Figure 2
Irradiation geometries. (a) Full single-scan modality; (b) half step-scan modality; (c) full step-scan modality. The yellow areas indicate the area irradiated by the incident X-ray beam on the surface of the cylindrical phantom. Shown in (d), (e), (f) are the positions of the radiochromic film positioned all around the surface of the cylinder, at the midplane and at the isocentre without the phantom, respectively. |