摘要
目的对比7T和3T MRI双回波稳态(DESS)序列对膝关节周围神经及神经束的显示效能。资料与方法纳入2022年7月—2025年3月陆军军医大学第一附属医院14名健康志愿者进行3T和7T MRI扫描,扫描序列包括三维双回波稳态(3DDESS)和层内空间分辨率更高的双回波稳态(DESSHR)。测量图像及组织信噪比(SNR)、对比噪声比(CNR)。使用五点式Likert量表评估两组定性指标,并评价定性测量结果的一致性。结果基于3T MRI的3D-DESS序列腓神经的SNR低于7T(t=2.913,P=0.011),其余SNR差异无统计学意义(t=-0.564、-0.843、1.424,P>0.05)。基于7T MRI 3D-DESS序列腓神经/脂肪的CNR(t=2.490,P=0.027)、DESSHR序列神经/脂肪的CNR高于3T(t=3.354、7.467,P<0.01);3D-DESS序列胫神经/脂肪的CNR(t=-4.162,P=0.001)以及DESSHR序列胫神经/肌肉的CNR(t=-4.358,P=0.001)低于3T。7T的DESSHR和3DDESS序列图像质量更高(平均差分别为0.139、1.000;Χ^(2)=4.765、70.000,P<0.029、P<0.001),且膝关节周围神经成像均更清晰(平均差0.717~2.071;Χ^(2)=66.000、62.000、68.000、23.684、60.000、58.000、61.000、58.000,P<0.001);3T的DESSHR序列图像伪影较少(平均差-0.785;Χ^(2)=47.078,P<0.001)。5位评估者评估定性测量结果一致性较好(Kappa=0.67~0.85,P<0.001)。结论与3T MRI相比,基于7T的DESS序列能更好地显示腓总神经、胫神经、隐神经及其神经束。
Purpose To compare the effectiveness of double-echo steady state(DESS)sequences at 7T and 3T MRI in peripheral nerves and nerve fascicles around the knee joint.Materials and Methods Fourteen healthy volunteers in the First Affiliated Hospital of Army Medical University from July 2022 to March 2025 were selected for 3T and 7T MRI scans,which included three-dimensional dual-echo steady state(3D-DESS)and dual-echo steady state with higher in-plane spatial resolution(DESSHR).Image and tissue signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)were measured.Qualitative metrics were assessed using a five-point Likert scale,and consistency of qualitative measurements was evaluated.Results The SNR of the peroneal nerve using the 3D-DESS sequence on 3T MRI was significantly lower than that on 7T MRI(t=2.913,P=0.011),while there were no statistically significant differences in SNR between other sequences(t=-0.564,-0.843,1.424,all P>0.05).The CNR of the peroneal nerve/fat using the 3D-DESS sequence on 7T MRI(t=2.490,P=0.027)and the DESSHR sequence(t=3.354,7.467,both P<0.01)was significantly higher than that of 3T MRI.However,the CNR of the tibial nerve/fat using the 3D-DESS sequence(t=-4.162,P=0.001)and the CNR of the tibial nerve/muscle using the DESSHR sequence(t=-4.358,P=0.001)were significantly lower on 7T MRI than those on 3T MRI.The image quality of both the DESSHR and 3D-DESS sequences on 7T MRI was significantly superior than those of on 3T MRI(mean differences:0.139,1.000;c2=4.765,70.000,P<0.029,P<0.001),with clearer imaging of nerves around the knee(mean differences:0.717-2.071;c2=66.000,62.000,68.000,23.684,60.000,58.000,61.000,58.000,all P<0.001);the DESSHR sequence on 3T MRI had fewer artifacts than that on 7T MRI(mean difference:-0.785;Χ^(2)=47.078,P<0.001).The qualitative measurement results were consistently evaluated by five assessors with good agreement(Kappa=0.67-0.85,P<0.001).Conclusion Compared with 3T MRI,the DESS sequence based on 7T can better visualize the common peroneal nerve,tibial nerve,saphenous nerve and their nerve bundles.
作者
黎子龙
虞烽伟
陈品珍
陈伟
LI Zilong;YU Fengwei;CHEN Pinzhen;CHEN Wei(7T Magnetic Resonance Translational Medicine Research Center,the First Affiliated Hospital of Army Medical University,Chongqing 400038,China;Department of Radiology,the First Affiliated Hospital of Army Medical University,Chongqing 400038,China)
出处
《中国医学影像学杂志》
北大核心
2025年第5期467-473,共7页
Chinese Journal of Medical Imaging
基金
重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0919)。
关键词
磁共振成像
膝关节
超高场强
双回波稳态序列
周围神经
一致性
Magnetic resonance imaging
Knee joint
Ultra-high field
Double-echo steady state sequence
Peripheral nerves
Consistency
