1. A method of analysis for an intravascular ultrasound (IVUS) image comprising: receiving an IVUS image; analyzing the IVUS image; determining an initial border of a region within the IVUS image based on the analysis of the IVUS image; receiving a user input indicating one or more control points, where each of the one or more control points is located inside or outside of the initial border; and determining a modified border of the region based on the analysis and the user input, the modified border passing through the one or more control points.