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The 3DQRS detection principle; (a) geometric representation of cardiac voltage sources observed within the MRI bore relative to the position of the surface leads V1–V6, (b) formation of a typical 3DQRS complex, (c) QRS of sinus rhythm outside the MRI in an Idiopathic Outflow Tract (IOT) PVC patient, (d) VMHD at 3T, (e) PVC outside the MRI in an IOT PVC patient.
