各向同性MAVRIC-SL序列在经侧方入路腰椎融合术后去金属伪影的应用研究  

Application of isotropic MAVRIC-SL sequence in metal artifact reduction after lateral lumbar interbody fusion

作　　者：李海东 张润梅[2] 李建婷 赵轶波[3] 牛金亮[2] 赵斌[3] Li Haidong;Zhang Runmei;Li Jianting;Zhao Yibo;Niu Jinliang;Zhao Bin(College of Medical Imaging,Shanxi Medical University,Taiyuan 030001,China;Department of Radiology,the Second Hospital of Shanxi Medical University,Taiyuan 030001,China;Department of Orthopedics,the Second Hospital of Shanxi Medical University,Taiyuan 030001,China)

机构地区：[1]山西医科大学医学影像学系,太原030001 [2]山西医科大学第二医院放射科,太原030001 [3]山西医科大学第二医院骨科,太原030001

出　　处：《中华放射学杂志》2021年第9期923-928,共6页Chinese Journal of Radiology

基　　金：国家自然科学基金(82071898);山西省卫生健康委员会专项科技项目(2020-1)。

摘　　要：目的与快速自旋回波(FSE)序列及多次采集变频共振成像结合层面选择技术(MAVRIC-SL)序列比较,分析各向同性MAVRIC-SL(iso MAVRIC-SL)序列在经侧方入路腰椎融合术(LLIF)后对椎间孔及椎管的显示能力。方法前瞻性收集2020年5至6月山西医科大学第二医院30例LLIF术后患者,行矢状面MAVRIC-SL、iso MAVRIC-SL序列三维容积成像并重建横断面椎管层面图像,同时行FSE序列矢状面T1WI和横断面T2WI扫描。对3个序列的矢状面和横断面图像进行主观评分,矢状面图像主要评价对椎间孔的显示,横断面图像主要评价对椎管结构的显示,并测量伪影面积和伪影信噪比(SNR)。采用Friedman M检验比较3个序列图像质量评分和伪影面积、SNR的差异。结果30例LLIF患者3个序列间矢状面和横断面图像质量评分总体差异均有统计学意义(P均<0.001)。腰椎矢状面图像质量评分MAVRIC-SL[4(4,4)分]及iso MAVRIC-SL[4(4,4)分]均高于FSE序列T1WI[3(3,3)分,P均<0.001],MAVRIC-SL与iso MAVRIC-SL序列图像质量评分差异无统计学意义(P=1.000)。横断面图像质量评分iso MAVRIC-SL[5(5,5)分]高于MAVRIC-SL[4(4,4)分]及FSE序列T2WI[3(3,3)分,P均<0.05]。iso MAVRIC-SL序列矢状面和横断面图像伪影面积及伪影SNR均低于MAVRIC-SL及FSE序列(P均<0.05)。结论iso MAVRIC-SL序列可以有效减轻金属伪影,对LLIF术后椎管及椎间孔的显示优于MAVRIC-SL及FSE序列。Objective To compare the quality and diagnostic utility of the three sequences including fast spin echo(FSE),multi-acquisition variable resonance image combination selective(MAVRIC-SL),and isotropic MAVRIC-SL(iso MAVRIC-SL),in evaluating the intervertebral foramen and spinal canal in patients after lateral lumbar interbody fusion(LLIF).Methods Totally 30 patients after LLIF were enrolled prospectively from May to June 2020 in the Second Hospital of Shanxi Medical University.The patients underwent MRI of the lumbar spine including sagittal MAVRIC-SL and iso MAVRIC-SL sequence three-dimensional volume imaging,and the axial spinal canal level images were reconstructed.FSE sequence sagittal T1WI and axial T2WI images were acquired simultaneously.The sagittal and axial images were subjectively graded for visualization of the intervertebral foramen and spinal canal.The artifact area and SNR were measured.The Friedman M test was used to compare the differences in image quality scores,artifact area and SNR among the three sequences.Results Nonparametric test results showed significant differences in sagittal and axial image quality scores among the three sequences(both P<0.001).Sagittal image quality scores of MAVRIC-SL[4(4,4)points]and iso MAVRIC-SL[4(4,4)points]were higher than those of FSE T1WI sequence[3(3,3)points,both P<0.001].The quality scores of MAVRIC-SL and iso MAVRIC-SL showed no significant differences(P=1.000).The axial image quality score of iso MAVRIC-SL[5(5,5)points]were higher than those of MAVRIC-SL[4(4,4)points]and FSE T2WI[3(3,3)points,both P<0.05].The iso MAVRIC-SL images enabled a significantly improved reduction in the artifact area and SNR compared to the MAVRIC-SL and FSE sequence(all P<0.05).Conclusion The iso MAVRIC-SL acquisitions enhance visualization of the intervertebral foramen and spinal canal and decrease metal artifacts compared with MAVRIC-SL and FSE acquisitions.

关 键 词：磁共振成像 脊柱融合术 金属伪影 图像质量 

分 类 号：R687.3[医药卫生—骨科学]