为了非侵入性地定位不寻常的心脏活动,一个人必须建立一个与心脏相关的预先预测模型,躯干,和探测器。该模型必须构造为与心脏的几何和功能活动数学相关。有几种方法可用于对正向问题中的先前源进行建模,这导致了铅字段
矩阵生成。在传统技术中,铅字段假设固定的先前
来源,并且假定源矢量方向平行于探测器平面
,所有方向的单位强度。然而,不能总是期望异常发生在相同的位置和方向,导致误解和误诊。为了克服这一点,
这项工作提出了一种使用同一主题的VCG信号构建的新的正向模型。此外,在&#xD中使用了三种转换方法来提取VCG;构建随时间变化的前导场以转向源的方向,而不是
只是在反问题中重建其活动。此外,抽取
急性缺血患者的单位VCG环,观察与正常受试者相比的变化。
异常条件是通过将去极化时间减少15ms来实现的。涉及VCG单位向量的
结果证明了心脏
源取向的各向异性性质,提供有关心脏电活动的信息。
To localize the unusual cardiac activities non-invasively, one has to build a prior forward model that relates the heart, torso, and detectors. This model has to be constructed to mathematically relate the geometrical and functional activities of the heart. Several methods are available to model the prior sources in the forward problem, which results in the lead field matrix generation. In the conventional technique, the lead field assumed the fixed prior sources, and the source vector orientations were presumed to be parallel to the detector plane with the unit strength in all directions. However, the anomalies cannot always be expected to occur in the same location and orientation, leading to misinterpretation and misdiagnosis. To overcome this, the work proposes a new forward model constructed using the VCG signals of the same subject. Furthermore, three transformation methods were used to extract VCG in constructing the time-varying lead fields to steer to the orientation of the source rather than just reconstructing its activities in the inverse problem. In addition, the unit VCG loop of the acute ischemia patient was extracted to observe the changes compared to the normal subject. The abnormality condition was achieved by delaying the depolarization time by 15ms. The results involving the unit vectors of VCG demonstrated the anisotropic nature of cardiac source orientations, providing information about the heart\'s electrical activity.