脑出血磁感应实时监测系统的建立

Constitution of a Real-time Monitoring System of Cerebral Hemorrhage with Magnetic Induction

脑出血的实时监测能够极大地降低其致残率和致死率,本文基于磁感应相位移原理,结合硬件滤波放大模块、PXI数据采集系统和LabVIEW软件,采用带通采样和相关法鉴相,建立了脑出血的实时监测系统,并通过盐水模拟脑出血实验和兔子脑出血实验测试及评估系统性能。系统测量单次相位差的时间约为0.030 4s;相位差变化值与盐水和血液的体积都成正比,实验结果与理论一致。结果表明,该系统能够实时监测出脑出血的进展情况,并且系统造价低,体积小,鉴相精度高,反应灵敏,具有较好的应用前景。

The real-time monitoring of cerebral hemorrhage can reduce its disability and fatality rates greatly.On the basis of magnetic induction phase shift,we in this study used filter and amplifier hardware module,NI-PXI data-acquisition system and LabVIEW software to set up an experiment system.We used Band-pass sample method and correlation phase demodulation algorithm in the system.In order to test and evaluate the performance of the system,we carried out saline simulation experiments of brain hemorrhage.We also carried out rabbit cerebral hemorrhage experiments.The results of both saline simulation and animal experiments suggested that our monitoring system had a high phase detection precision,and it needed only about 0.030 4sto finish a single phase shift measurement,and the change of phase shift was directly proportional to the volume of saline or blood.The experimental results were consistent with theory.As a result,this system has the ability of real-time monitoring the progression of cerebral hemorrhage precisely,with many distinguished features,such as low cost,high phase detection precision,high sensitivity of response so that it has showed a good application prospect.