正常中耳腔的CT仿真内窥镜技术

目的：探讨正常听骨链的CT仿真内窥镜(CTVE)成像技术方法及其对中耳结构显示程度。方法：15例无中耳疾病的健康人，层厚1mm、螺距1．0轴位薄层扫描，骨算法、0．1～0．2mm间隔重建，行CTVE成像，观察正常听骨链的情况。结果：采用CTVE技术，对锤骨、砧骨及锤砧关节及砧镫关节的显示率均能清晰的显示，砧镫关节呈“L”形。但镫骨底板和镫骨的前、后脚显示欠佳，约有1／3可以显示。结论：CTVE成像技术能很好地显示中耳腔内部的听骨链立体结构，特别是可以部分显示镫骨底板，该技术将在活体上对中耳腔形态及功能的研究有重要意义。

Application of CT virtual endoscopy(CTVE) on the normal middle ear

Objective: To explore the technique of CT virtual endoscopy (CTV E) on Ossicular chain and study its ability to display the normal middle ear.Met hods: Spiral CT scan of the middle ears was performed with 1.0mm slice thickness and 1.0 pitch in 15 normal subjects (30 ears). Bone algorithm and 0.1~0.2 mm re construction interval were adopted, while the ability of CTVE displaying the nor mal middle ear structures was analyzed. Results: It was completely revealed that malleus, anvil, malleus-anvil joint and incudostapedial joint could be demonstr ated clearly. Only in 30% cases, floorplate, anterior crus and posterior crus of stapes could be observed. Conclusions: CTVE technique can diplay stereoscopic i mage of middle ear, especially the floorplate of stapes. It will be important to study the form and the function of middle ear on living body.