水成像在视神经磁共振扫描中的应用

Application of Magnetic Resonance Hydrography Technology in Optic Nerve Scanning

目的评价磁共振水成像技术(magnetic resonance hydrography,MRH)在视神经扫描中的应用价值。方法选取我院2013年6月至2014年5月行眼眶磁共振检查患者35例,均行2D水成像和3维各向同性T2加权快速自旋回波扫描。结果采用3D-173扫描视神经的SNR显著高于2D-173-200序列和2D-173-330序列扫描时的SNR(分别为t=4.5,P<0.001;t=7.2,P<0.001);当接收带宽分别为330和200时,2D-80、2D-100和2D-173扫描时视神经SNR均有统计学差异(分别为X2=30.4,P<0.001;X2=30.4,P<0.001);当视野(field of view,FOV)为173时,接收带宽为200时,视神经SNR显著高于接收带宽为330时;FOV为80和100时,尚未发现不同接收带宽扫描时的视神经SNR存在统计学差异(分别为Z=-0.3,P=0.756;Z=-1.4,P=0.159)。结论水成像磁共振技术能够使视神经清晰显像,视野越大,三维像素越大,图像质量越高;与2D序列相比较,3D序列扫描技术获得的信噪比图像质量明显提高。

Objective To explore the clinical value of magnetic resonance hydrography （MRH） technology in optic nerve scanning. Methods 35 patients performed orbit magnetic resonance imaging from June 2013 to May 2014 in our hospital were selected. All the patients were performed 2D and 3D same direction T2 weighted rapid spin echo sequences scanning. Results Compared with 2D-173-200 sequence and 2D-173-330 sequence, when performed with 3D-173 sequence, the value of SNR was significantly higher （t=4.5, P〈0.001; t=7.2, P〈0.001）. When bandwidth was set as 330 or 200, the values of SNR in 2D-80, 2D-100 and 2D-173 sequences were significantly different （X2=30.4, P〈0.001; X2=30.4, P〈0.001）. When field of view （FOV） was set as 173, the values of SNR in the bandwidths of 200 were significantly higher than that in 330. No statistical differences were found in SNR when FOV set as 80 and 100 （Z=-0.3, P=0.756;Z=-1.4, P=0.159）. Conclusion MRH could make clear optic nerve image;the wider of FOV, the larger of pixels, and the higher quality of image; compared with 2D sequence, 3D sequence could have higher SNR value and higher quality of image.