Fig. 5

Axial dose distributions calculated from MC simulation for the proton beam. Dose distribution without the metal stent a, dose distributions calculated from the GB stent b and GI stent c placed at an angle of 0°, dose distributions calculated from the GB stent d and GI stent e placed at angle of 45°, and dose distributions calculated for the GB stent f and GI stent g placed at an angle of 90°