感音神经性耳聋的64层VCT扫描重建技术

VCT manifestations of sensorineural hearing loss

目的:研究感音神经性耳聋(SNHL)患者的64层VCT扫描表现,提高对其认识。方法:对50例感音神经性耳聋(SNHL)患者行64层VCT扫描,原始数据采集完后,按层厚0.625mm,重建间隔0.2mm,单侧FOV9.6cm放大重建,再传至工作站行多平面重建(MPR)、容积漫游(VR)及其叠加技术等后处理方法观察内耳结构。结果:MPR清晰显示听小骨长轴,半规管、前庭、前庭窗、耳蜗、蜗窗和内听道的骨性解剖结构;MPR图像可同层显示面神经管的鼓室段和垂直段;VR三维立体图像直观显示半规管、前庭、前庭窗、耳蜗、蜗窗、面神经、面神经隐窝和内听道的膜性立体图像。在MPR图像上面神经管垂直段距外耳道后壁的平均距离左、右侧分别为4.46mm、4.53mm;面隐窝底距面神经管的平均距离左、右侧分别为1.02mm、1.03mm。结论:64层VCT扫描结合后处理技术能清楚显示先天性内耳畸形的部位和程度并明确其分类,为电子耳蜗的植入提供依据,可作为首选的影像检查方法。

Objective:To discuss VCT manifestations of sensorineural hearing loss and to make a further understanding of the disease.Methods:Fifty patients with sensorineural hearing loss(SNHL) were examined by VCT.The axial images of each ear were reconstructed with a field of view of 9.6cm.Then the reconstructed data were sent to workstation and done with multi-planar reformation(MPR) and volume rendering(VR).Results:MPR could clearly display skeleton anatomic structures of the auditory ossicle,semicircular canal,vestibule,vestibular window,cochlea,cochlea window and internal auditory canal.MPR could show the tympanic segment and vertical segment of the aquaeductus fallopii on the same slice.VR technology showed three-dimentional membrane structions of semicircular canal,vestibule,vestibular window,cochlea,cochlea window and internal auditory canal.The left and right average distances between the aquaeductus fallopii vertical segment and the posterior wall of acoustic duct were 4.46mm and 4.53mm,respectively.The left and right average distances between the bottom of facial crypt and the aquaeductus fallopii were 1.02mm and 1.03mm,respectively.Conclusion:VCT can clearly show the sites and the degree of various congenital inner ear abnormalities together with MPR,MinIP and VR reconstructions.It is very useful to the cochlear implantation,and therefore,should be considered as the imaging examination of choice.