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. Author manuscript; available in PMC: 2024 Feb 15.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2016 Jan 23;95(1):505–516. doi: 10.1016/j.ijrobp.2016.01.036

Fig. 1.

Fig. 1.

Comparison of intensity modulated proton therapy (IMPT) versus passive scattering proton therapy (PSPT) and volumetric intensity modulated arc therapy (VMAT) in stage III non–small cell lung cancer. The IMPT plan achieves the best sparing of all critical structures. PSPT spares more of the heart and contralateral lung but not the esophagus ipsilateral lung, lung mean dose, or volume receiving a dose of 20 Gy or higher as compared with VMAT. Abbreviations: CTV = clinical target volume; GTV = gross tumor volume; PTV = planning target volume.