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3.0T MRI去除脊柱金属植入物伪影的临床可行性研究

Feasibility of reducing artifacts of spine metal implants at 3.0 T MRI

摘要:

目的 探讨3.0T MRI去除脊柱金属植入物伪影的临床可行性.方法 前瞻性对29例脊柱术后金属植入物患者(颈椎15例、腰椎14例)分别行3.0T MRI常规序列及去金属伪影(WARP)序列扫描.对比分析WARP序列和常规序列图像质量评分(5级评分法)、伪影显著区图像的信噪比及对比噪声比、扫描时间.采用配对t检验(正态分布的计数资料)和Mann-Whitney(非正态分布)秩和检验,分别用于图像信噪比及对比信噪比和图像质量定性评分的对比,P<0.05为差异有统计学意义.结果 WARP序列图像变形较常规序列明显减轻;伪影的信噪比及对比噪声比低于常规序列(P均<o.05).颈椎和腰椎WARP序列图像质量评分[4(3~5)和4(3~5)分]均高于常规序列[3(2~4)和3(2~4)分](P均<0.05);颈椎检查时间(14 min 9 s)较常规序列(13 rain 5 s)增加64 s(8.2%),腰椎检查时间(13 min 41 s)较常规序列(13 min 50 s)减少9 s(1.1%).结论 3.0 T MRI WARP序列可以有效减轻脊柱金属植入物伪影,扫描时间无明显延长.

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abstracts:

Objective To investigate the feasibility of reducing spine metal artifacts with metal artifacts reduction technique (WARP) at 3.0 T MRI.Methods This study included 15 cervical and 14 lumbar spine cases.The image quality of WARP sequences and conventional sequences were compared (5 score evaluation scale) as well as the signal to noise ratio (SNR) and contrast noise ratio (CNR) of the image artifacts.The scanning time was recorded.Paired-t test and Mann-Whitney test were used respectively to compare the SNR and CNR,and qualitative scoring between the two sequences.P<0.05 was considered to indicate a significant difference.Results The image distortion and blur of the WARP sequences were obviously reduced as compared to the conventional sequences.The SNR and CNR of artifacts of the WARP sequences were lower than that of the conventional sequences (All P<0.05).The image quality scores of WARP sequences in cervical and lumbar spines[4(3 to 5) and 4(3 to 5)] were higher than that of conventional sequences[3(2 to 4),3(2 to 4)](P<0.05).The scanning time of cervical spines in WARP sequence(14 min 9 s) was increased by 64 s (8.2%),and the time of lumbar spines (13 min 41 s) decreased by 9 s (1.1%).Conclusion The WARP sequences at 3.0 T could effectively reduce the artifacts of metallic prosthesis in cervical and lumbar spine without prolonging the scanning time at 3.0 T MRI.

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