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Internal target volume margins for a combined population
| Direction | Upper (cm) | Mid (cm) | Lower (cm) |
|---|---|---|---|
| n = 17 | n = 35 | n = 35 | |
| Anterior | 2.12 | 1.58 | 1.41 |
| Posterior | 2.12 | 1.00 | 1.16 |
| Left | 1.73 | 1.27 | 0.95 |
| Right | 2.12 | 1.38 | 1.15 |
Internal target volume margins based on our data are nonisotropic and vary per segment of rectum and sex.
