Fig. 5From: Applications of various range shifters for proton pencil beam scanning radiotherapyComparison study for 110 MeV single proton spot with UPRS at different locations (indicated by the green boxes) in Eclipse TPS. a Planning geometry with 6 cm air gaps; b planning geometry with 33 cm air gaps. c the percent depth dose curves for 6 and 33 cm air gaps; the depth 0 cm corresponds to the entrance of the beam, which is the top surface of the first rectangular contour along beam direction (yellow dash line). d spot profiles at the phantom surface for 6 and 33 cm air gapsBack to article page