膝关节半月板损伤的低场MRI诊断

Low-field MRI in diagnosis of knee meniscus injuries

目的:通过膝关节半月板的MRI表现以及成像序列选择,探讨如何提高低场MRI诊断半月板损伤的准确性。方法:MRI检查半月板损伤20例,均用冠状、横断面自旋回波(spinecho,SE)序列T1WI,横断面SET2WI及矢状面SE双回波T2WI和质子密度加权像扫描,冠状面脂肪抑制序列(STIR)。根据半月板MRI信号特征将半月板损伤分为0～3级。结果:40个半月板中,34个(85%)呈3级表现,4个(10%)呈2级表现,2个(5%)呈1级表现。半月板损伤形态呈多样性,显示为高信号,均得到手术证实,准确率为100%。结论:低场MRI只要方法得当,同样能准确地诊断半月板损伤。

Objective：To improve the diagnosis of knee meniscus injury with low-field MRI.Methods：Twenty patients with knee meniscus injures were examined by MRI.All the subjects were scanned by T1WI（SE）in coronal and cross-section,T2WI（SE）in cross-section,T2（dual-echo）and protron density weighted image in sagittal plane,and STIR in coronal plane.The knee meniscus injuries were divided into 0-3 levels by the MRI signal.Results：Of the forty knee meniscus injuries,thirty-four（85%）were diagnosed as level 3,four（10%）were diagnosed as level 2 and two（5%）were diagnosed as level 1.The morphous of injured knee meniscus was varied.High signals could be found in MRI and all were confirmed by operation.Conclusions：As long as the method is proper,low-field MRI can also diagnose meniscal injuries accurately.