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