From the case: Constrictive pericarditis
Four chamber "Grid" sequence
One frame of the grid cine sequence: The green arrow points to the gridline through the pericardium. The red arrow points to the gridline through the myocardium. The left ventricle is in early systole, but notice how the pericardium and myocardium are "tethered" at the angle of the line rather than becoming discontinuous.