Contour sharpness measurement.

Measurement of the contour sharpness was performed by placing a straight line above the heart connecting the myocardium of the left and the right ventricle, taking great care to avoid the inclusion of any perfusion defects or blooming artefacts into the measurement. Thus, we included 4 different representative localisations to cover the myocardium localised between: 1) the right ventricle and the septal myocardium, 2) the septal myocardium and left ventricle, 3) the left ventricle and lateral left ventricular myocardium and 4) the lateral left ventricular myocardium and surrounding epicardial tissue. To ensure exactly the same localisation for the different reconstructions and temporal averaging levels, the geometric coordinates of the measuring line were used for the different combinations: AIDR 3D without temporal averaging (A), AIDR 3D with temporal averaging (B), FBP without temporal averaging (C) and FBP with temporal averaging (D).