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Low-Z target optimization for spatial resolution improvement in megavoltage imaging.

Tanner Connell1, James L Robar

  • 1Medical Physics Unit, McGill University Health Center, 1650 Avenue Cedar, Montreal, Quebec H3G 1A4, Canada. tconnell@dal.ca

Medical Physics
|February 24, 2010
PubMed
Summary

Low atomic number (Z) targets improve spatial resolution in medical imaging. Custom low-Z targets integrated into linear accelerators produce high-resolution images comparable to clinical beams.

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Area of Science:

  • Medical Physics
  • Radiotherapy Imaging
  • Radiation Oncology

Background:

  • Previous studies demonstrated contrast enhancement in megavoltage imaging using low atomic number (Z) targets.
  • This research expands on prior work by examining beam production parameters affecting spatial resolution.

Purpose of the Study:

  • Investigate the impact of target atomic number, thickness, and electron energy on spatial resolution.
  • Evaluate the performance of custom low-Z targets in a radiotherapy linear accelerator.
  • Compare image quality from custom targets to the clinical 6 MV beam.

Main Methods:

  • Employed beryllium, aluminum, and tungsten targets with varying thicknesses (10%-100% CSDA range).
  • Utilized incident electron energies of 4.5 and 7.0 MeV.

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  • Conducted Monte Carlo simulations and experimental comparisons.

    • Main Results:

    • Thinner targets and higher electron energies generally yielded better modulation transfer function (MTF) curves.
    • Low-Z targets produced superior MTF curves due to detector system photon energy dependence.
    • Simulations indicated increased f50 values when custom targets were moved to the clinical target location.
    • f50 values for custom targets ranged from 10.4% lower to 15.5% higher than the clinical 6 MV beam.

    Conclusions:

    • Successfully integrated low-Z external targets into a medical linear accelerator with minimal modifications.
    • Achieved high-resolution imaging, comparable or superior to the clinical 6 MV beam, using external low-Z targets.