低场磁共振在人工耳蜗植入术前评估中的应用初探

The Initial Application of Low Field MRI in Pre-operation Assessment for Artificial Cochlear Implantation

目的探讨低场磁共振在人工耳蜗植入术前评估中的应用价值。资料与方法使用GE Signa Excite0.35T永磁磁共振系统对拟行人工耳蜗植入术的24例患儿行常规MRI检查排除脑内病变,内耳三维稳态进动快速成像(3D-FIESTA)扫描,并对原始图像进行后处理,重组为二维或三维图像。结果14例28耳良好地显示内耳及迷路的形态结构。内耳发育畸形5例7耳,内听道发育畸形3例5耳,大前庭导水管综合征2例3耳,合并脑白质病变3例。结论低场磁共振能够清晰地显示内耳的解剖结构,在人工耳蜗植入术前评估中具有重要价值,可以帮助临床选择适合的植入耳,减少手术风险。

Objective To investigate the value of low field MRI in pre-operation assessment for artificial cochlear implantation. Materials and Methods Twenty-three cases performed MR examinations by GE SIGNA EXCITE 0. 35T MR system before artificial cochlear implantation operation. Conventional brain scan was used to exclude the intracranial diseases. 3D-FIESTA axial and T2WI coronal scan of inner ear were reconstructed by MIP, MPR and VR methods. Results MR findings showed normal structure of cochlear nerve and labyrinth in 14 cases （28 ears） , ochlear malformations in 5 cases （7ears） , internal auditory canal malformations in 3 cases （ 5 ears） , vestibular and cochlear aqueduct enlargement in 2 cases （3 ears） , and brain white matter disease in 3 cases. Conclusion Low field MRI is able to display anatomy of internal ear clearly and play an important role in pre-operation assessment. It can help doctor to select suitable ear and reduce risks of operation.