Table 1.

Treatment factor

Computed tomography	- Long time scan
	- 2.5 mm slice
Radiotherapy planning system	- Eclipse
	-Algorithm: Pencil beam convolution
	- Heterogeneity correction: Modified Batho Power Law
Targeting	- Observation of the tumor by fluoroscopy in advance
	- GTV + 0–5 mm = CTV, CTV + 5–10 mm = PTV
Irradiation field	- non-coplanar multi-dynamic arcs and/or multi-static beams
Prescription	- 48 Gy/4 fractions, 60 Gy/8 fractions, 60 Gy/15 fractions
	- Prescription for the iso-center
	- 6 MV - X ray
Radiation therapy equipment	- Clinac 23EX