眼内异物CT眼球横扫联合子午面重建定位法

Localization of intraocular foreign bodies by the combination of CT ocular axial scan and meridian plane reconstruction

目的 探讨眼内异物CT定位新方法。方法 筛选 2 6例后极以外眼球壁和视网膜表面粘连异物 ,予CT“眼球平扫”和“眼球横扫”后 ,分别行眼球横扫联合子午面重建定位法 (新法 )、眼球平扫联合眼球横扫定位法 (传统方法Ⅰ )和眼球平扫直角坐标定位法 (传统方法Ⅱ )定位。以术中间接检眼镜监视下定位或术中直接看到的异物位置为验证标准 ,分别测量依据以上 3种CT定位数据确立的异物球表定点位置的经、纬向误差。结果 2 6例异物球表定点位置的经、纬向平均误差分别为 1 5 3、1 64mm(新法 ) ,1 3 7、1 64mm(传统方法Ⅰ )和 2 0 2、2 5 5mm(传统方法Ⅱ )。经配对t检验 ,新法较传统方法Ⅰ差异无统计意义 (经向 :P >0 6,纬向 :P =1) ;新法较传统方法Ⅱ差异有统计意义 (经向 :P <0 0 5 ,纬向 :P <0 0 1)。结论 新法较传统方法更简便、更直观、更富发展前景。

ObjectiveTo explore a new compute tomography(CT) for the localization of intraocular foreign bodies(IOFB).MethodsAfter CT ocular horizontal and ocular axial scan,the foreign bodies on wall of eyeball or retinal surface in 26 eyes were localized by the combination of CT ocular axial scan and meridian plane reconstruction(new method),ocular horizontal scan and ocular axial scan(conventional method Ⅰ) as well as ocular horizontal scan right angle coordinate(conventional method Ⅱ).At the criteria of indirect ophthalmoscope localization and visual mornitoring during operation,the relative accuracies of corresponding points of the foreign bodies on sclera surface along meridian and parallel were measured.ResultsIn the 26 cases,the mean relative accuracies of corresponding points of foreign bodies on sclera surface along meridian and parallel were 1.53 mm /1.64 mm(new method),1.37 mm/1.64 mm(conventional method Ⅰ)and 2.02 mm/2.55 mm(conventional method Ⅱ),respectively.There were no statistical differences between the new method and the conventional method Ⅰ,and there was statistical differences between the new methods and the conventional method Ⅱ(along meridian:P<0.05;along parallel:P<0.01).ConclusionCompared with the conventional methods,the new one is simpler,more visible and more potential in the clinical usage.