Red blood cell (RBC) aggregation is the reversible adhesion of RBCs among themselves. We previously reported a positive correlation between blood glucose level and the degree of RBC aggregation (the brightness of the B-mode image). In the present study, we investigated the contribution to the brightness according to the deviation from the central axis in measurements along with the long-axis view of the vein. The results show that the brightness changed significantly for a slight change in the lateral position in the short-axis image. We found that the stability of the measurements was not guaranteed in the long-axis view and estimated the correct analysis window range for the short-axis view.

红细胞 (RBC) 聚集是红细胞之间的可逆粘附。我们之前报道了血糖水平与 RBC 聚集程度（B 模式图像的亮度）之间存在正相关关系。在本研究中，我们根据测量中与中心轴的偏差以及静脉的长轴视图研究了对亮度的贡献。结果表明，短轴图像中横向位置稍有变化，亮度就会发生显着变化。我们发现在长轴视图中无法保证测量的稳定性，并为短轴视图估计了正确的分析窗口范围。