Flow patterns in the aortic root and the aorta studied with time-resolved, 3-dimensional, phase-contrast magnetic resonance imaging: implications for aortic valve-sparing surgery - Kvitting, J P; Ebbers, T; Wigström, L; Engvall, J; Olin, C L; Bolger, A F (J Thorac Cardiovasc Surg, 2004)