Figure 4.

SVD captures from a cardiac MRI movie the time courses of breathing, diastole, and systole from a “four-chamber” angle of view. (A) PC1 represents respiration is shown. PC2 tracks the oscillation between diastole and systole. (B) This frame in the reconstructed PC2 movie is during diastole with the open cavities especially evident in the ventricles (Movie S2). (C) In this frame from the same movie, all four chambers are contracted (systole). RA is right atrium; RV is right ventricle; LV is left ventricle; and LA is left atrium. To see this figure in color, go online.