Johnson J C, Lubow M, Stears J
Radiology. 1975 Mar;114(3):629-34. doi: 10.1148/114.3.629.
The addition of polytomography considerably increases the sensitivity of pneumoencephalography. The chiasmatic area lends itself particularly well to investigation by polytomoencephalography. In a series of 28 patients, the transverse dimension of the optic chiasm ranged from 4 to 20 mm, with a mean of 18 mm. The posterior portion of the chiasm tended to be U-shaped; its anterior portion's shape was that of a dumbbell. Intrachiasmatic tumors distort and enlarge the chiasm. The diaphragma sella is also particularly well evaluated by this technique. The study is safe, reliable, and can be repeated as needed.
多层面体层摄影术的加入显著提高了气脑造影术的敏感性。视交叉区域特别适合用多层面体层脑造影术进行检查。在28例患者中，视交叉的横向尺寸为4至20毫米，平均为18毫米。视交叉的后部呈U形；其前部呈哑铃形。视交叉内的肿瘤会使视交叉变形并增大。这种技术对视交叉池的评估也特别好。该研究安全、可靠，可根据需要重复进行。
