基于坐标变换迭代拟合法的生物电阻抗模型参数提取方法研究  

A Study of Coordinates Transform Iterative Fitting Method to Extract Bio-impedance Model Parameters

作　　者：周黎明[1] 杨玉星[1] 袁世英[1] 

机构地区：[1]华中科技大学生命科学技术学院生物医学工程系,武汉430074

出　　处：《生物医学工程学杂志》2006年第1期56-59,共4页Journal of Biomedical Engineering

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。A new algorithm, the coordinates transform iteratlve optimizing method based on the least square curve fitting model, is presented. This arithmetic is used for extracting the bio-lmpedance 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 Ri,Re,Cm and a, has been realized rapidly and accurately. With the aim at lowering the power consumption, decreasing the price and improving the price-toperformance 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 Ri increased largely with an increase in working load during sitting, which reflects the ischemic change of lower limbs.

关 键 词：生物电阻抗频谱 电阻抗模型参数 坐标变换迭代拟合法 双CPU测量系统 下肢组织缺血实验 

分 类 号：R311[医药卫生—基础医学]