Table 1.

Optimization parameters in Eclipse

Structure	Constraint type	Vol (%)	Dose (Gy)	Priority
GTV	Superior	0	PD + 8	150
	Inferior	98	PD	200
C1	Superior	0	PD + 8	150
	Inferior	98	PD + 2	200
C2	Superior	0	PD + 8	150
	Inferior	98	PD + 4	200
C3	Superior	0	PD + 8	150
	Inferior	98	PD + 6	200
GTV–C1	Superior	0	PD + 3	100
C1–C2	Superior	0	PD + 5	100
C2–C3	Superior	0	PD + 7	100
Normal tissue	Superior	RefDA10	10	300
	Superior	RefDA12	12	300

PD — the prescribed dose, taken from the dynamic conformal arcs (DA) plan of this case, similarly the V₁₀ (RefDA10) and V₁₂ (RefDA12) values for normal tissue; GTV — gross tumour volume