Selected transformation methods and their comparison for VCG leads deriving

Vondrak, Jaroslav; Penhaker, Marek; Jurek, Frantisek

doi:10.1016/j.aej.2021.08.068

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…The phase angle between the static and time varying orientations for normal and abnormal cases at time instants t = 30 ms, 80 ms and 150 ms is tabulated in table 2. For the variation in the activation time by 15 ms, the generated lead field was able to provide the The authors in [19,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] worked on the VCG, another great medical technique for the non-contact detection of heart problems. The KRT method is the most common and accurate approach to obtain X and Y leads.…”

Section: Resultsmentioning

confidence: 99%

“…VCG is a diagnostic method that provides information about the electrical activity of the heart, representing the vector's spatial orientation and magnitude at every moment [21]. The VCG can be extracted from the standard 12-lead ECG system in clinical applications, employing the VCG transformation matrices [22][23][24]. Kors regression transformation method (KRT), Inverse Dower transformation (IDT), Q Least Square Value Transformation (QLSV), P Least Square Value Transformation (PLSV), and Kors quasi-orthogonal transformation are some of the methods used to extract VCG from the measured ECG signals based on transformation matrices [22,23,25,26].…”

Section: Proposed Vcg Based Lead Fieldmentioning

confidence: 99%

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Forward problem of electrocardiography based on cardiac source vector orientations

Bhat,

2024

Biomed. Phys. Eng. Express

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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 field 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 reducing 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.

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Section: Resultsmentioning

confidence: 99%

Section: Proposed Vcg Based Lead Fieldmentioning

confidence: 99%

Forward problem of electrocardiography based on cardiac source vector orientations

Bhat,

2024

Biomed. Phys. Eng. Express

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“…One of the most commonly used transformation methods is IDT and Kors regression method. More and more studies point to more accurate results based on the use of the Kors regression method [21] , [34] – [37] . QLSV transformation is specialized mainly in a certain part of the ECG (QRS complex).…”

Section: Discussionmentioning

confidence: 99%

Statistical Evaluation of Transformation Methods Accuracy on Derived Pathological Vectorcardiographic Leads

Vondrak

Penhaker

2022

IEEE J. Transl. Eng. Health Med.

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Objective: Vectorcardiography (VCG) as an alternative form of ECG provides important spatial information about the electrical activity of the heart. It achieves higher sensitivity in the detection of some pathologies such as myocardial infarction, ischemia and hypertrophy. However, vectorcardiography is not commonly measured in clinical practice, and for this reason mathematical transformations have been developed to obtain derived VCG leads, which in application in current systems and subsequent analysis can contribute to early diagnosis and obtaining other useful information about the electrical activity of the heart. Methods and procedures: The most frequently used transformation methods are compared, namely the Kors regression method, the Inverse Dower transformation, QLSV and the Quasi-orthogonal transformation. These transformation methods were used on 30 randomly selected records with a diagnosis of myocardial infarction from the Physikalisch-Technische Bundesanstalt (PTB) database and their accuracy was evaluated based on the calculation of the mean square error (MSE). MSE was subjected to statistical evaluation at a significance level of 0.05. Results: Based on statistical testing using the nonparametric multiselective Kruskall-Wallis test and subsequent post-hoc analysis using the Dunn method, the Kors regression as a whole method achieved the most accurate transformation. Conclusion: The results of statistical analysis provide an evaluation of the accuracy of several transformation methods for deriving orthogonal leads, for possible application in measuring and evaluation systems, which may contribute to the correct choice of method for subsequent analysis of electrical activity of the heart at orthogonal leads to predict various diseases.

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Comparison of Rotation of Vectorcardiograms from Inverse Dower and Kors Transformation Matrices

Fuzinato,

de Aguiar Hortegal,

Meneghelo

et al. 2024

IFMBE Proceedings

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Selected transformation methods and their comparison for VCG leads deriving

Cited by 8 publications

References 33 publications

Forward problem of electrocardiography based on cardiac source vector orientations

Forward problem of electrocardiography based on cardiac source vector orientations

Statistical Evaluation of Transformation Methods Accuracy on Derived Pathological Vectorcardiographic Leads

Comparison of Rotation of Vectorcardiograms from Inverse Dower and Kors Transformation Matrices

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