磁共振小视野表面线圈在距骨软骨损伤成像中的应用

Application of MR small FOV surface coil in talar osteochondral lesions imaging

目的比较靴形线圈的质子密度加权成像(2D-FSE-PD)、三维可变翻转角快速自旋回波序列(3D-SPACE)成像和小FOV表面线圈2D-FSE-PD序列成像对距骨软骨损伤成像的准确率。方法对43例患者(45个踝关节)采用靴形线圈行2D-FSE-PD和3D-SPACE序列扫描,然后更换为小FOV表面线圈行2D-FSE-PD成像。以关节镜检查结果为金标准,比较3种扫描方法显示距骨软骨损伤的符合率。结果小FOV表面线圈2D-FSE-PD序列的符合率为86.67%(39/45),靴形线圈2D-FSE-PD序列的符合率为60.00%(27/45),靴形线圈3D-SPACE序列的符合率为68.89%(31/45)。小FOV表面线圈2D-FSE-PD序列的符合率高于靴形线圈3D-SPACE序列(χ~2=4.114,P=0.002)和2D-FSE-PD序列(χ~2=8.182,P<0.001),而靴形线圈3D-SPACE序列的符合率与2D-FSE-PD序列的差异无统计学意义(χ~2=0.776,P=0.125)。结论与靴形线圈的2D-FSE-PD与3D-SPACE序列相比,小FOV表面线圈2D-FSE-PD成像能更好地显示距骨软骨损伤。

Objective To compare the accuracy rate of talar osteochondral lesions between the small field of view（FOV）surface coil MR imaging and 2D FSE proton density weighted imaging（2D-FSE-PD）,3D-SPACE sequences MR imaging with boot-shaped coil.Methods Totally 43 patients（45 ankles）underwent 3D-SPACE sequence after 2D-FSE-PD sequence scanning using the boot-shaped coil,then the PDWI sequence was scanning after the boot-shaped coil was replaced by the small FOV surface coil at 1.5T MRI.The results of the arthroscopic examinations was regarded as the standard for assessing the accuracy rate of the three methods.Results The accuracy rate of 2D-FSE-PD sequence with small FOV surface coil was 86.67%（39/45）,the accuracy rate of 2D-FSE-PD sequence with boot coil was 60.00%（27/45）,the accuracy rate of 3D-SPACE sequence with boot coil was 68.89%（31/45）.The accuracy rate of small FOV surface coil was higher than those of boot coil used 3D-SPACE sequence（χ~2=4.114,P=0.002）and boot coil used 2D-FSE-PD sequence（χ2=8.182,P〈0.001）.There was not significant difference between 3D-SPACE sequence using boot coil and 2D-FSE-PD sequence using boot coil（χ2=0.776,P=0.125）.Conclusion Compared with the 2D-FSE-PD and 3D-SPACE sequences with boot-shaped coil,the small surface coil scanning with routine sequence can show talar osteochondral lesions better.