Patient specific anatomic parameters taken from the cardiac magnetic resonance examination will be the base for a semiautomatic model incorporating the conductivity of the heart, the lungs, blood and the torso. For this reason, a software package (AMIRA Developer, TGS Template Graphics Software, France) has been adapted to calculate a quasi static approximation of Maxwell equations.~After fusion of the T1 CMR scan and the ECG electrodes a model-based bidomain FEM is used for a step-wise measurement of the local activation times (resting potential: 290 mV; plateau: 0 mV; acceleration time: 3 ms) both Ende- and epicardially.
The principal aim is to analyze total left and right ventricular activation time in different CRT device programming algorithms (SyncAV) measured by non-invasive electrophysiology