Table 4 Normal tissue avoidance for the IMRT and CRT plans in 12 patients, Ratio relative to a 4FB technique

IMRT – 6 field

Rectum

2.6 (1.1–168)

1.2 (0.4–16.4)

0.7 (0.4–1.5)

2.1 (0–134)

0.78^1,2 (0.48–0.98)

Bladder

10.7 (1.6–314)

1.0 (0.4–5.1)

0.7 (0.5–0.9)

2.9 (1.0–569)

0.81^1,2 (0.65–0.98)

IMRT – 8 field

Rectum

1.8 (0.1–166)

1.1 (0.6–9.5)

0.9 (0.6–1.5)

0.9 (0.1–208)

0.90^1,2 (0.61–1.06)

Bladder

7.1 (1.7–490)

1.0 (0.6–8.5)

0.8 (0.6–0.9)

0.8 (0–17)

0.78^1,2 (0.67–0.88)

CRT

Rectum

1.1 (0–71)

1.0 (0.4–12)

1.0 (0.3–1.3)

1.0 (0–1.8)

1.02 (0.61–1.3)

Bladder

7.8 (1.9–336)

0.55 (0.3–0.9)

0.87 (0.4–1.4)

1.1 (0–403)

0.96 (0.85–1.4)