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Illustration of three main imaging technologies used to capture information on blood flow. (a) 2D Doppler echocardiography is widely used in the clinic; (b) 3D flow reconstructed in an infant with mitral stenosis using registration of multiple 3D Doppler acquisitions (Gómez et al., 2013) (c) Phase-contrast MRI, also known as 4D flow data, colour coded by the pressure maps computed from blood flow velocity data (Krittian et al., 2012) in a chronic dissection case.
