人体躯干模型中肺的存在对体表电位分布的影响

在所建三维人体躯干模型的基础上，给出了如何应用边界元方法对非均匀人体场域进行求解。在设定心外膜电位分别呈现为单偶极子和双偶极子时，求出相应非均匀场域中的体表电位分布，并将它们与相同情况下均匀场域的体表电位分布进行分析比较。结果表明：躯干模型中肺的存在虽然对体表电位中极值的大小和位置没有太大影响，但却较大程序地改变了整个体表电位的分布状况，具体地说，就是由于肺的存在使得体表电位值较均匀时的相对误差高

EFFECTS OF LUNGE ON THE BODY SURFACE POTENTIALSIN A REALISTIC TORSO MODEL

A realistic 3-D torso model, which includes the heart and lung and retains the relative size and position of them within the body, was used to test the effects of the lung on body surface potentials. The boundary element method was used to construct a transfer matrix relating the epicardial potentials to the body surface potentials, for the inhomogeneous form of the model. The body surface potentials were obtained from the assumed epicardial potentials with a dsingle ipole or double dipoles in the inhomogeneous field respectively, and compared with those in the homogeneous field. The results show that although the lung has very little effect on the maximal potential and the minimal one at the same nodes, they changed the potentials of other nodes seriously. In the other words, the relative errors of the body surface potentials between the fields attain to 73.6%, and the correlative coefficient is 0.851.