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Updated: May 23, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
08:34

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Optimizing normal tissue sparing in ion therapy using calculated isoeffective dose for ion selection.

Nicholas B Remmes1, Michael G Herman, Jon J Kruse

  • 1Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA.

International Journal of Radiation Oncology, Biology, Physics
|March 23, 2012
PubMed
Summary
This summary is machine-generated.

The best ion type for radiation therapy depends on the specific tumor and normal tissue radiosensitivities. Heavier ions are better for low alpha/beta ratio tumors, while protons are better for high alpha/beta ratio tumors.

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Area of Science:

  • Medical physics
  • Radiation oncology
  • Biophysical modeling

Background:

  • Ion beam radiation therapy offers potential advantages over traditional photon therapy.
  • The biological effectiveness of ion beams depends on the ion type and tissue radiosensitivity (α/β ratio).
  • Understanding isoeffective dose is crucial for optimizing treatment plans and sparing normal tissues.

Purpose of the Study:

  • To evaluate how different ion types influence the isoeffective dose delivered to surrounding normal tissues.
  • To investigate this effect as a function of normal and target tissue α/β ratios.

Main Methods:

  • Incorporated a microdosimetric biological dose model into Geant4 simulations.
  • Simulated parallel opposed beams of protons, helium, lithium, beryllium, carbon, and neon ions.
  • Calculated normal tissue isoeffective doses for various ion types and α/β ratios.

Main Results:

  • The optimal ion type for normal tissue sparing is highly dependent on both normal and target tissue α/β ratios.
  • For carbon ions, normal tissue isoeffective dose varied by nearly a factor of 5 based on α/β ratios.
  • Results showed variations from 2x less to 2x greater than proton isoeffective doses.

Conclusions:

  • No single ion type is universally optimal for all treatment scenarios.
  • Heavier ions are superior when target tissue α/β is low and normal tissue α/β is high.
  • Protons are superior in the opposite scenario; lithium and beryllium show promise similar to carbon.