【摘要】 研究了一种基于最小二乘模型的坐标变换迭代拟合新算法,可用于生物组织电阻抗模型参数的提取。与其它方法比较,此算法具有收敛速度快、数值拟合精度高等特点。实现了快速、精确地提取阻抗模型参数Ri、Re、Cm和α的目标。按照低功耗、低价位和高性能价格比的设计要求,设计了双CPU结构的生物电阻抗测量系统。初步实验结果表明,长期静坐引起肢体缺血使阻抗模型参数Ri显著上升,反映了下肢组织缺血的变化。更多还原

【Abstract】 A new algorithm,the coordinates transform iterative optimizing method based on the least square curve fitting model,is presented.This arithmetic is used for extracting the bio-impedance model parameters.It is superior to other methods,for example,its speed of the convergence is quicker,and its calculating precision is higher.The objective to extract the model parameters,such as R_i,R_e,C_m and α,has been realized rapidly and accurately.With the aim at lowering the power consumption,decreasing the price and improving the price-to-performance ratio,a practical bio-impedance measure system with double CPUs has been built.It can be drawn from the preliminary results that the intracellular resistance R_i increased largely with an increase in working load during sitting,which reflects the ischemic change of lower limbs.更多还原