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About

Philip Blumenfeld is a leading figure in the advancement of gantry-less proton therapy, with a focused expertise in upright patient positioning for head and neck and brain malignancies. His major contributions center on demonstrating the clinical feasibility and reproducibility of treating patients in a seated or upright position using fixed-beam proton systems, a paradigm shift that eliminates the need for costly rotating gantries. His most-cited work, a 2024 study on upright positioning reproducibility in image-guided proton therapy for head and neck cancers (10 citations), established critical benchmarks for clinical accuracy. This was complemented by his detailed commissioning of a novel gantry-less synchrotron-based system (9 citations), which described the system’s unique ability to deliver protons across a 4–38 cm water-equivalent range using 1,800 energy layers. Blumenfeld’s ongoing impact is underscored by his 2025 prospective clinical trial (3 citations), which evaluates the safety and preliminary efficacy of upright image-guided proton therapy for recurrent head and neck and brain tumors. By pioneering these techniques, he is expanding access to precise, cost-effective proton therapy and reshaping the future of radiation oncology.