Dose Planning Evaluation of Intensity-Modulated Proton Therapy (IMPT) Technique Based on In-House Dynamic Thorax Phantom

One of the drawbacks Intensity Modulated Radiation Therapy (IMRT) technique is that absorbed dose in healthy tissue relatively high. Proton beam has characteristics can compensate for these drawbacks. The Bragg peak characteristic a proton allows administration high radiation doses to target organ only. Non-Small Cell Lung Cancer (NSCLC) cases are located vicinity many vital organs, so exceed certain limit will have significant impact on organs. heavy particle exhibits interaction patterns with heterogeneity differ from photon. This study aims determine distribution planning NSCLC (IMPT) and compare its effectiveness IMRT technique. Treatment was done by using TPS Eclipse water phantom in-house thorax dynamic phantom. parameters used one field at 0° three fields 45°, 135°, 225°. In this study, single, sum, multiple techniques were used. evaluation performed calculating Conformity Index (CI), Homogeneity (HI), Gradient (GI) each treatment planning. As result, bit difference CI HI values shown between IMPT GI range 4.15-4.53, while value 7.89. histogram results planar show provides fewer off-target than Evaluation also carried out organs five areas interest four OAR positions. then compared measurement data. point did not significantly. However, positions nearly zero, which had large