医用磁感应阻抗成像敏感性基础研究

在设计并实现了1个16通道的磁感应阻抗成像系统的基础上，为了研究成像算法，考察了测量信号的幅度和相位与被测物的位置之间的关系。基于成像系统，采用高精度鉴幅和鉴相的方法进行信息提取。得到了感应信号的幅度与相位沿水平和竖直方向的变化规律，绘制了敏感性变化曲线。结果表明：测量位置不同，检测到的感应信号有很大变化，变化趋势是有规律的，对这种规律的研究有利于更好地重建图像。

Fundamental study on sensitivity of medical magnetic inductive impedance imaging

A 16-channel magnetic inductive impedance imaging system is developed. The relation between the amplitude, phase of the detected signal and the subject position is studied. High-precision techniques for amplitude discrimination and phase discrimination are applied to information acquisition. The changing rule of the amplitude and phase of the sensing signal along horizontal and vertical directions is determined, and thus the sensitivity curve is achieved. It's proved that detected signals vary regularly with different positions, and the study on regulation is useful for image reconstruction.