Abstract: Objective To investigate the application and value of MSCT multimodal three-dimensional (3D) reconstruction in cochlear implantation. Methods ① The membranous structures with 3D imaging of cochlea, vestibular, semicircular canal and temporal bone transparent imaging were constructed with a double threshold reconstruction technique, where the anatomical relationship between ossicles, inner ear and temporal bone were displayed. ② The facial nerve reconstruction displayed the path of the facial nerve. The ultrastructure showed the facial nerve, facial nerve recess, posterior wall of the external auditory canal and the structure of chorda tympani nerve and neighboring structures. ③ The distance between promontory plane vertical segment of the facial nerve and chorda tympani nerve was measured. Results Of the 83 patients recruited in this study, 11 had inner ear malformation. Of them, 2 had Mondini malformation, 2 had semicircular canal malformation, 2 had common cavity malformation, 1 had internal auditory canal stenosis, and 4 had enlarged vestibular aqueduct. The distance between normal structure of cape plane vertical segment of the facial nerve and chorda tympani nerve was 0.27±0.057 cm at the left-side and 0.28±0.068 cm at the right-side. An intact structure of the implanted electrodes was clearly showed in 5 patients in the post-operative examination. Conclusion The 3D multimodal reconstruction technique is useful in providing ultrastructure imaging of the middle and inner ear, which is important for surgeons in pre-and post-operative evaluations of the success and potential risk factors for performing cochlear implantation.

Key words: Three dimensional reconstruction of multimode, Cochlear implantation, Tomography, Temporal bone, X-ray computed, Multi-slice spiral CT, Facial nerve