磁感应介电常数法测量脑出血的可行性研究

Feasibility study of magnetic induction dielectric constant method for measuring cerebral hemorrhage

目的:探讨磁感应介电常数法测量脑出血的可行性。方法:基于电磁感应原理,搭建一个发射线圈和一个接收线圈,采用磁感应测量系统测量含有介电常数信息的扰动磁场相对于激励磁场的实部。通过物理实验测量植物油、蒸馏水、血液3种溶液(每种60 mL)的实部,验证该系统测量介电常数的可行性;通过动物实验测量实验兔脑注血过程中头部的实部变化,分析实部变化量与脑出血量之间的关系。结果:物理实验中3种溶液实部测量结果为血液>蒸馏水>植物油,与已知的3种溶液的介电常数大小吻合。动物实验中每只动物的实部变化量随着注血量的增加近似线性增大,且未注血时实部变化量远小于注血过程中的实部变化量。结论:磁感应测量的实部可以反映被测物的介电常数,通过测量介电常数的变化来反映脑出血量变化的方法是可行的。

Objective To explore the feasibility of magnetic induction dielectric constant method for measuring cerebral hemorrhage.Methods A transmitting coil and a receiving coil were constructed based on the principle of electromagnetic induction,and a magnetic induction measurement system was used to detect the real part of the perturbed magnetic field containing information on the dielectric constant relative to the excitation field.Physical experiments were conducted to measure the real parts of three solutions(60 mL each)of vegetable oil,distilled water and blood to verify the feasibility of the system to detect the dielectric constant.The relationship between the changes in the real part of the head and the amount of cerebral hemorrhage was analyzed by animal experiments measuring changes in the real part of the head during cerebral blood injection in experimental rabbits.Results The order of measurement results of the real parts of the three solutions in the physical experiment was as follows:blood,distilled water and vegetable oil,which was consistent with the known dielectric constants of the three solutions.The changes in the real part of each animal in the animal experiments increased approximately linearly with the amount of blood injected,and the real part without blood injection had the changes much smaller than that in the real part during blood injection.Conclusion The real part of the magnetic induction measurement can reflect the dielectric constant of the object being measured,and it is feasible to reflect the change in cerebral hemorrhage by measuring the change in dielectric constant.