中耳仿真内镜成像的临床应用研究

The clinical application of spiral CT virtual endoscopy of middle ear

目的:探讨CT仿真内镜(CTVE)显示中耳正常结构的方法,确立显示听骨链及其他中耳结构的位点和方法。方法:选择40例无耳科疾病的正常志愿者,采用德国西门子螺旋CT机Inner Ear扫描程序对正常志愿者进行轴位扫描,重建原始图像,用Fly-through软件经选择的A、B、C点入路进行CTVE成像研究。重点显示听骨链连接状态。结果:40例正常志愿者经选择的A、B、C点入路行CTVE中,锤骨、砧骨、鼓岬、面神经管水平段和外半规管隆凸显示率均为100%;圆窗、卵圆窗为90%、93%、98%,听小骨全貌为100%、95%、93%。结论:通过选择恰当的入路,CTVE在显示听小骨及其连接关系方面有相当优势。CTVE是断层影像的有力补充。

Objective：To explore the clinical application of CT virtual endoscopy （CTVE） of ossicular chain in middle ear,and to establish the accurate method of observing ossicular chain and middle ear anatomy. Method：Volume scanning with spiral CT unit was performed in forty normal cases without illness of ear. Endoscopic 3D processing was carried out on a separate workstation equipped with a flying through program. From three isolated points（A, B and C）, ear drum and ossicles were observed with CTVE method. The status of auditory ossicles connection were focused. Resalt..In CTVE via A, B and C points, the indication rates of the malleus, the indus, the drum cape, the canalis facialis horizontal section, and the prominence of horizontal semicircular canals were prosperously 100%. The indication rates of round window and the fenestra ovalis were 90%, 93%, 98% via A, B and C points respectively. And the indication rates of complete demonstration of ear ossicles were 100%, 95 %, 93 %, respectively. Conclusion： With appropriate approach, CTVE has advantage of showing ear ossicles and their connections, which is a good supplement of routine CT.