Virtual dye angiography uses volume selective-saturation pulses to saturated blood signal locally. The difference images between saturation off/on (black and white images) are used to produce a color-flow map. Ao, aorta; LA, left atrium; LV, left ventricle. (From George AK, Faranesh AZ, Ratnayaka K, et al. Virtual dye angiography: flow visualization for MRI-guided interventions. Magn Reson Med 2012;67(4):1013–21; with permission.)