眼眶磁共振扫描blade技术和常规技术对信噪比的影响

目的通过常规技术和Blade技术检查眼眶疾病患者图像信噪比，探讨Blade技术对伪影发生、影像质量的改善情况。方法选取2012-07至2013-06行眼眶磁共振扫描的患者，并且行常规眼眶Tse T2WI序列扫描时显现不同程度的不自主运动伪影，最终纳入136例。采用德国西门子公司Trio Tim3．0T超导磁共振成像系统，以在相同位置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，将136例分为轻度、中度和重度伪影组，获取不同组两种扫描图像的信噪比，从而评价Blade技术对图像质量的改善情况。结果轻度伪影组眼球区（t=4．159，P〈0．05）和骨膜外区（t=-4．306，P〈0．05）Blade技术信噪比明显高于常规技术；中度伪影组各眼眶分区内Blade技术信噪比与常规技术比较无统计学差异；重度伪影组眼球区（t=-4．917，P〈0．05）、视神经鞘区（Z=-4．687，P〈0．05）和骨膜外区（Z=-3．431，P〈0．05）Blade技术信噪比明显高于常规技术。结论Blade技术可提高眼眶扫描中图像的信噪比，且在同一伪影程度组中不同眼眶分区的信噪比差异有区别。

Blade and conventional technology of signal-to-noise ratio in orbital MRI scans of impact analysis

Objective To study Blade technology artifacts occurrence, improvement in image quality and orbital partitions artifacts degree on Blade image correction techniques through comparative analysis between conventional technology and Blade technology in image SNR, image improvement and image classification. Methods Patients who conducted MRI scans of eyes in Armed Police General Hospital MRI Department from July 2012 to June 2013 were recruited as objects. Routine orbital Tse T2WI sequence scan exhibited different degree of involuntary motion artifact. There were ultimately 136 patients admitted. Using the German Siemens Trio Tim 3.0T superconductive magnetic resonance imaging system, all patients were scaned by conventional MRI and Blade technology in the location. Based on the artifacts degree of conventional MRI, 136 patients were divided into mild, moderate and severe artifacts groups. Obtaining the signal to noise ratio, the image quality grade and technical-image improving efficiency of two scanning images were com- pared to evaluate the improvement of image quality. Results Artifacts mild eye area （ t = 4. 159,P 〈 0.05 ） and periosteal groups outside the area （ t = - 4. 306,P 〈 0.05 ） Blade technology SNR was significantly higher than conventional techniques ; severe eye area artifact group （ t = - 4.917, P 〈 0.05 ）, nerve sheath region （ Z = - 4. 687, P 〈 0.05 ） and the outer region （ Z = - 3.431, P 〈 0.05 ） Blade technology periosteum SNR was significantly higher than that of conventional technology. Conclusions The Blade technology can significantly improve the SNR of the scanning image in eyes, and there are differences among different orbit partitions in the same degree of artifacts.