Observational Study
Copyright ©The Author(s) 2017.
World J Gastrointest Surg. Apr 27, 2017; 9(4): 103-108
Published online Apr 27, 2017. doi: 10.4240/wjgs.v9.i4.103
Figure 1
Figure 1 Favorable physical characteristics of proton radiotherapy are demonstrated. A: Charged particles such as protons travel a finite distance into tissue, as determined by their energy, and then release that energy within a tightly defined region called the “Bragg peak”; B: By delivering a range of energies toward the tumor target, several Bragg peaks can be formed to create a “spread-out Bragg peak” that conforms to the depth and position of the tumor target.