Evaluation of blood flow energy loss before and after endovascular aneurysm repair using 4D Flow MRI

Motivation: To survey blood flow alteration after EVAR using 4D Flow MRI. Goal(s): To reveal how the degree of energy loss occur, and how interact with other parameters. Approach: Velocity, volume, reflux ratio, and degree of energy loss at proximal and within the treatment segment were analyzed. Each value gained pre and post EVAR were statistically compared, and the relation between energy loss and pulse wave velocity were evaluated. Results: After EVAR, the antegrade velocity and the volume increased at the aneurysmal orifice level, and the degree of energy loss through the treatment segment increased. Impact: EVAR facilitates aortic stiffness and increases the antegrade velocity and volume at treatment area. These alterations were considered as the main factors promoting further energy loss, which may concern with cardiac afterload.