Abstract: Objective　To investigate the effect of 3D reconstruction, lumbosacral plexus's display and image anatomical measurement of 3D-T2W-FFE, 3D-STIR-TSE and DWIBS sequences.　Methods 　Data of 49 volunteers underwent conventional lumbar spine MRI and lumbosacral plexus neurography, including 48 cases of 3D-T2W-FFE, 47 cases of 3D-STIR-TSE and 43 cases of DWIBS sequence were collected. The contrast to noise ratio of nerve root and muscle (CNR N/M), the nerve root diameter and ganglion volume of the right sacral of the three sequences were calculated. The lumbosacral plexus's display effect and 3D reconstruction effect were evaluated and compared by different  grade 4 scores respectively.　Results　The CNR N/M of the three sequences were not identical, there were statistical differences among the 3D-T2W-FFE sequence, the 3D-STIR-TSE and DWIBS sequences (P<0.05), there was no significant difference in ganglion volume among the three sequences (P=0.050). The nerve roots diameter of the three sequences were not identical, there were statistical differences between the 3D-STIR-TSE sequence and the DWIBS sequence(P<0.05). There was no statistical difference in neural 3D reconstruction score of the three sequences (P=0.025).　Conclusions　There is no statistical difference in the neural display and imaging anatomical score of 3D-T2W-FFE sequence and 3D-STIR-TSE sequence, which is better than DWIBS sequence. There is no statistical difference in the neural 3D reconstruction score of the three sequences, which the DWIBS sequence is easiest to achieve during reconstruction.  

Key words: Lumbosacral plexus, 　Magnetic Resonance Neurography, 　3D reconstruction, 　Image signal,  ,  , Image anatomy