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Copyright ©The Author(s) 2015.
World J Gastrointest Oncol. Sep 15, 2015; 7(9): 141-147
Published online Sep 15, 2015. doi: 10.4251/wjgo.v7.i9.141
Figure 2
Figure 2 With X-rays, the tumor dose is significantly less than the entry dose and exit dose is delivered beyond the tumor target. With conventional radiotherapy (A) using X-rays (photons), the highest dose is near the point of beam entry into the patient. The tumor dose is significantly less than the entry dose. Also, an exit dose is delivered beyond the tumor target. With protons (B) and other particle therapies, such as carbon ions, the entry dose is low. The highest dose is at the depth of the tumor target and there is no exit dose beyond the target. Image borrowed from the University of Florida Health Proton Therapy Institute.