The appearance of blood on magnetic resonance (MR) images is directly linked to its flowing nature. The contrast mechanism relies on the time-of-flight mechanism. In spin echo sequences, the excited blood flows out before the echo is created, resulting in black blood images, whereas in gradient echo images, the rapid succession of radiofrequency pulses saturates stationary signals, while fresh blood continuously flows in, leading to bright blood images. This phenomenon can be exploited to create inflow or time-of-flight angiography. It is also possible to encode the movement by using gradients that create phase differences between stationary and moving tissues. This technique, known as phase contrast angiography, can be used to image the venous and arterial phases separately. It also forms the basics of blood flow quantification. Finally, it is possible to use gadolinium-based agents to acquire contrast-enhanced angiographies.