视神经管CT影像学测量和定位及其临床意义

The measurement,spatial stereotaxis and clinical significance of optical canal:Multi-slice spiral CT study

目的:探索准确测量和定位视神经管的影像学方法。方法:应用多层螺旋CT以骨质鼻尖-前床突为扫描基线对20具尸头标本行薄层扫描和解剖观察,验证影像学空间处理技术所测数据的准确性与视神经管立体定位实际符合率。结果:①骨质鼻尖-前床突扫描基线与视神经管走行基本一致;②影像学空间处理技术重建的视神经管定位标记线可全程显示在三维矢状位的鼻窦外侧壁上,与解剖观察情况一致;③眶口-鼻小柱距离、颅口-鼻小柱距离和视神经管内侧壁长度的解剖学和影像学测量值分别为(77.84±3.60)mm、(77.35±3.22)mm;(84.28±4.46)mm、(84.04±4.58)mm和(10.23±1.31)mm、(10.02±1.24)mm,两种测量值的差异无统计学意义(P>0.05)。结论:应用多层螺旋CT、骨质鼻尖-前床突扫描基线和空间处理技术能够准确对视神经管进行观测和空间定位。

Objective： To investigate a accurate mdiologic method for the measurement and spatial stereotaxis of optic canal. Methods：20 cadaveric skulls were scanned under Multi-slice spiral CT （MSCT） according to the baseline from nasal processus to clinoideus anterior. The imaging results of of optic canal and its adjacent structures were analyzed and compared with that of gross anatomy, for verifying the accuracy of the location of optic canal on CT. Results： （1）The scan plane from nasal processus to clinoideus anterior accorded with optic canal completely; （2）Locating mark of optic canal on MSCT images accorded with that of dissection results completely, which was all synchronously displayed by three-dimensional reconstruction images in the sagittal lateral wall of sinus; （3）The distances of orbital aperture to nasal columella, intracranial interior opening to nasal columella and the length of optic canal interior wall were （77.84±3.60）mm, （77.35±3.22）mm, （84.28± 4.46）mm, （84.04± 4.58）mm and （10.23±1.31）mm, （10.02±1.24）mm respectively. There was no significant difference for measured values between radiology and anatomy （P〉0.05）. Conclusions： By MSCT, the baseline from nasal processus to clinoideus anterior, and three-dimensional image workstations technology, we could precisely observe, measure and locate optic canal and it＇s adjacent structures.