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Rotating the proton beam continuously around the patient instead of firing from a few fixed angles, to spread the entrance dose and sharpen the target dose.
Proton arc spreads low-weight spots across a continuously rotating gantry, so each direction contributes only part of the dose, improving conformality and robustness to range uncertainty. Vendors have released treatment-planning implementations and first patients have been reported at a small number of centres; a September 2026 search of ClinicalTrials.gov found no randomised comparison against intensity-modulated proton therapy. Delivery time and quality assurance are the practical barriers.
Spot-scanned protons are delivered during continuous gantry rotation, with energy layers distributed across angles so each direction contributes only part of the dose.
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Query for this technology: (TITLE:"Proton arc therapy" OR ABSTRACT:"Proton arc therapy") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about Proton arc therapy, not a curated reading list.
Shares Pencil-beam scanning and intensity-modulated proton therapy, Varian (Siemens Healthineers), Proton therapy machines: cyclotrons, synchrotrons and single-room systems, Radiotherapy roadmap: X-rays → shaped beams → fewer fractions, particles and FLASH and the tag frontier.
Shares Radical oncology: what could change the war by 2035, IMRT / IGRT (modern external beam) and the tag frontier.
Shares Radical oncology: what could change the war by 2035, IMRT / IGRT (modern external beam) and the tag frontier.
Shares Radical oncology: what could change the war by 2035 and the tag frontier.
Shares Radical oncology: what could change the war by 2035 and the tag frontier.
Shares Radical oncology: what could change the war by 2035 and the tag frontier.
Shares Radical oncology: what could change the war by 2035 and the tag frontier.
Shares Radical oncology: what could change the war by 2035 and the tag frontier.