Barber D C
Department of Medical Physics and Clinical Engineering, Royal Hallamshire Hospital, Sheffield, United Kingdom.
Med Phys. 1989 Mar-Apr;16(2):162-9. doi: 10.1118/1.596368.
There has recently been an increasing interest in the possibility of producing images of electrical impedance within the human body. When an electric current is applied to the body of a voltage distribution is developed across the body surface. This distribution is in part dependent on the internal impedance distribution within the body and it is possible to estimate this distribution from a suitable set of voltage measurements. Because of the nonlinear relationship between the impedance distribution and the voltage distribution at the surface of the body, the reconstruction problem is much more difficult than for other tomographic imaging techniques, but a significant amount of progress has been made, and it is now possible to produce tomographic images of in vivo distributions of impedance, albeit with low spatial resolution. Future developments should improve image quality.
最近，人们对生成人体内部电阻抗图像的可能性越来越感兴趣。当电流施加到人体上时，会在体表形成电压分布。这种分布部分取决于体内的内部阻抗分布，并且可以从一组合适的电压测量值中估计出这种分布。由于阻抗分布与体表电压分布之间存在非线性关系，重建问题比其他断层成像技术要困难得多，但已经取得了显著进展，现在已经能够生成体内阻抗分布的断层图像，尽管空间分辨率较低。未来的发展应该会提高图像质量。
