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RBE estimation of proton radiation fields using a DeltaE-E telescope.

Andrew Wroe1, Reinhard Schulte, Alberto Fazzi

  • 1Department of Radiation Medicine, Loma Linda University Medical Center, California 92354, USA. awroe@dominion.llumc.edu

Medical Physics
|November 26, 2009
PubMed
Summary

A novel silicon detector measures proton energy and lineal energy for hadron therapy. This technology estimates relative biological effectiveness (RBE) in proton beams, aiding treatment planning.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Detector Physics

Background:

  • Classical microdosimetry detectors offer 1D lineal energy data.
  • Hadron therapy requires precise characterization of radiation fields.
  • Accurate relative biological effectiveness (RBE) determination is crucial for treatment planning.

Purpose of the Study:

  • Evaluate a new monolithic silicon DeltaE-E telescope for 100 MeV proton beams.
  • Investigate the use of this telescope for determining RBE within proton Bragg peaks and spread-out Bragg peaks (SOBP).
  • Develop an RBE matrix linking detector output to RBE(alpha) in a polystyrene phantom.

Main Methods:

  • Utilized a monolithic silicon DeltaE-E telescope in unmodulated and modulated 100 MeV proton beams.
  • Collected coincident energy depositions in DeltaE and E stages for 2D information.
  • Developed an RBE matrix using in vitro V79 cell survival data.
  • Measured RBE(alpha) at various depths within a homogeneous polystyrene phantom.

Main Results:

  • The DeltaE-E telescope provides 2D information on lineal energy and particle energy.
  • RBE(alpha) increased from 4.04 proximally to a maximum of 5.4 at the distal edge of the SOBP.
  • The detector successfully linked output to RBE(alpha) at different phantom depths.

Conclusions:

  • The DeltaE-E telescope offers a compact and portable method for RBE estimation in hadron therapy.
  • Its high spatial resolution is valuable for biologically weighted hadron treatment planning.
  • This technology can assess RBE in rapidly changing radiation fields within phantoms.