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VDA visualization of atrial septal defects in a porcine model in two animals: Before the ASD is created (left two columns) the virtual bolus is seen in the left side of the heart (pulmonary veins, left atrium and Aorta). After the ASD is created (right two columns) the virtual bolus moves through the ASD into the right atrium and is seen in the right ventricular outflow tract.
