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. 2021 Oct 20;155(Suppl 1):28–44. doi: 10.1002/ijgo.13865

TABLE 3.

Field design for the pelvic radiotherapy

Field Border Landmark
AP‐PA fields Superior L4–5 vertebral interspace
Inferior 2 cm below the obturator foramen or 3 cm inferior to distal disease, whichever is lower
Lateral 1.5–2 cm lateral to the pelvic brim
Lateral fields Superior Same as AP‐PA field
Inferior Same as AP‐PA field
Anterior Anterior to the pubic symphysis
Posterior 0.5 cm posterior to the anterior border of the S2/3 vertebral junction. May include the entire sacrum to cover the disease extent