Fig. 3
Diagram demonstrating the sequential steps involved in defining "areas at risk". Sagittal (a) and axial (b) TRUS images of CTVHR and OARs contours performed by four different radiation oncologists. CTVHR (blue), bladder (yellow), vagina (pink), rectum (brown). Sagittal (c) and axial (d) TRUS images representing the encompassing CTVHR (light-blue colour) with a 1 cm expansion (red colour). Definition of the “area at risk” by the intersection of the 1 cm-expansion volume with bladder, rectum and vagina contour (Figures e and f). * The area at risk was defined with identical methodology in TRUS and MR images