发生过程中内皮细胞由厚变薄，血管平均截面积逐渐减小，管腔的体密度增大；
During development, the endothelial cells thinned , the average profile area of the vessels reduced and the volume density of vascular lumen increased gradually.
目的探讨直肠癌彩色血流平均密度(MCVD)与TNM分期、微血管密度(MVD)的关系。
Objective To explore the relationship of the mean color vessels density (MCVD) with TNM stage and pathologic microvessel density (MVD) in rectal cancers.
对照组第一次治疗前与第一次治疗后8周比较，平均血管密度和平均血管直径无统计学差异。
In control group, there is no statistical difference in terms of the mean vessel density and diameter of port wine stain between 8 weeks after and before the first treatment.
结果：未治疗的鲜红斑痣皮损处与同一患者正常皮肤比较，平均血管密度和平均血管直径均较大，有统计学差异。
Results: the mean vessel density and diameter of port wine stain lesion is statistically more than those of normal skin.
结果：未治疗的鲜红斑痣皮损处与同一患者正常皮肤比较，平均血管密度和平均血管直径均较大，有统计学差异。
Results: the mean vessel density and diameter of port wine stain lesion is statistically more than those of normal skin.
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