Alternative anatomical borders of blood vessels and associated devices systems and methods

A blood vessel border identification system, comprising:

• an intravascular imaging catheter configured to obtain an intravascular image of a blood vessel of a patient while the intravascular imaging catheter is positioned inside the blood vessel;
• a processing unit configured for communication with the intravascular imaging catheter, a user input device, and a user display, wherein the processing unit is configured to:
• receive the intravascular image of the blood vessel;
• perform an analysis of the intravascular image of the blood vessel to identify a plurality of candidate borders of the blood vessel, wherein the plurality of candidate borders comprises a primary candidate border and an alternative candidate border, wherein the primary candidate border and alternative candidate border represent candidates for a single circumference of the blood vessel;
• output, to the user display, a first graphical interface comprising:
• the intravascular image of the blood vessel;
• the primary candidate border overlaid on the intravascular image of the blood vessel;
• and
• a user input selector proximate to the intravascular image of the blood vessel;
• receive, via the user input device, a selection of the user input selector;
• and
• output, in response to the selection, a second graphical interface to the user display, wherein the second graphical interface comprises:
• the intravascular image of the blood vessel;
• the alternative candidate border overlaid on the intravascular image of the blood vessel;
• and
• the user input selector proximate to the intravascular image of the blood vessel,
• wherein the primary candidate border is visually displayed in a first manner in the first graphical interface and the alternative candidate border is visually displayed in a different, second manner in the second graphical interface.