摘要
目的 研究成人正常视交叉的MRI解剖及其毗邻结构。方法 6 5例受检者 ,男 31例 ,女 34例 ;年龄 18～ 72岁 ,平均 4 2 3岁。均行横断、冠状和矢状面T1W扫描和矢状T2 W扫描 ,2 0例行横断面T2 W扫描 ,2 0例行冠状面T2 W扫描。分别测量视交叉的横径、高度、前后径、视交叉 -鞍结节间距、视交叉与枕骨大孔前后径夹角及颅内段视神经的夹角 ,并观察视交叉的层面形态及其毗邻结构。结果 (1)横断面上视交叉的横径为 (13 0± 1 7)mm ,冠状面上横径为 (13 5± 1 7)mm。视交叉高度为 (3 1± 0 5 5 )mm。视交叉前后径为 (8 6± 0 93)mm。视交叉 -鞍结节间距为 (3 1± 1 7)mm。视交叉与枕大孔前后径的夹角为 (38 3± 8 4 )°。两侧颅内段视神经夹角为 (6 5 6± 8 5 )°。所有测量结果按男女分组进行统计学分析 ,男女之间没有显著统计学差异。 (2 )视交叉的毗邻 :视交叉上方为第 3脑室 ;两侧为颈内动脉 ;前上方为大脑前动脉 ;前方为额叶直回 ;后方为漏斗、灰结节和乳头体 ;下方为垂体和蝶窦。结论 MR能很好地显示视交叉的形态及其毗邻 ,并能准确地测量视交叉的大小。
Objective To investigate the MRI anatomy of the optic chiasm and its adjacent structures in normal adults.Methods The study included 65 adults, 31 males and 34 females, 18 to 72 years, and averaging 42.3 years.All 65 patients were studied using T_1WI at axial, coronal, and sagittal sections and T_2WI at sagittal sections, 20 adults were also scanned with T_2WI at axial section, and 20 at coronal sections.The transverse diameter, the height, the anteroposterior diameter, chiasm-tuberculum distance, the angle between the optic chiasm and anteroposterior diameter of foramen magnum, and the angle between bilateral intracranial optic nerves were measured, respectively.The shape in the sections and its anatomic relationship were also investigated.Results (1) In axial sections, the transverse diameter was (13.0±1.7) mm and (13.5±1.7) mm in coronal sections.The height was (3.1±0.55) mm.The anteroposterior diameter was (8.6±0.93) mm.The chiasm-tuberculum distance was (3.1±1.7) mm.The angle between the optic chiasm and the anteroposterior diameter of the foramen magnum was (38.3±8.4)°.The angle between bilateral intracranial optic nerves was (65.6±8.5)°.All the results divided by sex did not yield any significant differences.(2) The adjacent structures: The third ventricle located superiorly, the internal carotid arteries were on each side, the anterior cerebral arteries passed anterosuperiorly, the gyrus rectus of frontal gyrus was in the front, the pituitary stalk, the tuber cinereum, and mammillary bodies located posteriorly, and the pituitary gland and sphenoidal sinus located inferiorly.Conclusion The shape and its anatomic relationship of the optic chiasm can be well shown on MR images, the size can be measured accurately with MRI.
出处
《中华放射学杂志》
CAS
CSCD
北大核心
2004年第2期165-169,共5页
Chinese Journal of Radiology
