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Table 1 Treatment factor

From: Prognostic factors for local control of stage I non-small cell lung cancer in stereotactic radiotherapy: a retrospective analysis

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