经显示可靠性进行评估:2分:图像均匀,面神经显示清晰;1分:图像局部欠均匀,面神经显示模糊;0分:图像不均匀,无法显示面神经。结果所有志愿者两侧面神经均获得清晰的描述,面神经与周围结构对比明显,所得图像评分均为2分。脑池段面神经呈高信号,其周围流动的脑脊液呈低信号;内听道段面神经呈相对低信号,内听道内流动受限的脑脊液呈高信号。迷路段、鼓室段、乳突段及颅外段面神经呈高信号,周围骨质、软组织呈低信号,可显示部分面神经分支。结论3D-DESSwe序列可以显示面神经全长,尤其对于显示面神经颞骨内段、颅外段更有价值。Objective To assess the value of three-dimensional double echo steady state with water excitation （3D-DESSwe） MR sequence in depicting the normal anatomy of facial nerve. Methods 3D-DESSwe MR sequence was performed in 15 healthy volunteers on a 1.5T MR. The 3D datasets obtained were constructed in relation to the course of the facial nerve using multi-planar reconstruction （MPR） and thin slice maximum intensity projection （MIP） programs,and the images acquired were compared with anatomical textbook diagrams. Two doctors analyzed the images in collaboration and recorded on an arbitrary scale of 0—2 grades （grade 2,homogeneity and facial nerve identified with certainty; grade 1,mild inhomogeneity and facial nerve probably identified; grade 0,severe inhomogeneity and facial nerve not identified）. Results In all subjects,3D-DESSwe images provided reliable definition of the normal facial nerve anatomy bilaterally and high contrast between the facial nerve and adjacent structures were obtained. The cisternal segment of facial nerve showed high signal intensity while the moving CSF flow surrounding it showed low signal intensity. The internal auditory canal （IAC） segment of facial nerve showed relatively low signal intensity while the stationary CSF surrounding it showed high signal intensity. The labyrinthine,tympanic,mastoid and extracranial segments of facial nerve showed high signal intensity while the bone and soft tissue surrounding it showed low signal intensity,and parts of facial nerve branches could be demonstrated. Conclusion 3D-DESSwe sequence can display the complete course of the normal facial nerve,especially for the intratemporal and extracranial parts.

关 键 词：磁共振成像 面神经 双回波稳态 水激发 成像 三维 

分 类 号：R445.2[医药卫生—影像医学与核医学] R322.8[医药卫生—诊断学]