Generalized multi-energy model for computing radiation treatment parameters on image domain and automated model-selection framework

Figure 2 The training data three (3) and four (4) group regions. A: Tissues were classified into lung tissues, soft tissues and bone tissues contained in left, middle and right region, respectively; B: This is four (4) region classification that divided the middle region from the previous three (3) regions into two regions. This divides the soft tissues into two more classes. ρ_e: Relative electron density.