基于磁共振DTI与MIP后处理的膝部神经三维成像显示
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摘要
目的利用最大信号强度投影(MIP)对膝部周围神经扩散张量成像(DTI)原图行三维重建,探讨不同扩散敏感梯度方向数(MPGs=6、25)成像效果的差异。方法对32名健康志愿者膝部行DTI扫描,MPGs设为6个方向(MPGs=6)、25个方向(MPGs=25)两组。以两种DTI原图行三维MIP重建:(1)DTI序列自动生成T_2-weighted Trace(T_2-WT)图像;(2)垂直神经走行长轴方向(垂直方向)的图像。由两名医师处理图像行可视化评价。结果同一种DTI原图MPGs=6、25两组三维MIP重建膝部神经成像质量差异无统计学意义(P>0.05);MIP成像评分垂直方向图像明显高于T_2-WT图像(P<0.01)。结论 MPGs=6、25 DTI序列垂直方向图像三维MIP重建均能清晰地显示膝部神经,前者评定周围神经效率高,T_2-WT图像MIP三维重建显示膝部神经欠清晰。
Objective To achieve 3-dimensional(3 D) display of peripheral nerves in the knee region by using MIP post-processing methods. To reconstruct original images acquired by DTI scan,and the nerve imaging quality was discussed between scan schemes with two different Motion probing gradients numbers(MPGs=6,25) of diffusion directions. Methods DTI scans were performed in 6(MPGs=6) and 25(MPGs=25) diffusion directions on the knee region of 32 healthy young volunteers. The MIP post-processing methods employed 2 types of DTI original images:(1)T_2-weighted trace(T_2-WT) imaging by DTI sequence automatic generation.(2)The traveling direction of vertical nerve(vertical direction). Two radiologists processed the images and evaluated these images visually. Results There is no obvious significant statistical difference comparing MPGs=6 and MPGs=25 imaging quality scores of each MIP post-processing method(P>0.05). The imaging quality of vertical direction MIP post-processing was better than that from T_2-WT imaging(P<0.01). Conclusion Three-Dimensional displays of peripheral nerves in the knee region can be achieved by MIP post-processing for vertical direction images between MPGs =6,25,but not clear by T_2-WT imaging restructing. Adopting 6-direction DTI scan using MIP post-processing is an efficient method for the peripheral nerves of the knee region.
Objective To achieve 3-dimensional(3 D) display of peripheral nerves in the knee region by using MIP post-processing methods. To reconstruct original images acquired by DTI scan,and the nerve imaging quality was discussed between scan schemes with two different Motion probing gradients numbers(MPGs=6,25) of diffusion directions. Methods DTI scans were performed in 6(MPGs=6) and 25(MPGs=25) diffusion directions on the knee region of 32 healthy young volunteers. The MIP post-processing methods employed 2 types of DTI original images:(1)T_2-weighted trace(T_2-WT) imaging by DTI sequence automatic generation.(2)The traveling direction of vertical nerve(vertical direction). Two radiologists processed the images and evaluated these images visually. Results There is no obvious significant statistical difference comparing MPGs=6 and MPGs=25 imaging quality scores of each MIP post-processing method(P>0.05). The imaging quality of vertical direction MIP post-processing was better than that from T_2-WT imaging(P<0.01). Conclusion Three-Dimensional displays of peripheral nerves in the knee region can be achieved by MIP post-processing for vertical direction images between MPGs =6,25,but not clear by T_2-WT imaging restructing. Adopting 6-direction DTI scan using MIP post-processing is an efficient method for the peripheral nerves of the knee region.
引文
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8 Skorpil M,Karlsson M,Nordell A.Peripheral nerve diffusion tensor imaging[J].Magn Reson Imaging,2004,22:743-745.
9王小娟,潘征,韩峰,等.DTI联合DTT对外伤致胫神经损伤的应用研究[J].临床放射学杂志,2017,36:866-870.
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11丁文全.基于磁共振弥散张量成像与多种后处理方法的上肢神经形态学研究[D].江苏:苏州大学,2014.
12 Zhao L,Wang G,Yang L,et al.Diffusion-weighted MR neurography of extremeity nerves with unidirectional motion-probing gradients at 3T:feasibility study[J].AJR,2013,200:1106-1114.
2 Takagi T,Nakamura M,Yamada M,et al.Visualization of peripheral nervede ge neration and regeneration:monitoring with diffusion tensor tractography[J].Neuroimage,2009,44:884-892.
3 Skorpil M,Karlsson M,Nordell A.Peripheral nerve diffusion tensor imaging[J].Magn Reson Imaging,2004,22:743-745.
4 Hiltunen J,Suortti T,Arvela S,et al.Diffusion tensor imaging and tractography o f distal peripheral nerves at 3 T[J].Clin Neurophysiol,2005,116:2315-2323.
5 Guggenberger R,Nanz D,Bussmann L,et al.Diffusion tensor imaging of the median nerve at 3.0 T using different MR scanners:agreement of FA and ADC measurements[J].Eur J Radiol,2013,82:e590-596.
6 Zhou Y,Kumaravel M,Patel VS,et al.Diffusion tensor imaging of forearm nerve s in humans[J].J Magn Reson Imaging,2012,36:920-927.
7 Tagliafico A,Calabrese M,Puntoni M,et al.Brachial plexus MR imaging:accura cyand reproducibility of DTI-derived measurements and fibre tractography at 3.0-T[J].Eur Radiol,2011,21:1764-1771.
8 Skorpil M,Karlsson M,Nordell A.Peripheral nerve diffusion tensor imaging[J].Magn Reson Imaging,2004,22:743-745.
9王小娟,潘征,韩峰,等.DTI联合DTT对外伤致胫神经损伤的应用研究[J].临床放射学杂志,2017,36:866-870.
10 Skorpil M,Engstrfm M,Nordell A.Diffusion-direction-dependent imaging:a novel MRI approach for peripheral nerve imaging[J].Magn Reson Imaging,2007,25:406-411.
11丁文全.基于磁共振弥散张量成像与多种后处理方法的上肢神经形态学研究[D].江苏:苏州大学,2014.
12 Zhao L,Wang G,Yang L,et al.Diffusion-weighted MR neurography of extremeity nerves with unidirectional motion-probing gradients at 3T:feasibility study[J].AJR,2013,200:1106-1114.
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