524 Imaging technical aspects

75±31 ml, p<0.01, respectively). (3) The %LV particles in patients with vortex was higher than that in patients without vortex (14% vs. 2%, medians, p<0.01). The %LV particles from right PVs was also higher than that from left PVs in patients with vortex (22% vs. 5%, p<0.01), whereas it did not differ in patients without vortex (2% vs. 0%, p=ns). Conclusions: 4D-Flow MRI can visualize the intra-LA vortex formation and flow dynamics from PVs to LV. The vortex formation may be dependent on the LV and LA volume, and may affect the flow dynamic from PVs to LV. The blood flow from left PVs seems to be more stagnant within LA than that from right PVs.