Woodard J C, Bertram C D, Gow B S
Med Biol Eng Comput. 1989 Jan;27(1):25-32. doi: 10.1007/BF02442166.
A finite-difference computer model has been used to determine the potential distributions arising from a dipole current source aligned parallel to the axis of bounding cylinders. The radial position of this source had large and nonlinear influence on the potentials along the dipole axis. The accuracy of the computer simulation was established from comparison with an analytic solution of a simple geometry. Measurements using a conductance catheter in saline-filled cylinders also demonstrated the dependence of the conductance on the radial position. The dependence of the potential distribution on the radial position of the dipole places limits on the ultimate accuracy of the conductance catheter technique when used for the measurement of ventricular volume. Radial movement of the catheter within the ventricular cavity, resulting in changes in the potential distribution, could explain some artefacts that appear on volume recordings from the conductance catheter.
一个有限差分计算机模型已被用于确定由与边界圆柱体轴线平行排列的偶极电流源产生的电位分布。该源的径向位置对沿偶极轴的电位有很大的非线性影响。通过与简单几何形状的解析解进行比较，确定了计算机模拟的准确性。在充满盐水的圆柱体中使用电导导管进行的测量也证明了电导对径向位置的依赖性。当用于测量心室容积时，电位分布对偶极径向位置的依赖性限制了电导导管技术的最终准确性。导管在心室腔内的径向移动，导致电位分布的变化，可以解释电导导管容积记录中出现的一些伪影。
