Akademik Veri Yönetim Sistemi
50th Computing in Cardiology, CinC 2023, Georgia, Amerika Birleşik Devletleri, 1 - 04 Ekim 2023
The standard approach for the inverse problem of ECG computes the potentials on the epicardial or endo-epicardial surface. For localization of premature ventricular contractions (PVC), the point with the earliest activation time is considered the PVC origin. A point potential approach assumes that at the beginning of the PVC signal, only a small area of the ventricles is activated. The inverse localization of the PVC origin using a homogeneous and inhomogeneous torso and two methods (standard and point) for epicardial potentials was performed on the measured body surface potential maps of ten patients. The true PVC location and the patient-specific torso geometry from the CT scan were known. The localization error (LE) between estimated and true PVC origins for both methods was evaluated and compared. For the homogeneous torso and the standard method, the mean LE was 37.2pm 15.9 mm and 37.6pm 17.delta mm for epicardial and endo-epicardial surfaces, respectively. The corresponding values for the point method were 25.6pm 10.5 mm and 31.2pm 16.5 mm. For the inhomogeneous torso and the standard method, the mean LE was 38.6pm 18.9 mm and 31.3pm 11.1 mm. The mean LE improved to 2 7.6pm 7.2mm and 29.5pm 9.6 mm, respectively, for the point method. The assumption of a single-point equivalent electrical generator improved the LE for PVC origin localization.