Fig. 2
From: Characteristics of non-coplanar IMRT in the presence of target-embedded organs at risk
PTV-OAR topologies used in the study. Shown are for each OAR shape ball (A), cylinder with rounded ends (B), banana (C): three orthogonal planes through the phantom center and a perspective view of the green OAR embedded in the transparent red PTV. The OAR in B, C has inferior (I) - superior (S) orientation, with its longer dimension parallel to the table (white arrow). Brown line shows the phantom surface