共同性内斜视患者眼眶MRI成像中直肌坐标值及横截面积动态变化的研究

Dynamic changes of rectus coordination and cross-sectional area in orbit MRI of patients with concomitant esotropia

目的:用MRI研究共同性内斜视患者内外直肌在眼眶中的静态位置及舒缩运动时的变化,观察共同性内斜视患者中是否存在内外直肌的位置和功能异常。方法:应用眼球动态MRI技术,获取6例共同性内斜视患者在原在位及眼球水平方向转动时的冠状位磁共振图像,应用计算机图像测量软件对原在位时内外直肌横截面中心相对眼眶中心的坐标值;眼球内外转时,观察内外直肌最大横截面积所在平面面积的变化。同时设立正常对照组,将两组结果进行统计学比较。结果:共同性内斜视患者内外直肌在眼眶的位置较正常人无显著差异,共同性内斜视患者和正常人内外直肌最大横截面积位于眼球-视神经交接面后6mm,眼球内外转时,内外直肌最大横截面积的变化在两组无显著性差异。结论:内外直肌的位置和功能异常可能没有参与共同性内斜视的发生。

AIM： To study the rectus coordination in primary position on the orbital MRI and the rectus cross-section changes when they contract and relax on the ocular dynamic MRI in patients with concomitant esotropia. METHODS： Images of ocular dynamic MRI scan were obtained in primary, left and right gaze in six patients with concomitant esotropia and six normal cases. The coordination in primary position and the rectus crosssection changes in the plane of 6mm posterior to the eyeball-optic nerve plane were measured with computer software on the images of coronal MRI when the eye looked right and left. The results in the two groups were compared. RESULTS. There was no significant difference between patients with concomitant esotropia and normal cases with regard to either the coordination in primary position or the rectus cross-section changes in the plane of 6mm posterior to the eyeball-optic nerve plane when the eye looked right and left. CONCLUSION ： The abnormality in position and function of medial and lateral rectus might not be involved in the pathogenesis of concomitant esotropia.