This is a special kind of scan used to examine the structure of the heart and the nature of its muscle. It uses a magnetic resonance scanner that creates intense fluctuating magnetic fields around your body while you are inside the scanner. This generates the signals that make up the pictures produced. It may be useful for detecting structural heart disease especially if it is very subtle and may mimic a channelopathy (for example arrhythmogenic right ventricular cardiomyopathy (ARVC).