Example of MRIs (T2 TSE) performed before (a) and after (b) injection of a hydrogel spacer. The respective plan in axial (c) and sagittal view (d) with 70 Gy (light orange) and 74 Gy (orange) isodoses shows the rectal sparing with the use of the hydrogel spacer. Prostate (red), tumor (white), rectum (blue) and hydrogel spacer (yellow, white shading in CT scans) are indicated. Abbreviation: TSE=Turbo spin echo.
Eckert et al. BMC Cancer 2013 13:27 doi:10.1186/1471-2407-13-27