成人内耳结构多层螺旋CT三维成像方法初探

Preliminary study of multi-slice spiral CT 3D reconstruction in displaying adult inner ears

目的:探讨多层螺旋CT容积重建技术(VR)和最小密度投影+图像反转成像技术(MinIP+Invert)显示成人内耳结构的方法。方法:采用多层螺旋CT薄层扫描(层厚0.625mm)、小视野(FOV=50～80mm)、密集重建(间隔0.25mm),对25例正常成人内耳分别进行VR、MinIP+Invert三维成像。结果:VR、MinIP+Invert三维成像均清楚显示了内耳的解剖结构,并可同时观察内耳道内神经束及出内耳道底的前庭神经、蜗神经和面神经。VR操作较复杂,图像立体感强;MinIP+Invert操作相对简单,尤其对耳蜗、前庭的三维显示简捷明了。结论:VR与MinIP+Invert三维成像相结合能全面准确地观察内耳的解剖结构。

Objective： To study the techniques of displaying adult inner ears with multi-slice spiral CT imaging of volume rendering and minimum intensity projection plus inversion imaging technique. Methods： Multi-slice spiral scanning with 0.625mm slice thickness, 50-80mm field of view and 0.25mm reconstruction interval was performed in 12 adult inner ears. The 3D imaging of volume rendering and minimum intensity projection plus invert were used. Results： The 3D imagings of volume rending and minimum intensity projection plus inversion imaging could clearly display the anatomic structure of inner ear. The inner nerve bunch of inner ear canal, vestibular nerve, cochlear nerve and facial nerve also could be seen. The operation of volume rendering was more complicated than the operation of minimum intensity projection plus inversion technique, especially for cochlear and vestibular imaging. But the 3D images of volume rendering was clearer. Conclusion： the 3D reconstruction with volume rendering and minimum intensity projection plus inversion technique can display the anatomic structures fully and precisely.