优化扫描技术对鼻咽和颈部MRI联合增强扫描图像质量的影响

Effect of Image Quality of Combining Nasopharynx and Neck Enhanced MRI by Optimizing Scan Technology

目的探讨优化鼻咽癌患者鼻咽和颈部磁共振成像(Magnetic Resonance Imaging,MRI)联合增强T1WI脂肪抑制(T1Weightedimagingfatsuppression,T1WI FS)序列扫描技术对图像质量的影响。方法回顾性分析60例(A组)鼻咽癌患者联合平扫及增强扫描的图像质量,评估其对组织结构观察结果的影响,然后针对影响图像质量的问题来源,优化、验证扫描序列或序列参数,最后采用χ^2检验及Fisher确切概率法分析60例(B组)序列优化前后扫描的图像质量、组织结构改善等方面的差异。结果A组58例、B组57例纳入分析,共115例平扫序列未见明确图像质量问题;A组、优化前B组影响组织结构观察的图像质量问题主要为T1WI FS序列的磁敏感伪影(Magnetic Sensitive Artifact,MSA)、血管搏动伪影(Vascular Pulsation Artifact,VPA)和脂肪抑制不均匀(Non-Uniformity Fat Suppression,NUFS);优化后B组57例MSA、VPA和NUFS明显改善,P值均<0.001。结论鼻咽和颈部MRI联合T1WI FS扫描多数存在MSA、VPA和NUFS等问题,可通过优化扫描序列或序列参数减少或消除,并提高诊断准确率或诊断信心。

Objective To explore the effect of optimizing nasopharyngeal and cervical magnetic resonance imaging(MRI)combined with enhanced T1 weighted imaging fat suppression(T1WI FS)serial scanning technology on image quality in patients with nasopharyngeal carcinoma.Methods A retrospective analysis of 60 cases of nasopharyngeal carcinoma patients(A group)combined plain scan and enhanced scan image quality,to evaluate its impact on the observation results of tissue structure,and then optimize and verify the scan sequence or sequence according to the source of the problem that affects the image quality.Finally,the chi-square test and Fisher exact probability method were used to analyze the difference in image quality and organization structure improvement of 60 cases(B group)before and after sequence optimization.Results 58 cases in A group and 57 cases in B group were included in the analysis.There were no clear image quality problems in A group and B group before optimization.The main problem of image quality in A group and B group before optimization was the magnetic sensitivity of T1WI FS sequence.Magnetic sensitive artifact(MSA),vascular pulsation artifact(VPA)and non-uniformity fat suppression(NUFS);57 cases of MSA,VPA and NUFS in B group were significantly improved after optimization,P values were all<0.001.Conclusion Nasopharyngeal and neck MRI combined with T1WI FS scans mostly have problems such as MSA,VPA and NUFS,which can be reduced or eliminated by optimizing the scan sequence or sequence parameters,and the diagnostic accuracy or diagnostic confidence can be improved.