Decreasing the Dose to the Rectal Wall by Using a Rectal Retractor during Radiotherapy of Prostate Cancer: A Comparative Treatment Planning Study

Figure 5

A schematic illustration of the impact of the rectal retractor on the rectal wall in the ideal case, where the situation is shown without the retractor (a) and with the retractor (b). The brown area indicates the rectal wall and the grey circle represents the rectal retractor.