两种不同磁共振线圈对肘部正常尺神经扩散张量成像的影响

Effects of two different magnetic resonance coils on the diffusion tensor imaging of normal ulnar nerve in the elbow

目的:探讨使用膝关节专用线圈(Ex)和表面阵列线圈(Fl)对肘部正常尺神经扩散张量(DTI)成像的影响。方法:分别使用Ex线圈和Fl线圈采集31名志愿者肘部尺神经图像并建立扩散示踪图(DTT)。比较两种线圈成像时,尺神经各向异性分数(FA值)、表观扩散系数(ADC值)、神经纤维束长度和DTI图像质量的差异。结果:共分析了50例尺神经。使用Ex线圈和Fl线圈时,肘部尺神经的FA值、ADC值均无明显统计学差异(P值分别为0.482、0.263),且两者尺神经DTT评分相当(P值分别为0.615、0.704),而Ex线圈采集的DTI图像质量优于Fl线圈(P=0.004),DTT尺神经纤维束较长(P=0.000)。结论:使用Ex线圈和Fl线圈对肘部尺神经DTI成像时均能获得稳定可靠的扩散测量参数,但Ex线圈得到的图像质量更高。

Objective：To investigate the effects of the dedicated knee coil（Ex）and the phased-array surface coil（Fl）on the diffusion tensor imaging（DTI）of normal ulnar nerve in the elbow.Methods：Two different coils（Ex and Fl）were used to acquire ulnar nerve images in the elbows among 31 healthy volunteers,and the diffusion tensor tractography（DTT）was established.The differences of fractional anisotropy（FA）,apparent diffusion coefficient（ADC）,length of the ulnar nerve fibers and DTI image quality were evaluated when different coils were applied.Results：Fifty ulnar nerves were analyzed.With Ex coils and FI coils,none of the FAs,ADCs or DTT scores of the ulnar nerve showed any significant differences（P=0.482,0.263,0.615 and 0.704）.When using the Ex coil,the image quality of DTI was superior to ones using Fl coil（P=0.004）,and the ulnar nerve fibers were longer on DTI（P=0.000）.Conclusion：Both Ex and Fl coils can provide stable diffusion parameters of ulnar nerve in the elbow,while the image quality of Ex is superior to that of Fl.