1. A method for patient-specific planning and guidance of electrophysiological interventions, comprising: generating a patient-specific anatomical heart model from cardiac image data of a patient; generating a patient-specific cardiac electrophysiology model based on the patient-specific anatomical heart model and patient-specific electrophysiology measurements; performing a virtual electrophysiological intervention using the patient-specific cardiac electrophysiology model; and calculating an electrocardiogram (ECG) signal in response to the virtual electrophysiological intervention.