Radial distribution of vascular fraction and tumor cell density in the investigated virtual tumors prior to irradiation.

<p>Left axis: homogeneous (o) and inhomogeneous (.) tumor cell density distributions, <i>ρ</i>. Right axis: homogeneous (*) and inhomogeneous (□) vascular fraction distributions, vf. Each tumor consist of a combination of one vf and <i>ρ</i> profiles (see text for details).