Eyüboglu B M, Brown B H, Barber D C
University of Sheffield, Department of Medical Physics and Clinical Engineering, Royal Hallamshire Hospital, UK.
Clin Phys Physiol Meas. 1988;9 Suppl A:71-7. doi: 10.1088/0143-0815/9/4a/013.
Impedance variations within the thorax related to cardiac activity have been localised using cardiac gated electrical impedance images. Since quantitative measurements of local variations can be made from those images, electrical impedance tomography gives more valuable information than impedance cardiography (ICG). However, because of the three-dimensional (3D) and non-uniform nature of the sensitivity function, localised measurements from electrical impedance tomography (EIT) scans are related to the position and geometry of the regions in which a resistivity change occurs. For accurate determination of volume changes from conductivity variations, the 3D sensitivity distribution needs to be known.
与心脏活动相关的胸部内阻抗变化已通过心脏门控电阻抗图像进行定位。由于可以从这些图像中进行局部变化的定量测量，电阻抗断层成像比阻抗心动图（ICG）能提供更有价值的信息。然而，由于灵敏度函数的三维（3D）和非均匀性质，电阻抗断层成像（EIT）扫描的局部测量与电阻率变化发生区域的位置和几何形状有关。为了从电导率变化准确确定体积变化，需要知道三维灵敏度分布。
