Coronary Artery Center-Line Extraction Using Second Order Local Features

Figure 3

Different situations in finding the next point 𝑞^𝑘 on the semicircle scanning profile defined for the current point 𝑝^𝑖 and tracing direction 𝑢^𝑘 on a vessel segment. The small arrows indicate the direction fields estimated by the eigenvector of the Hessian matrix.