Khambete N, Metherall P, Brown B, Smallwood R, Hose R
Department of Medical Physics, University of Sheffield Royal Hallamshire Hospital, United Kingdom.
Ann N Y Acad Sci. 1999 Apr 20;873:534-42. doi: 10.1111/j.1749-6632.1999.tb09502.x.
In this paper, we discuss issues involved in defining an optimum placement of four electrodes for impedance pneumography. We observed a general trend where the change in impedance (delta Z) decreased while the sensitivity (delta Z/Z) increased with distance between the drive and receive electrode pairs. However, the theoretical study indicated that delta Z/Z should decrease with distance. The scatter of points in the plots indicated that sensitivity was influenced by factors other than distance. The correlation coefficient between the theoretical and measured delta Z/Z was low, but significant. This suggested that the best electrode configuration can be derived from the theoretical data. High delta Z/Z was obtained when the drive and receive electrode pairs were placed close to the lungs and in different horizontal planes.
在本文中，我们讨论了为阻抗式肺量计定义四个电极的最佳放置所涉及的问题。我们观察到一个总体趋势，即随着驱动电极对和接收电极对之间距离的增加，阻抗变化量（ΔZ）减小，而灵敏度（ΔZ/Z）增加。然而，理论研究表明ΔZ/Z应随距离减小。图中各点的离散情况表明，灵敏度受距离以外的因素影响。理论和实测的ΔZ/Z之间的相关系数较低，但具有显著性。这表明最佳电极配置可从理论数据中得出。当驱动电极对和接收电极对靠近肺部且处于不同水平面时，可获得较高的ΔZ/Z。
