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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Updated: Jul 31, 2025

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Dosimetric and biologic intercomparison between electron and proton FLASH beams.

A Almeida1, M Togno2, P Ballesteros-Zebadua1,3

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This study compared electron (eFLASH) and proton (pFLASH) radiation therapy, finding both effectively control tumors and spare brain function. Immunological memory response was similar, independent of beam type or dose rate.

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Area of Science:

  • Radiation Oncology
  • Preclinical Research
  • Medical Physics

Background:

  • The FLASH effect, a radiotherapy technique using ultra-high dose rates, has shown promise in preclinical studies.
  • A direct comparison between electron (eFLASH) and proton (pFLASH) beams for the FLASH effect is lacking.

Approach:

  • Electrons and protons were delivered at both conventional and FLASH dose rates to preclinical models.
  • Dosimetric and biological outcomes, including tumor control and neurocognitive effects, were systematically compared.
  • Immunological memory response was assessed to evaluate long-term effects.

Key Points:

  • Both eFLASH and pFLASH demonstrated comparable tumor control and spared neurocognitive function in mice.
  • Conventional irradiation (eCONV, pCONV) resulted in cognitive deficits, unlike FLASH irradiation.
  • Tumor rejection rates were similar, indicating T-cell memory response is independent of beam type and dose rate.

Conclusions:

  • Dosimetric standards can be established for eFLASH and pFLASH, despite differences in temporal microstructure.
  • The overall exposure time is a critical factor for the FLASH effect in whole-body irradiation.
  • Electron and proton FLASH radiotherapy offer similar therapeutic benefits and immunological outcomes.