1. A processor-based method of displaying an angiographic and an intravascular representation of a blood vessel comprising: generating a set of optical coherence tomography image data in response to distance measurements of the blood vessel obtained during a pullback of a probe through the blood vessel using an optical coherence tomography system, the set of optical coherence tomography image data comprising a plurality of cross-sectional image at a plurality of positions along the blood vessel; generating a set of angiography image data using an angiography system during the pullback of the probe through the blood vessel using an optical coherence tomography system, the set of angiography image data comprising a plurality of two-dimensional images obtained at different points in time during the pullback; displaying, on a graphical user interface, a first panel comprising a first longitudinal view of the blood vessel generated using the optical coherence tomography image data; and displaying, on a graphical user interface, a second panel comprising a frame of the angiography image data identifying the blood vessel using one or more points in the frame and a vessel centerline passing through the one or more points.