听眦线与前后联合间线关系的核磁共振研究

目的探讨听眦线（OML）作为脑立体定向手术颅内靶点定位体表扫描基线的可行性。方法采用1．5T高清MRI图像测量105例接受立体定向手术的患者前后联合连线（AC-PC）与OML、大脑长轴、丘脑长轴的夹角，分析OML与AC-PC、大脑长轴、丘脑长轴的关系及其他体表参考线基线与AC-PC的关系。结果AC-PC与OML成向下（10．17±1．46）°夹角，大脑长轴与OML成向下（9．77±1．57）°夹角，丘脑长轴与OML成向下（9．84±1．64）°夹角，大脑长轴、丘脑长轴与AC-PC基本平行。结论OML为较理想的功能神经外科定位用体表参考线，具有标志明确、操作简单的优点。

A MRI study of the relationship between the orbitomeatal line and anterior-posterior commissure line

Objective To explore the possibility of orbitomeatal line （OML） used as MRI scanning base line for stereotaetic functional neurosurgery. Methods The length of anterior commissure- posterior commissure （AC-PC） line, cerebral length （distance from the frontal pole to occipital pole）, cerebral width, the shape of the brain （cerebral width/cerebral length）, and the angles between AC-PC line and OML, AC-PC line and the cerebral length-axis, AC-PC line and thalamic length-axis were measured on MR images in 105 patients with intracranial lesions undergoing stereotactic neurosurgery. The angles between everyone of the other three extraeranial reference lines and AC-PC line were measured and compared. The relationships of OML with AC-PC, cerebral length axis and tharamie length axis, and the relationships of angle between AC-PC line and OML with the brain parameters were analyzed. Results ①The angle between AC-PC line and OML was （10.17±1.46）°. The angle between the OML and the cerebral length-axis was （9.77±1.57）°. The angle between the OML and the tbalamie length axis was （9.84± 1.64）°. AC-PC line is parallels to the cerebral length axis and the thalamic length-axis. ②The length of AC-PC line was （22.1 ± 1.3）mm （ranged from 19.5 to 25.1 mm）. Conclusion The OML is a good extracranial reference line for stereotactic neurosurgery on MRI scanning.