Brown B H, Barber D C
Sheffield University, Department of Medical Physics and Clinical Engineering, Royal Hallamshire Hospital, UK.
Clin Phys Physiol Meas. 1988;9 Suppl A:121-5. doi: 10.1088/0143-0815/9/4a/020.
We show that the surface potential profiles used for electrical impedance tomography are largely determined by body shape and to a much lesser extent by internal resistivity distribution. The results of 2D finite element modelling show that changes of profile amplitude greater than a factor of four can be expected for the thorax. This offers the possibility of determining body shape from surface potential profiles and hence the determination of static images. Some of the other problems and possibilities of impedance imaging are discussed and in particular the design of a system for real time cardiac gated imaging.
我们表明，用于电阻抗断层成像的表面电位分布在很大程度上由身体形状决定，而受内部电阻率分布的影响则小得多。二维有限元建模结果表明，胸部的电位分布幅度变化可能超过四倍。这为从表面电位分布确定身体形状从而确定静态图像提供了可能性。文中还讨论了阻抗成像的其他一些问题和可能性，特别是实时心脏门控成像系统的设计。
