Hierarchic System Overview

The tumor recognition process solves two main problems: a) it finds candidate nodules and b) it classifies the candidate nodules. Both these problems are too complex to be solved in a single step, so they are hierarchically segmented into a series of subproblems. The subproblems chosen for the nodule finding problem are: 1. Find the lung regions, 2. Find small candidate nodule sites and any large tumors within the lung fields. 3. Find detailed boundaries to represent the candidate nodules from 2.