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目的对正常人眼外直肌第一眼位以及在收缩和舒张状态下最大横截面积进行CT定量研究并分析其临床应用价值。资料与方法采用CT冠状位对16名正常人眼球在不同眼位状态下利用计算机图像处理软件进行眼外直肌最大横截面积测量,并对其进行数据分析,确定眼外直肌最大横截面积范围和其功能度。结果在第一眼位时,外直肌最大截面积和功能度均为最大,具有显著性差异(F=4.204,P=0.021);其余眼外直肌无显著性差异(F=2.562,P=0.0087)。内直肌最大截面积在收缩时比第一眼位状态下增加35.7%(36.72±4.69;26.86±3.66);松弛状态下减少29.6%(26.86±3.66;19.04±3.42)。外直肌最大截面积在收缩时比第一眼位状态下增加49.4%(54.89±5.05;34.74±4.08);松弛状态下减少30.7%(34.74±4.08;25.46±4.01)。上直肌群最大截面积在收缩时比第一眼位状态下增加28.3%(34.56±3.78;28.93±2.88);松弛状态下减少32.7%(28.93±2.88;18.13±3.48)。下直肌最大截面积在收缩时比第一眼位状态下增加27.4%(35.27±4.07;27.69±3.65);松弛状态下减少26.5%(27.69±3.65;20.36±3.75)。结论确立正常人眼外直肌在不同眼位状态下最大截面积和功能度正常值范围,为眼外肌病变提供影像学诊断和其临床意义。
Objective To study the CT quantitative study of the first ocular position of the lateral rectus abdominis and the largest cross-sectional area under systolic and diastolic conditions and analyze its clinical value. Materials and Methods CT coronal images were taken to measure the maximum cross-sectional area of rectus abdominis of 16 normal eyes under different eye positions using computer image processing software. Data analysis was performed to determine the maximum cross-section of the external rectus muscle Area and its functional area. Results In the first position, the maximal cross-sectional area and function of the lateral rectus muscle were the largest with significant difference (F = 4.204, P = 0.021). There was no significant difference in the other OTIs (F = 2.562, P = 0.0087). The maximal cross-sectional area of the rectus muscle increased by 35.7% (36.72 ± 4.69; 26.86 ± 3.66) and decreased by 29.6% (26.86 ± 3.66; 19.04 ± 3.42) in the relaxed state compared with that in the first position. The maximal cross-sectional area of lateral rectus muscle increased by 49.4% (54.89 ± 5.05; 34.74 ± 4.08) and decreased by 30.7% (34.74 ± 4.08; 25.46 ± 4.01) in the relaxed state compared with the first position. The maximum cross-sectional area of the upper rectus muscle increased by 28.3% (34.56 ± 3.78; 28.93 ± 2.88) and decreased by 32.7% (28.93 ± 2.88; 18.13 ± 3.48) in the relaxed state compared with the first position. The maximal cross-sectional area of the lower rectus muscle increased by 27.4% (35.27 ± 4.07; 27.69 ± 3.65) and 26.5% (27.69 ± 3.65; 20.36 ± 3.75) in the relaxed state when contracted. Conclusion The maximal cross-sectional area and normal range of function of the lateral rectus abdominis in different eye positions are established, which can provide imaging diagnosis and clinical significance for extraocular muscle lesions.