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- FIGURE 66-11B. Dose-volume histograms for the rectum wall for four
- 15-MV, 86-Gy prescription dose, nine-beam intensity-modulated plans.
- For plan A, margins were set to zero, and the scattered radiation
- effects were ignored. For plan B, a lateral margin of 5 mm and
- superior or inferior margins of 7.5 mm, chosen based on our practice
- for standard 3D conformal radiation treatments, were used, but
- scattered radiation was still ignored. For plan C, the margins were
- set to zero, but the scattered radiation was taken into account. For
- plan D, smaller margins of 3 mm laterally, superiorly, and inferiorly
- were used, and scattered radiation was included. Based on target-dose
- homogeneity and rectum protection, plan A appears to be the worst and
- plan D the best.
-