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利用核磁共振图像(MRI)中提取的人体和心脏边界,根据边界元方法(BEM)建立了一个考虑左、右心房和心室的多腔体心脏磁场模型.分析了用该模型得到的36通道心脏磁场数据和特定时刻的磁场图.并在此基础上,研究了完全性右束支传导阻滞(CRBBB)和完全性左束支传导阻滞(CLBBB)病人ST-T段的心脏电活动.结果显示,用移动单电流偶极子模拟的单束支电兴奋传导所产生的磁场图与用超导量子干涉器(SQUID)测量的CRBBB/CLBBB病人数据绘制的心脏复极时的心磁图(MCG)十分相似.结果表明,该多腔体心脏BEM模型可用于CLBBB/CRBBB病人心脏磁场逆问题的研究.此外,文中给出了两个评价指标:测量平面上多腔体与单腔体的心脏磁场强度极大值之比,以及两种模型的36个测量点上磁场强度均方根之比.分析表明,多腔体心脏模型更贴近人体心脏的实际情况.该模型中心脏组织电导率参数的取值,以及等效电流偶极子的位置和个数决定了磁场的强度和分布.
Using the extracted human and cardiac boundaries from MRI, a multi-cavity cardiac magnetic field model considering the left and right atriums and ventricles was established according to the Boundary Element Method (BEM). The 36-channel heart obtained from this model Magnetic field data and magnetic field map at a specific time.On the basis of this study, we investigated the cardiac electrical activity in ST-T segments of patients with complete right bundle branch block (CRBBB) and complete left bundle branch block (CLBBB). The results show that the magnetic field generated by a single beam of epidural conduction simulated by a moving single-current dipole versus the magnetocardiogram of a repolarised heart plotted by CRBBB / CLBBB patient data measured with a superconducting quantum interference device (SQUID) (MCG) .The results show that this multi-chamber heart BEM model can be used to study the inverse problem of heart magnetic field in CLBBB / CRBBB patients.In addition, two evaluation indexes are given in this paper: the multi-cavity and single-cavity And the rms ratio of the magnetic field strength at 36 points of the two models.The analysis shows that the multi-cavity heart model is more close to the actual condition of the human heart.In this model, the conductance of cardiac tissue Rate parameter values to And the equivalent current dipole position and the number determines the strength and distribution of the magnetic field.