三点法非对称回波水脂分离技术在固定金属义齿患者眼眶磁共振成像中的应用研究  

Study of Orbital MRI in Patients with Fixed Metal Dentures Using Iterative Decomposition of Water and Fat with Echo Asymmetry and Least-Squares Estimation Technique

作　　者：杨仁杰[1] 查云飞[1] 张宇[1] 刘昌盛[1] YANG Renjie;ZHA Yunfei;ZHANG Yu(Department of Radiology,Renmin Hospital of Wuhan University,Wuhan,Hubei Province 430060,P.R.China)

机构地区：[1]武汉大学人民医院放射科

出　　处：《临床放射学杂志》2018年第10期1745-1749,共5页Journal of Clinical Radiology

摘　　要：目的通过比较三点法非对称回波水脂分离（IDEAL）技术和频率选择脂肪饱和（FS）技术在眼眶MRI中的图像质量和脂肪抑制效果,探讨IDEAL技术在固定金属义齿患者眼眶MRI中的应用价值。方法搜集38例眼眶MRI检查的固定金属义齿患者,固定义齿材料均为镍铬合金。扫描序列包括轴、冠、斜矢状面FS T_2WI和IDE-AL T_2WI,其中15例平扫后行增强轴、冠、斜矢状面FS T_1WI和IDEAL T_1WI。比较两种脂肪抑制技术之间的图像质量和脂肪抑制效果。结果轴、冠、斜矢状面IDEAL T_2WI的图像质量评分以及脂肪抑制效果评分均高于FS T_2WI（P=0.000）;增强扫描轴、冠、斜矢状面IDEAL T_1WI的图像质量评分以及脂肪抑制效果评分均高于FS T_1WI（P=0.000）。结论IDEAL技术可以替代FS技术成为固定金属义齿患者眼眶MRI的常规技术,提供更加均匀的脂肪抑制效果和更高的图像质量。Objective To investigate the value of iterative decomposition of water and fat with echo asymmetry and least-squares estimation（IDEAL）technique in orbital MRI when patients with fixed Metal dentures by comparing image quality and effect of fat suppression with frequency-selective fat saturation（FS）technique.Methods38 patients with fixed Metal dentures accepted orbital MRI,the materials of the fixed Metal dentures were all Ni-Cr alloys.Scanning sequences contained axial,coronal and oblique sagittal FS T_2WI and IDEAL T_2WI,15 of them accepted contrast enhanced axial,coronal and oblique sagittal FS T_1WI and IDEAL T_1WI.Image quality and effect of fat suppression between the two fat suppression techniques were compared.Results The image quality scores and the effect of fat suppression scores of axial,coronal and oblique sagittal IDEAL T_2WI were all higher than those of FS T_2WI（P=0.000）.The image quality scores and the effect of fat suppression scores of axial,coronal and oblique sagittal IDEAL T_1WI were all higher than those of FS T_1WI（P=0.000）after contrast enhanced.Conclusion IDEAL can replace FS as a routine technique in orbital MRI in patients with fixed Metal dentures,which provides more uniform effect of fat suppression and higher image quality.

关 键 词：三点法非对称回波水脂分离 频率选择脂肪饱和 义齿 眼眶 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学] R777.5[医药卫生—诊断学]