Table 3: Techniques used for the external beam pelvic radiotherapy.


Type of field4-field box technique
Radiation quality6–50 MV (linear accelerators)
Dose per fraction1.8–2.0 Gy
Number of fractions23 (median) (range 5–26)
Total dose46.0 Gy (median) (range 6–50 Gy)
FractionationDaily fractions, 5 fractions per week
Superior field borderL5-S1 disk
Inferior field borderLower margin of the fossa obturatoria
Lateral borders1 cm lateral of the linea terminals