# Compact FLASH and proton systems at the price of a conventional linac

Source: https://onco.cc/ideas/idea-moon-compact-flash-proton/  
OnCo record `idea-moon-compact-flash-proton` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Ultra-fast FLASH radiotherapy and proton beams may spare healthy tissue dramatically, but the machines cost tens of millions. Engineer versions that any hospital can afford.

## Summary

FLASH radiotherapy (dose delivered in under a second) reduces normal tissue toxicity in animal models with preserved tumour control and has entered early human trials; proton therapy spares normal tissue by physics but costs an order of magnitude more than photon systems. Compact accelerator concepts (very-high-energy electrons, laser-driven and superconducting compact proton sources) could lower cost. The proposal is a focused engineering programme, with milestone funding, to deliver a compact system capable of FLASH-rate delivery at a capital cost comparable to a conventional linac, paired with the clinical trials needed to establish the FLASH effect in humans.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: A compact system delivers FLASH-rate treatment at conventional linac cost within eight years, and randomised trials confirm reduced late toxicity at equal tumour control in at least one indication.
- Rationale: Toxicity from radiotherapy limits dose and quality of life; if the FLASH effect holds in humans, cost is the only barrier to universal benefit, and accelerator physics is advancing quickly.
- Proposed test: Prototype within four years with dosimetric validation; first randomised FLASH versus conventional trial in a toxicity-limited indication such as head and neck or paediatric tumours.
- Maturity: preclinical-evidence
- Actor: industry

## Sources

- Bottleneck evidence (Surgery and radiotherapy cure most, get least): Sullivan et al., Global cancer surgery (Lancet Oncology Commission 2015): https://doi.org/10.1016/S1470-2045(15)00223-5

## Connected records

- technologies: [FLASH radiotherapy](https://onco.cc/technologies/flash-rt/), [Proton therapy](https://onco.cc/technologies/proton-therapy/)
- companies: [IBA (Ion Beam Applications)](https://onco.cc/companies/iba/), [Mevion Medical Systems](https://onco.cc/companies/mevion/), [Varian (Siemens Healthineers)](https://onco.cc/companies/varian/)
- bottlenecks: [Surgery and radiotherapy cure most, get least](https://onco.cc/bottlenecks/b-surgery-radiation-innovation/), [Toxicity and quality of life are undervalued](https://onco.cc/bottlenecks/b-toxicity-qol/)
- key papers: [Global cancer surgery: delivering safe, affordable, and timely cancer surgery](https://onco.cc/key-papers/paper-sullivan-lancet-oncol/)

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