Fig. 2. Radiation dose distribution according to radiation therapy (RT) techniques. Axial views of (A) 3-dimentional conformal RT; (B) volumetric arc therapy; (C) proton beam therapy (PBT) with passive scattering; (D) PBT with pencil-beam scanning technique. X-ray RT (A, B) results in low dose spread in wide area outside the target lesion which are not shown in the PBT plans (C, D).

Int J Gastrointest Interv 2021;10:175~182 https://doi.org/10.18528/ijgii210043

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