Table 1.

Dose constraints in 38-Gy relative biologic effectiveness.

Structure	Goal	Minor deviation	Major deviation
Rectum	V24 <35%	V24 <40%	V24 ≥40%
	V33.6 <10%	V33.6 <20%	V33.6 ≥20%
Bladder	V39 <8 cc	V39 <12 cc	V39 ≥12 cc
Femoral heads	V23 <1 cc	V23 <2 cc	V23 ≥2 cc
PTV	Min dose	99.5% >36.1 Gy
OTV	PTV coverage	95% to 38 Gy

Abbreviations: min, minimum; OTV, optimization target volume; PTV, planning tumor volume.