3.0 T MR扫描仪联合8通道相控阵眼表面线圈提高眼部肿块显示能力的多中心研究

Improved ability of demonstrating ocular masses on 3.0 T MR scanner combined with an 8-channel eye surface phased array coil:a multi-center study

目的探讨在3.0 T MR扫描仪上联合使用8通道相控阵眼表面线圈提高眼部图像质量及眼部肿块显示能力的价值。方法前瞻性收集2018年7月至2020年1月6个中心的692例拟行眼部MRI的眼部肿块初诊患者,均采用3.0 T MR扫描仪,以简单随机法分为2组,表面线圈组413例,使用8通道相控阵眼表面线圈进行扫描;头线圈组279例,使用8通道相控阵头线圈行相同序列扫描。评价2组图像的图像质量,客观评价为计算眼眶正常结构(眼睑、玻璃体、泪腺和视神经眶内段)和各部位肿块(眼睑肿块、眼球内肿块、泪腺窝肿块及眼眶肿块)图像的信噪比(SNR)和对比噪声比(CNR);主观评价为主观评分,指标包括运动伪影、肿块边缘及肿块与邻近结构关系的显示情况,并计算图像质量总体评分。采用独立样本t检验或Wilcoxon秩和检验比较2组图像间客观指标和主观评分的差异。结果表面线圈组所有图像的SNR、CNR高于头线圈组,差异有统计学意义(P<0.05),运动伪影评分低于头线圈组,差异有统计学意义(P<0.05)。表面线圈组眼球内肿块边缘、肿块与邻近结构关系评分及图像总体质量评分高于头线圈组,差异有统计学意义(P<0.001),2组间眼睑、泪腺窝及眼眶肿块边缘、肿块与邻近结构关系评分及图像总体质量评分的差异无统计学意义(P>0.05)。结论在3.0 T MR扫描仪上使用8通道相控阵眼表面线圈可提高眼部图像SNR和CNR,提高眼球内肿块边缘以及肿块与邻近结构关系的显示能力。

Objective To investigate the value of the 8-channel eye surface phased array coil in improving image quality and demonstrating ocular masses on 3.0 T MR scanner.Methods From July 2018 to January 2020,the data of orbital MRI in 692 patients with ocular masses on 6 medical centers were prospectively collected.The patients were simple randomly assigned into 8-channel eye surface phased array coil group(413 patients)or 8-channel head phased array coil group(279 patients),with the same MRI sequences.The signal to noise ratio(SNR)and contrast to noise ratio(CNR)were calculated in orbital anatomy structures and masses(eyelid mass,intraocular mass,lacrimal mass and orbital mass).The image quality scores including motion artifact,mass margin,the relationship between the mass and adjacent structures,and overall image quality were recorded.The differences of image quality between the two groups were compared by two independent sample t-test or Wilcoxon rank test.Results The SNR and CNR were higher in eye surface coil group than those in head coil group(P<0.05).The scores of ocular movement artifacts were higher in head coil group than those in surface coil group(P<0.05).The scores of intraocular mass margin,the relationship between the mass and adjacent structures,and overall image quality were higher in surface coil group than those in head coil group(P<0.001).There were no significant differences in mass margin,the relationship between the mass and adjacent structures,and overall image quality scores of eyelid,lacrimal gland,and orbital mass between the two groups(P>0.05).Conclusion 3.0 T MR scanner combined with the 8-channel eye surface phased array coil can improve the SNR and CNR of orbital MR images,the demonstration of the intraocular mass margin and the relationship between the mass and adjacent structures.