结论通过CT测量可以方便、精确地计算岩矢角的大小，对于头颅复杂部位的特殊摄影，提高耳部及岩骨等病变的影像诊断具有较高的价值。
Conclusion The PSA can be accurately calculated by CT measurement, it has very important value in the imaging diagnosis of ear and petrous bone diseases for the head radiography.
方法：采用干性颅骨18具，福尔马林固定的头颅标本12具分别进行骨窗及乳突孔的定位测量和桥小脑角结构距骨窗的距离测定。
Methods: The location of bony "window" and mastoid foramen were studied , and the distance from bony "window" to cerebellopontine angle was measured on 18 dry and 12 wet cranial bones.
方法：采用干性颅骨18具，福尔马林固定的头颅标本12具分别进行骨窗及乳突孔的定位测量和桥小脑角结构距骨窗的距离测定。
Methods: The location of bony "window" and mastoid foramen were studied , and the distance from bony "window" to cerebellopontine angle was measured on 18 dry and 12 wet cranial bones.
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