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. 2011 Nov;84(1007):967–996. doi: 10.1259/bjr/22373346

Figure 1.

Figure 1

Example of dose distributions in (a,b) IMRT and (c,d) VMAT plans for radiotherapy to prostate (primary planning target volume (PTV)) and pelvic lymph nodes (elective PTV). The dose prescribed to the primary PTV and elective PTV is 74 Gy and 55 Gy in 37 fractions, respectively. The primary PTV (red contour) is encompassed by the 95% isodose (orange line and colour wash) and the elective PTV (pink contour) is encompassed by the 70.6% isodose (dark blue line and light green colour wash). Some sparing of the rectum (brown contour) and bladder (yellow contour) is achieved. Figures courtesy of Department of Medical Physics, Royal Surrey County Hospital, UK.