Fig 1.
Custom-made acrylic and support phantom.
Fig 2.
Experimental setup with the phantom and the support phantom.
Fig 3.
Plots of average doses of DR1 with FS6.3 on the surfaces of the end panel.
Calculated values at the 10 cm (a) and 17 cm (c) distances from the central axis as well as measured values at the 10 cm (b) and 17 cm (d) distances. G0, G30, and G330 indicate gantry angles of 0°, 30°, and 330°, respectively.
Table 1.
Average doses in the circles drawn around the point of the maximum dose at the end panels with a field size of 6.3 cm × 6.3 cm.
Table 2.
Areas of isodose lines of x% of the prescription dose (3 Gy) calculated from both the calculated and measured dose distributions at the end panels with a field size of 6.3 cm × 6.3 cm.
Fig 4.
Dose distributions of the air-electron stream calculated in TPS and measured with EBT3 film.
The dose distributions were acquired on the end panel with a field size of 6.3 cm × 6.3 cm, at a phantom angle of 30°, and at 17 cm distance from CAX. The unit of each legend is cGy and the numbers of x and y axes are pixel numbers (pixel size = 1.36 mm × 1.36 mm).
Fig 5.
Plots of average doses of DR1 with FS12.6 on the surfaces of the end panel.
Calculated values at the 10 cm (a) and 17 cm (c) distances from CAX as well as measured values at the 10 cm (b) and 17 cm (d) distances. G0, G30, and G330 indicate gantry angles of 0°, 30°, and 330°, respectively.
Table 3.
Average doses in the circles drawn around the point of the maximum dose at the end panels with a field size of 12.6 cm × 12.6 cm.
Table 4.
Areas of isodose lines of x% of the prescription dose (3 Gy) calculated from both the calculated and measured dose distributions at the end panels with a field size of 12.6 cm × 12.6 cm.
Fig 6.
Plots of average doses of DR1 with FS 6.3 on the surfaces of the front panel.
Calculated values at the 10 cm (a) and 17 cm (c) distances from CAX as well as measured values at the 10 cm (b) and 17 cm (d) distances. G0, G30, and G330 indicate gantry angles of 0°, 30°, and 330°, respectively.
Table 5.
Average doses in the circles drawn around the point of maximum dose at the front panels with a field size of 6.3 cm × 6.3 cm.
Table 6.
Areas of isodose lines of x% of the prescription dose (3 Gy) calculated from both the calculated and measured dose distributions at the front panels with a field size of 6.3 cm × 6.3 cm.
Fig 7.
Plots of average doses of DR1 with FS12.6 on the surfaces of the front panel.
Calculated values at the 10 cm (a) and 17 cm (c) distances from CAX as well as measured values at the 10 cm (b) and 17 cm (d) distances. G0, G30, and G330 indicate gantry angles of 0°, 30°, and 330°, respectively.
Table 7.
Average doses in the circles drawn around the point of the maximum dose at the front panels with a field size of 12.6 cm × 12.6 cm.
Table 8.
Areas of isodose lines of x% of the prescription dose (3 Gy) calculated from both the calculated and measured dose distributions at the front panels with a field size of 12.6 cm × 12.6 cm.
Fig 8.
Average percent differences between the values of DRx from the calculated and measured dose distributions.
The differences with a field size of 6.3 cm × 6.3 cm at 17 cm (a) and 10 cm (c) distances from CAX as well as those with a field size of 12.6 cm × 12.6 cm at 17 cm (b) and 10 cm (d) distances from CAX.
Fig 9.
Plots of values of DRx according to the projected areas on the front panels.
Plots of values of DR1 (a), DR2 (b), DR3 (c), and DR4 (d) on the front panels at the 10 cm distance from CAX according to the projected areas of the cross-section of the treatment beam at the phantom on the front panels. Plots of the values of DR1 (e), DR2 (f), DR3 (g), and DR4 (h) at the 17 cm distance from CAX according to the projected areas.
Fig 10.
Plots of values of DRx according to the projected areas on the end panels.
Plots of values of DR1 (a), DR2 (b), DR3 (c), and DR4 (d) on the end panels at 10 cm distance from CAX according to the projected areas of the cross-section of the treatment beam at the phantom on the end panels. Plots of the values of DR1 (e), DR2 (f), DR3 (g), and DR4 (h) at the 17 cm distance from CAX according to the projected areas.
Table 9.
Spearman’s rank correlations between the projected areas on the panels and the values of DRx.