方法：对101例正常成人骨性眼眶行双眶CT平扫和三维重建，测量眶下管长度、眶下孔到眶下缘的垂直距离、眶下孔到颅正中线的垂直距离、眶下管和上颌骨前壁夹角。每个数值测量5次，取平均值。采用SPSS 17.0统计软件进行处理。

结果：对101例正常成人骨性眼眶的测量结果进行统计分析。53例男性右侧眶下管长度的测量结果为12.97±2.63mm，左侧为13.21±2.73mm。48例女性右侧为12.72±2.70mm，左侧为12.79±2.77mm； 眶下孔到眶下缘的垂直距离的测量结果53例男性右侧为8.69±1.98mm，左侧为9.01±2.21mm。48例女性右侧为9.14±2.34mm，左侧为9.33±2.18mm； 眶下孔到颅正中线的垂直距离的测量结果53例男性右侧为33.34±3.33mm，左侧为33.41±3.01mm。48例女性右侧为32.33±3.78mm，左侧为32.39±4.23mm； 眶下管和上颌骨前壁夹角的测量结果53例男性右侧为(79.80±10.38)°，左侧为(81.47±11.70)°。48例女性右侧为(76.30±13.51)°，左侧为(76.04±14.64)°。男性左右侧所测得数值的比较和女性左右侧所测得数值的比较采用配对t检验； 男女同侧所测得数值的对比采用t检验，结果均无统计学差异(P>0.05)。

结论：通过CT对眶下神经走行的测量的研究，能更好为眶下神经相关疾病进行临床诊断和治疗，同时也避免手术中给患者造成不必要的神经损伤。

METHODS: Using three-dimensional reconstruction and CT, 101 adults with normal orbital bone were measured with the length of infraorbital canal, the vertical distance from infraorbital foramen to infraorbital margin and to median line of skull respectively, and the included angle between infraorbital canal and antetheca of the maxilla. The average had been taken after 5 times measurement to every value. SPSS 17.0 statistical software was used to the process.

RESULTS: Measurement results of 101 adults with normal orbital bone were statistically analyzed. The left infraorbital canal lengths of 53 male were 13.21±2.73mm and the right were 12.97±2.63mm; the left infraorbital canal lengths of 48 female were 12.79±2.77mm and the right was 12.72±2.70mm; the left vertical distances from infraorbital foramen to infraorbital margin of 53 male were 9.01±2.21mm and the right were 8.69±1.98mm; the left vertical distance from infraorbital foramen to infraorbital margin of 48 female were 9.33±2.18mm and the right was 9.14±2.34mm; the left vertical distances between infraorbital foramen and median line of skull of 53 male were 33.41±3.01mm and the right were 33.34±3.33mm; the left vertical distance between infraorbital foramen and median line of skull of 48 female were 32.39±4.23mm and the right were 32.33±3.78mm; the left included angle between infraorbital canal and antetheca of the maxilla of 53 male were 81.47°±11.70° and the right were 79.80°±10.38°; the left included angle between infraorbital canal and antetheca of the maxilla of 48 female were 76.04°±14.64° and the right were 76.30°±13.51°. Pair t test was used to compare the left and right side value in male and female, and the same side value in male and female. The results had no statistical differences(P>0.05).

CONCLUSION: Through the measure of the infraorbital nerve on CT, it is good for the clinical diagnosis and treatment. In the meanwhile, it can help patients to avoid the unnecessary nerve injury in the operating.