The investigation is designed to provide supporting evidence for the clinical safety of the Biotronik's new Implantable Cardioverter Defibrillator systems when used under specific 3 Tesla MR conditions .

Inclusion Criteria:

• Implanted with Implantable Cardioverter Defibrillator (ICD) system according to Clinical Investigational Plan (CIP)
• ICD system was implanted in the pectoral region
• Implantation at least 5 weeks prior to enrollment date
• Patient body height ≥ 140 cm
• Age ≥ 18 years
• Right Ventricular pacing threshold (at 0.4 ms) measurable and ≤ 2.0 V
• Written informed consent
• Able and willing to complete MRI testing
• Able and willing to complete all testing required by the clinical protocol
• Available for all follow-up visits at the investigational site

Exclusion Criteria:

• Standard contraindication for MRI scans
• Patient shows signs of a twiddler's syndrome, i.e. fiddles with implant
• Explantation, exchange or reposition of ICD or lead within 5 weeks prior to enrollment date
• Charging status of the battery is Elective Replacement Indicator (ERI) or End of Service (EOS)
• MRI scan within 5 weeks prior to enrollment date
• R-wave sensing amplitude < 6.5 millivolt
• Lead impedance less than 200 or greater than 1500 Ohm
• Life expectancy of less than six months
• Cardiac surgery in the next six months
• Pregnant or breastfeeding
• Participation in another interventional clinical investigation

The patients selected for participation should be from the investigator's general patient population according to the inclusion and exclusion criteria.