【摘要】 本文研究了用于电阻抗成像（ＥＩＴ）图像重建的快速计算梯度向量的方法，在此基础上提出了实现ＥＩＴ的一种新的图像重建算法，即组合变尺度法。该算法的突出优点是与初始值选取无关、计算量小、具有整体收敛性、并具有较高的收敛速度。尤其当电极个数和像素个数增加时，它的计算量的增长速度较其他常用算法要慢得多。更多还原

【Abstract】 A fast algorithm is investigated to calculate gradient vector for image reconstruction of electrical impedance tomography. Based on this, a new image reconstruction algorithm named combined vairable metric method is proposed. The most important advantage of this algorithm is the property of independent initial value, small amount of calculations, the global convergency and higher convergence speed. Especially, the increase speed of calculation amount of this algorithm is much slower than others when the number of electrods and pixels are increasing.更多还原