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Fig. 3D. —44-year-old man with corrected coarctation (not shown) and
bicuspid aortic valve. Phase-contrast study was obtained in oblique axial
plane above aortic valve. Magnitude image (C on right), velocity
encoded image (C on left), and resulting graph (D) of blood flow
during single R-R interval show large systolic flow (delineated by graph below
zero line) and slower diastolic flow in opposite direction (delineated by
graph above zero line), indicating aortic valve regurgitation. Relationship
between graph areas below and above zero enables quantification of
regurgitation.
