Blade技术和常规技术在眼眶磁共振扫描中对图像有效率改善的对比分析

目的：通过常规技术和Blade技术在眼眶疾病检查中图像改善程度的对比分析,探讨Blade技术对伪影发生、影像质量的改善情况和眼眶分区、伪影程度对Blade技术图像校正的影响规律。方法：选择136例患者为对比分析对象。采用德国西门子公司Trio Tim 3.0T超导磁共振成像系统,以不同参数,在相同位置（眼球区、视神经鞘区、肌锥内区、肌锥外区和骨膜外区）对所有患者先后进行常规磁共振扫描和Blade技术扫描,并以常规磁共振扫描图像的图像质量分级,获取不同组2种扫描图像和Blade技术图像改善有效率。采用Excel进行数据录入,计数资料采用百分率及构成比表示;计量资料采用配对t检验或配对秩和检验。结果：136例患者中,轻度、中度和重度伪影组年龄和性别均无统计学差异（P〉0.05）。在眼球区（χ2=22.805,P〈0.05）和视神经鞘区（χ2=14.378,P〈0.05）内,Blade技术的图像改善有效率均是重度伪影组高于轻度、中度伪影组;轻度伪影组Blade技术的图像改善有效率骨膜外区最高（80.0%）,眼球区最低（33.3%）（χ2=28.422,P〈0.05）;重度伪影组Blade技术的图像改善有效率视神经鞘区最高（82.4%）,肌锥外区最低（45.1%）（χ2=26.132,P〈0.05）。结论：Blade技术相对于常规技术,对扫描图像有效率的改善可能受眼眶分区及伪影程度的影响。

Comparative analysis on Blade and conventional technology for enhancing effectiveness rate of orbit MR images

Objective To compare Blade technology and conventional technology for enhancing the effectiveness rate of the orbit MR images, so as to make clear the effects of Blade technology on artifact and image quality as well as the influences of orbit zonation and artifact on image correction by Blade technology. Methods Totally 136 patients were selected as the subjects, and Trio Tim 3.0T superconductive MRI system from Siemens company was used for the examinations with different parameters. MRI scanning was carried out by conventional technology and Blade technology in turn for the zones of eyeball, of optic nerve sheath, within muscle cone, outside of muscle cone and outside of periosteum.Image quality grading was performed on the basis of conventional MR images to obtain the effectiveness rates of two groups of images by the two technologies. The acquired data were input with Excel, and expressed with percentage and constituent ratio. Paired t test and paired rank-sum test were used for the data. Results For the 136 patients, there was no significant difference between the ages and genders of the three groups of mild artifact, moderate artifact and severe artifact, with P0.05. In the eyeball zone（χ2=22.805, P0.05） and optic nerve sheath zone（χ2=14.378, P0.05）, Blade technology had higher effectiveness rate in the severe artifact group than those in the mild artifact group and moderate artifact group. For the mild artifact group, Blade technology had the highest effectiveness rate at the zone outside of periosteum（80.0%）, and the lowest one at the eyeball zone（33.3%）（χ2=28.422, P 0.05）. For the severe artifact group,Blade technology had the highest effectiveness rate at the optic nerve sheath zone（82.4%）, and the lowest one at the zone outside of muscle cone（45.1%）（χ2=26.132, P0.05）. Conclusion When compared with conventional technology, Blade technology has the effectiveness rate of enhanced images affected by orbit zonation and artifact severity.