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目的:探讨眼内异物CT定位新方法。方法:筛选26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:26例异物球表定点位置的经、纬向平均误差分别为1.53mm、1.64mm(新法),1.37mm、1.64mm(传统方法Ⅰ)和2.02mm、2.55mm(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<0.05,纬向:P<0.01)。结论:新法较传统方法更简便、更直观、更富发展前景。
Objective: To explore a new method of CT localization of intraocular foreign body. Methods: Twenty-six cases of adhesion of the surface of eye wall and retina outside the posterior pole were screened. After CT scan and plain eye scan were performed, the eyeballs swept together with the meridional reconstruction method (the new method) Positioning method (conventional method Ⅰ) and the eye Cartesian coordinate positioning method (conventional method II) positioning. In order to verify the standard, the location of the foreign body in the indirect lens during surgery or the location of the foreign body directly seen in the surgery were used to measure the warp and weft errors of the fixed point position of the foreign object ball based on the above three kinds of CT location data respectively. Results: The average errors of latitude and longitude at the fixed position of the ball of 26 foreign objects were 1.53mm, 1.64mm (new method), 1.37mm, 1.64mm (traditional method I) and 2.02mm, 2.55mm (traditional method II) respectively. The paired t-test showed that there was no significant difference between the new method and traditional method I (warp: P> 0.6, weft: P = 1) P <0.01). Conclusion: The new method is more simple, more intuitive and more prosperous than the traditional method.