System and method for instant and automatic border detection

A system comprising:

• an imaging catheter configured to obtain imaging data for a plurality of cross-sectional image frames of a vessel comprising a vessel wall, wherein each of the plurality of cross-sectional image frames is a two-dimensional image frame;
• a navigational controller configured to be operated by a user, wherein the navigational controller is configured to provide a plurality of navigational inputs without a hand of the user being removed from the navigational controller, wherein the plurality of navigational inputs is configured for navigating to a first cross-sectional image frame and to a second cross-sectional image frame;
• a processing system operably coupled to the imaging catheter, wherein the processing system comprises a processor coupled to a memory;
• and
• a display device in communication with the processor,
• wherein, in response to the plurality of navigational inputs, the processor is configured to detect a first outline of the vessel wall border for the first cross-sectional image frame and a second outline of the vessel wall border for the second cross-sectional image frame,
• wherein the processor is further configured to display, using the display device, the first cross-sectional image frame with the first outline of the vessel wall border overlaid thereon and the second cross-sectional image frame with the second outline of the vessel wall border overlaid thereon.