Figure 1

(A). Mean post-void residual volume as a function of week of external beam radiation therapy (XRT) treatment, stratified by radiation group. The bladder scanner operates within a margin of accuracy of ± 20 cc. (B) Mean difference from baseline in post-void residual (PVR) volume as a function of week of external beam radiation therapy (XRT) treatment, stratified by radiation group. The best-fit lines were determined by quadratic regression analysis. The bladder scanner operates within a margin of accuracy of ± 20 cc.