Figure 1

Long-window acquisition scheme. A conventional single-frame DIR acquisition is shown in a; the trigger delay (TD) is selected in order to place the acquisition window (blue box) in correspondence to the period of minimal cardiac motion. Simultaneously, a heart-dependent inversion time (TI) is prescribed in order to ensure data acquisition at the moment of optimal blood signal nulling. In b, the long window acquisition is shown. The acquisition window is prolonged and, during post-processing, sub-divided into multiple frames (orange boxes). Because of the golden angle trajectory, frames position (TD', red arrows) within the cardiac cycle, as well as frames duration (green arrows), can be freely selected. In order to compensate for high undersampling in shorter frames (c), image reconstruction is performed with k-t sparse SENSE.