Influence on magnetic resonance image of posteiror titanium cervical internal fixation system / 中国矫形外科杂志

ABSTRACT

[Objective]To discuss the influence of posterior cervical titanium internal fixation system on magnetic resonance image(MRI).[Method]Six cases that had operated in Changhai hospital with posterior cervical titanium internal fixation system performed MRI scan.The MRI system were 1.0-T or 1.5-T scanner.Patients all performed sagital T1,T2 and axial T1-weighted image scan under turbo spin echo(TSE)sequence,then the artifacts and its influence on the MRI image were analyzed.[Result]Mean artifact size ranged from 2 to 3 times of actual screw size.The artifact was similar to the primary shape of internal fixation system with low intensity signal on center and high intensity signal on the margin.The details in the spinal canal can be distinguished.The rod had small artifact,but the laminar hook had large artifact which obscured the posterior structure of spinal canal,and the artifact of pedicle screw had influence on lateral spinal canal,nerve root and vertebral artery.[Conclusion]Patients with posterior cervical titanium internal fixation system should choose Turbo spin echo(TSE)sequence for MRI scan,if the spin echo is performed,the TE should be minimized.