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目的探讨容积重建技术(VR)对耳部疾病的应用价值并与其他几种后处理技术做比较。方法采用多排螺旋CT(MSCT)机,对15例耳部听力下降患者进行超薄层(0.5mm)、超高分辨率扫描,其中10例又行增强扫描,对扫描图像行间隔为0.1mm的密集重建,在此基础上进行VR和MPR、SSD、VE、RaySum、MIP/MinIP重建,比较各种重建技术对耳部病变及其周围肿瘤侵犯听小骨和内耳等结构的显示能力。结果VR对耳部病变及其周围肿瘤对听小骨和内耳等结构是否侵犯均可清晰显示,按显示清晰度次序,依次为VR,MPR,SSD,MIP/MinIP。RaySum和VE分别仅对内耳和听小骨病变显示效果好。结论MSCT超薄层、超高分辨率扫描,VR重建优于其他类型重建,能获得中内耳各微细复杂结构的立体图像,可非常直观而深入地观察耳部各种病变,清晰地显示肿瘤对中耳听小骨、内耳膜迷路和内听道内面听神经等结构累及情况。
Objective To investigate the value of Volume Reconstruction (VR) for ear diseases and to compare with several other post-treatment techniques. Methods Fifteen cases of ear hearing loss were scanned by ultrathin layer (0.5mm) and ultra-high resolution scanning with multi-slice spiral CT (MSCT) machine. Among them, 10 cases underwent enhanced scanning with interval of 0.1mm Based on this, reconstruction of VR, MPR, SSD, VE, RaySum and MIP / MinIP was performed. The reconstruction ability of various structures such as auditory ossicles and inner ear was evaluated by comparing various reconstruction techniques. Results VR could clearly show whether the ear lesions and surrounding tumors were infiltrating the structures such as the ossicles and the inner ear. VR, MPR, SSD and MIP / MinIP were shown in the order of clarity of display. RaySum and VE, respectively, only for the inner ear and small bony lesions showed good results. Conclusion MSCT ultra-thin layer, ultra-high resolution scan and VR reconstruction are superior to other reconstruction methods and can obtain three-dimensional images of the complex structures in the inner ear. The ear lesions can be observed directly and deeply and the tumor pairs The middle ear listens to the small bones, the inner ear membrane is lost and the internal auditory nerve inner structure is involved.