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目的 通过对正常人脑组织对称部位CT值的测量差值研究,寻求正常参考值,以探讨其在超急性期脑梗死CT诊断中的应用价值。方法 用常规CT扫描对 33例神经系统正常志愿者的 7处脑组织对称部位分别进行CT值测量,计算差值(ΔHU)共 231个,对所测得数据进行统计学分析得出正常参考值,将其与经临床追踪证实的超急性期脑梗死组 30例 (33个可疑病灶)的对称部位CT值差值进行比较。结果 正常人脑组织对称部位CT值测量差值的正常参考值平均为M=0. 39(ΔHU),四分位数间距Q=0. 48(ΔHU),最大值为 1. 79 (ΔHU),最小值为 0. 00 (ΔHU);病变组CT值测量差值平均为M=3. 62(ΔHU),Q=2. 44(ΔHU),最大值 8. 34(ΔHU),最小值 1. 2(ΔHU)。正常组 7处脑组织对称部位差值均值与病变组比较,有显著性差异 (Ρ<0. 01)。结论 正常组的CT值测量差值 96. 97%为 1. 2 (ΔHU)以下,是异常组的最小值,正常组的最大值 1. 8 (ΔHU)。应用正常中老年人脑组织对称部位平扫CT值测量差值对评价超急性期脑梗死有重要参考价值。
Objective To study the difference of CT value of normal human brain symmetry and seek the normal reference value to explore the value of CT in the diagnosis of hyperacute cerebral infarction. Methods Thirty-two normal volunteers with normal nervous system (CT) were used to measure the CT value of seven symmetrical parts of brain tissue respectively. 231 differential ΔHU values were calculated. Statistical analysis of the measured data showed that the normal reference value , Which was compared with CT value of symmetry in 30 cases (33 suspicious lesions) of hyperacute cerebral infarction confirmed by clinical trail. Results The normal reference value of the difference of the CT value of normal human brain symmetry was M = 0.39 (ΔHU), the interquartile range was Q = 0.48 (ΔHU) and the maximum value was 1.79 (ΔHU) , The minimum value was 0. 00 (ΔHU); the difference between the CT values of the lesion group averaged M = 3.62 (ΔHU), Q = 2.44 (ΔHU), the maximum value of 8. 34 . 2 (ΔHU). Normal group 7 Department of brain tissue symmetry difference between the mean and lesion group, there was a significant difference (P <0.01). 8 (ΔHU) .Conclusion The normal group of CT value measurement difference of 96.97% is 1.2 (ΔHU) below, is the minimum abnormal group, the normal group of maximum 1. 8 (ΔHU). Application of normal symmetry in the elderly brain CT scan value differences in the evaluation of hyperacute cerebral infarction have important reference value.