We study scaling features in the reactions of cereral blood vessel network to sudden “jumps” in peripheral arterial pressure in rats. Using laser speckle contrast imaging (LSCI) to measure the relative velocity of cerebral blood flow (CBF) and detrended fluctuation analysis (DFA) for processing experimental data, we investigate distinctions in the responses of veins and capillaries. To quantify short-term reactions associated with transients, we propose an extension of the conventional DFA approach, which estimates an additional scaling exponent reflecting the effect of nonstationarity. We also consider the ability of characterizing vascular dynamics with multifractal DFA in terms of the degree of multiscality. Based on statistical analysis, we report significant distinctions in the responses of small network of microcerebral blood vessels compared to veins such as the sagittal sinus, which are quite insensitive to variations in peripheral blood circulation.

我们研究了大鼠血管网络对周围动脉压突然“跳跃”反应的缩放特征。使用激光斑点对比成像（LSCI）来测量脑血流的相对速度（CBF）和去趋势波动分析（DFA）以处理实验数据，我们研究了静脉和毛细血管反应的区别。为了量化与瞬态相关的短期反应，我们提出了传统DFA方法的扩展，该方法估计了反映非平稳性影响的附加缩放指数。我们还考虑了用多分形DFA表征血管动力学的能力。根据统计分析，