Objective: To evaluate and compare the clinical image quality of brain diffusionweighted imaging sequence between different types of medical MRI equipment. Materials and Methods: Based on the "Clinical Image Quality Guide" issued by American College of Radiology, we made both subjective and objective image quaity evaluation of 531 cases of clinical brain MRI DWI sequences. Subjective evaluation was conducted mainly by Likert five-point scale method, and the objective evaluation was realized by measureing the signalto-noise ratio of the region of interest. The images were divided into domestic and imported groups, as well as 1.5 T and 3.0 T groups according to the types of the scanning equipment for comparative studies, and domestic 1.5 T and 3.0 T MRI equipments of United Imaging were selected as representatives to be compared with the imported equipment. Results: (1) In the subjective evaluation, the 3.0 T group was better than the 1.5 T group and the domestic group was better than the imported group. In the objective evaluation, the 1.5 T group was better than the 3.0 T group and the difference between the domestic and imported groups was not statistically significant. (2) In the 1.5 T group, both subjective and objective evaluation of the domestic subgroup was better than that of the imported subgroup. In the 3.0 T group, the difference of the subjective evaluation between these two subgroups was not statistically significant, and the objective evaluation of the imported subgroup was superior to that of the domestic subgroup. (3) In the 1.5 T group, both subjective and objective evaluation of United Imaging was superior to that of the imported equipment. In the 3.0 T group, the difference of the subjective evaluation between United Imaging and the imported equipment was not statistically significant;the objective evaluation of United Imaging was better than that of GE, but there was a gap of the outcome between United Imaging and Philips, and the difference of the evaluation between United Imaging and Siemens was not statistically significant. Conclusions: With respect to the brain diffusion-weighted imaging, the clinical image quality of the 1.5 T domestic MRI equipment may be better than that of the imported equipment, but there is a gap of the image quality between domestic and imported equipment of 3.0 T field intensity.%目的 对不同型号医用磁共振成像设备的头颅扩散加权成像序列进行临床图像质量评价与比较研究.材料与方法 根据美国放射学会2013年指南,对531例临床头颅磁共振的DWI序列进行主观及客观图像质量评价.主观评价主要使用Likert 5级评分法,客观评价是测量图像感兴趣区的信噪比.按扫描设备将图像分为国产与进口组,以及1.5 T与3.0 T组进行比较研究,并选取1.5 T及3.0 T联影设备为代表分别与进口设备比较.结果(1)主观评价3.0 T组优于1.5 T组,国产组优于进口组;客观评价1.5 T组优于3.0 T组,国产组与进口组差异不具有统计学意义;(2)在1.5 T组中,主观及客观评价国产亚组均优于进口亚组;在3.0 T组中,主观评价国产与进口亚组差异不具有统计学意义,客观评价进口亚组优于国产亚组;(3)在1.5 T组中,主观及客观评价联影均优于进口设备;在3.0 T组中,主观评价联影与进口设备差异无统计学意义;客观评价联影优于GE,但与飞利浦有一定差距,联影与西门子差异无统计学意义.结论 在头颅磁共振扩散加权成像中,1.5 T国产磁共振设备图像质量可能优于进口设备,但3.0 T国产设备图像质量与进口设备有一定差距.
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