磁探测电阻抗成像呼吸监测仿真研究

Simulation research of respiratory monitoring with magnetic detection electrical impedance tomography

为了探索磁探测电阻抗成像应用于肺部呼吸监测中的可行性,针对新型磁探测电阻抗成像技术的正问题,以真实人体肺部数据构建成像体物理模型,采用了有限元方法得到成像体内部的电势和电流密度分布,然后根据毕奥-萨伐尔定律分别获得呼气末与吸气末成像体外部的磁感应强度仿真数据。结果表明,吸气末时成像体周围的磁感应强度值比呼气末小8.875%。研究结果显示了呼吸时由于肺容积、电导率的不同而导致周围磁感应强度的差异等信息,为后续磁探测电阻抗成像的图像重建以及临床疾病检测奠定了基础。

In order to explore the feasibility of applying magnetic detection electrical impedance tomography （MDEIT） on respiratory monitoring, aiming at the forward problem of magnetic detection electrical impedance tomography, we calculated the electric potential and current density distribution inside the imaging object by using the finite element method. We then got magnetic induction intensity outside the object at the end of exhaling and inhaling according to Biot-Savart＇s law. The results showed that the magnetic induction intensity at the end of inhaling was 8.875%, less than that at the end of exhaling. By the simulation results, we could understand the difference of magnetic induction intensity value surrounding the lung at the end of exhaling and inhaling due to the change of lung volume and electrical conductivity distribution better. Our research laid the foundation for the late image reconstruction and clinical disease detection.